Federal Motor Vehicle Safety Standards; Electric-Powered Vehicles: Electrolyte Spillage and Electrical Shock Protection, 57260-57273 [E7-19735]
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Federal Register / Vol. 72, No. 194 / Tuesday, October 9, 2007 / Proposed Rules
under Executive Order 12866 (58 FR
51735, October 4, 1993).
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This rule does not impose an
information collection burden under the
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Executive Order 13132 (64 FR 43255,
August 10, 1999) does not apply to this
rule because it will not have federalism
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and Coordination With Indian Tribal
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8. Executive Order 13211: Actions That
Significantly Affect Energy Supply,
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This rule is not subject to Executive
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regulatory action as defined in
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EPA approves State programs as long
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the requirements of section 12(d) of the
National Technology Transfer and
Advancement Act of 1995 (15 U.S.C.
272 note) do not apply to this rule.
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As required by section 3 of Executive
Order 12988 (61 FR 4729, February 7,
1996), in issuing this rule, EPA has
taken the necessary steps to eliminate
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legal standard for affected conduct.
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of Risk and Avoidance of Unanticipated
Takings
EPA has complied with Executive
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1988) by examining the takings
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Unanticipated Takings issued under the
executive order.
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and Safety Risks
12. Executive Order 12898: Federal
Actions to Address Environmental
Justice in Minority Populations and Low
Income Populations
Because this rule proposes
authorization of pre-existing state rules
and imposes no additional requirements
beyond those imposed by state law and
there are no anticipated significant
adverse human health or environmental
effects, the rule is not subject to
Executive Order 12898 (59 FR 7629,
February 16, 1994).
This rule is not subject to Executive
Order 13045 (62 FR 19885, April 23,
1997), because it is not economically
significant as defined in Executive
Order 12866 and because the EPA does
not have reason to believe the
environmental health or safety risks
addressed by this action present a
disproportionate risk to children.
List of Subjects in 40 CFR Part 271
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Administrative practice and procedure,
Confidential business information,
Hazardous materials transportation,
Hazardous waste, Indian-lands,
Intergovernmental relations, Penalties,
Reporting and recordkeeping
requirements.
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Dated: September 26, 2007.
Bharat Mathur,
Acting Regional Administrator, Region 5.
[FR Doc. E7–19634 Filed 10–5–07; 8:45 am]
DEPARTMENT OF TRANSPORTATION
National Highway Traffic Safety
Administration
49 CFR Part 571
[Docket No. NHTSA–2007–28517]
RIN 2127–AK05
Federal Motor Vehicle Safety
Standards; Electric-Powered Vehicles:
Electrolyte Spillage and Electrical
Shock Protection
National Highway Traffic
Safety Administration (NHTSA),
Department of Transportation (DOT).
ACTION: Notice of proposed rulemaking
(NPRM).
AGENCY:
SUMMARY: Based on concern that the
agency’s standard on electric-powered
vehicles, as currently written, may
inadvertently hinder the development of
fuel cell vehicles in the United States,
NHTSA is proposing to amend the
electrical safety requirements of Federal
Motor Vehicle Safety Standard (FMVSS)
No. 305, Electric-powered vehicles:
electrolyte spillage and electrical shock
protection. The amendment would
ensure that state-of-the-art fuel cell
vehicles (FCVs) are consistent with the
interests of safety and encompassed by
FMVSS No. 305 so that the market may
continue to develop. This NPRM also
proposes to harmonize FMVSS No. 305
with the revised FMVSS No. 301, as
regards rear moving barrier impact test
conditions. This rulemaking
commenced in response to a petition
from the Alliance of Automobile
Manufacturers.
You should submit your
comments early enough to ensure that
Docket Management receives them not
later than December 10, 2007. Proposed
effective date of final rule: assuming
that a final rule is issued, NHTSA
proposes that the changes adopted by
the rule would be mandatory for fuel
cell vehicles manufactured on or after
exactly one year from the date of
publication of the final rule in the
Federal Register, with optional early
compliance.
DATES:
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Federal Register / Vol. 72, No. 194 / Tuesday, October 9, 2007 / Proposed Rules
You may submit comments
[identified by DOT Docket ID Number
NHTSA–2007–28517] by any of the
following methods:
• Federal eRulemaking Portal: Go to
https://www.regulations.gov. Follow the
online instructions for submitting
comments.
• Mail: Docket Management Facility:
U.S. Department of Transportation, 1200
New Jersey Avenue, SE., West Building
Ground Floor, Room W12–140,
Washington, DC 20590–0001.
• Hand Delivery or Courier: West
Building Ground Floor, Room W12–140,
1200 New Jersey Avenue, SE., between
9 a.m. and 5 p.m. ET, Monday through
Friday, except Federal holidays.
• Fax: 202–493–2251.
Instructions: For detailed instructions
on submitting comments and additional
information on the rulemaking process,
see the Public Participation heading of
the Supplementary Information section
of this document. Note that all
comments received will be posted
without change to https://
www.regulations.gov, including any
personal information provided. Please
see the Privacy Act heading below.
Privacy Act: Anyone is able to search
the electronic form of all comments
received into any of our dockets by the
name of the individual submitting the
comment (or signing the comment, if
submitted on behalf of an association,
business, labor union, etc.). You may
review DOT’s complete Privacy Act
Statement in the Federal Register
published on April 11, 2000 (65 FR
19477–78) or you may visit https://
DocketInfo.dot.gov.
Docket: For access to the docket to
read background documents or
comments received, go to https://
www.regulations.gov or the street
address listed above. Follow the online
instructions for accessing the dockets.
FOR FURTHER INFORMATION CONTACT: For
technical issues, you may call Mr.
Charles Hott, Office of Rulemaking
(Telephone: 202–366–0247) (Fax: 202–
493–2990). For legal issues, you may
call Ms. Rebecca Schade, Office of Chief
Counsel (Telephone: 202–366–2992)
(Fax: 202–366–3820). You may send
mail to these officials at National
Highway Traffic Safety Administration,
U.S. Department of Transportation, 1200
New Jersey Avenue, SE., West Building,
Washington, DC 20590.
SUPPLEMENTARY INFORMATION:
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ADDRESSES:
Table of Contents
I. Background
II. Petitioner’s Suggested Changes; NHTSA’s
Decisions on the Petition
A. Fuel cell vehicles and FMVSS No. 305’s
isolation requirement
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B. Test Procedure Measurement Values
C. Test Procedure Measurement Location
on the Vehicle
D. Setting 0.2 Joules as an Appropriate Low
Energy Threshold
E. Harmonizing FMVSS No. 305’s Rear
Impact Test Procedure with FMVSS No.
301
III. International Harmonization
IV. The Proposed Rule
V. Benefits/Costs
VI. Public Participation
VII. Rulemaking Analyses and Notices
I. Background
Vehicles that use electricity as
propulsion power can contain high
voltage systems operating with several
hundred volts at a time, as compared to
conventional petroleum-powered
vehicles, which usually contain only a
12-volt battery to power accessories like
headlights, radios, and so forth. Thus,
electric vehicles potentially pose
electrical risks not posed by
conventional petroleum-powered
vehicles. During a crash, NHTSA
requires electric vehicles to limit
electrolyte spillage, retain energy
storage devices, and maintain isolation
between the vehicle’s chassis and highvoltage system (49 Code of Federal
Regulations (CFR) Part 571.305,
‘‘Electric-powered vehicles: electrolyte
spillage and electrical shock
protection;’’ also referred to as Federal
Motor Vehicle Safety Standard (FMVSS)
No. 305). Maintaining electrical
isolation ensures that the high voltage
system does not use the chassis itself to
complete (or close) the circuit. This
makes it less likely that a human or
other object could touch the chassis and
become part of the circuit, allowing
electrical current to flow through them.
FMVSS No. 305 is intended to protect
occupants, rescue workers, or others
who may come in contact with the
vehicle after a crash from electrical
shock hazards, by ensuring isolation of
the vehicle’s high voltage battery
electrical system.
FMVSS No. 305 was originally drafted
based on a voluntary consensus
standard, the Society of Automotive
Engineers (SAE) Recommended Practice
for Electric and Hybrid Electric Vehicle
Battery Systems Crash Integrity Testing
(SAE J1766). SAE J1766 was first issued
in 1996 and most recently updated in
April 2005 in order to accommodate
fuel cell vehicles (FCVs), based on
concerns that SAE J1766 and FMVSS
No. 305’s electrical isolation
requirements had not considered FCVs
when they were originally developed.1
1 FMVSS No. 305 currently contains a 500 ohms/
volt electrical isolation requirement, with isolation
measured between the high voltage propulsion
battery and the chassis. FCVs are designed with
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In order to bring FMVSS No. 305 back
into line with the updates to SAE J1766,
the Alliance of Automobile
Manufacturers (‘‘the Alliance’’)
petitioned NHTSA to conduct
rulemaking to amend the requirements
of FMVSS No. 305 so that FCV
manufacturers would know the
performance requirements required to
comply with the FMVSSs and so that
FCV development could proceed
without hindrance. NHTSA is issuing
this NPRM in order to promote our
national policy goal of developing the
hydrogen FCV market consistent with
the interests of safety. The agency
anticipates that current state-of-the-art
FCVs, whether they contain AC or DC
high voltage systems, will be able to
meet the requirements of this proposed
rule with virtually no design changes
necessary.
II. Petitioner’s Suggested Changes;
NHTSA’s Decisions on the Petition
In this section, the preamble sets forth
the petition’s many suggested changes
to FMVSS No. 305’s requirements.
These are marked in bullet format, and
are followed by NHTSA’s response to
each suggested change. As will be
discussed, NHTSA generally tentatively
agrees with most of the petitioner’s
suggestions. To the extent the agency
does not agree, the reasons for
disagreeing are explained.
NHTSA generally concurs with the
petitioner’s suggested amendments to
FMVSS No. 305’s requirements (except
as noted) because the agency tentatively
concludes that the changes would
achieve the policy objective of aiding
the development of the hydrogen FCV
market consistent with the interests of
safety. NHTSA agrees with the
petitioner that not undertaking
rulemaking could potentially interfere
with development of the FCV market, as
FCV manufacturers are currently
uncertain of how to test electrical
isolation in FCVs with liquid coolant
loops.2 An additional benefit of this
coolant loops to cool down very hot fuel cells
during operation, and the coolant tends to become
more conductive of electrical current over time, and
able to convey electrical current to the vehicle
chassis; i.e., the conductivity of the coolant causes
the vehicle to be unable to maintain electrical
isolation.
2 Under the current FMVSS No. 305, electrical
isolation is measured only between the high voltage
propulsion battery and the chassis, and functionally
often ends up not being measured, because there is
typically no voltage to be found downstream of the
contactors that disconnect high voltage from the
battery in the event of a crash. The proposed
FMVSS No. 305 would measure electrical isolation
between all high voltage sources and the chassis,
clarifying vehicle manufacturers’ obligations in
terms of ensuring electrical isolation.
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rulemaking becoming final would be
closer harmonization with international
and voluntary industry consensus
standards.
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A. Fuel Cell Vehicles and FMVSS No.
305’s Isolation Requirement
FMVSS No. 305 currently requires an
electrical isolation of 500 ohms/volt.3
That isolation must be maintained
between the vehicle’s propulsion battery
and chassis after frontal, side, and rear
crash tests, and was based upon the
shock hazard for alternating current
(AC). The standard does not distinguish
between AC and DC (direct current)
types of electrical current. Also, the
standard calculates isolation values
using voltage readings only between the
propulsion battery and the chassis, and
not from other potential high voltage
sources that may cause a shock hazard,
such as fuel cells. Fuel cells and
converters that change DC electrical
current into AC to supply propulsion
motors used in some electric-motor
vehicle designs are not currently
required to maintain electrical isolation
from the chassis.
• The petitioner states that the
current 500 ohms/volt isolation
requirement of FMVSS No. 305’s
paragraph S5.3 is not achievable for
state-of-the-art FCVs, because they
require a liquid coolant to dissipate the
heat generated in the fuel cell, and the
coolant itself is unavoidably an
electrical conductor.4 The petitioner
argues that the updated SAE J1766
allowance for an isolation level of 100
ohms/volt under certain defined
conditions does not lower the level of
safety currently provided by FMVSS No.
305, because it is well within the range
of safety for DC current, and because the
provision ‘‘* * * is directly tied to a
requirement to continuously monitor
electrical isolation in service, with the
obvious implication that driver
warnings and other appropriate
remedial actions will be taken if
isolation drifts below the specified 100
ohms/volt level.’’
NHTSA’s response: We are proposing
to set the electrical isolation for DC at
125 ohms/volt, not 100 ohms/volt.5 As
3 For the reader’s reference, ohms are a measure
of electrical resistance, or how much the material
of an electrical circuit resists the flow of electricity
(thus, a higher number indicates more resistance),
and volts are a measure of voltage, or how much
electrical potential there is between any two points
in a circuit (or, how much force is required to push
the electrical current through the circuit).
4 SAE J1766 (rev. April 2005) states that ‘‘The
conductivity of [the aqueous] coolant is a key factor
in the isolation characteristics of a fuel cell. Coolant
conductance [of electrical current] increases with
time which decreases isolation.’’
5 It should be remembered that electrical isolation
(ohms/volt) is a measure of a material’s resistance
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noted above, FMVSS No. 305 currently
requires 500 ohms/volt electrical
isolation, which corresponds to 2
milliamps of body current for AC
systems.6 To produce the same
physiological effects (at least, before the
onset of serious physical harm), the
human body can withstand up to four
times the amount of DC as AC. Thus, the
DC current corresponding to the existing
FMVSS No. 305 requirement for AC (2
milliamps) would be 2 × 4 = 8 milliamps
DC current. 8 milliamps of current
corresponds to 125 ohms/volt electrical
isolation for DC, not 100 ohms/volt.7
This NPRM thus proposes to set the
electrical isolation for DC at 125 ohms/
volt.
B. Test Procedure Measurement Values
The electrical isolation test procedure
of FMVSS No. 305, contained in S7.6,
essentially consists of: (1) Identifying
the propulsion battery terminal that has
the highest voltage differential between
it and the vehicle chassis; (2) inserting
a resistor of known value between that
terminal and the vehicle chassis; and (3)
measuring the voltage difference
between the vehicle chassis and the
battery terminal. With those
measurements, the post-crash isolation
resistance is determined according to a
formula provided in the standard.
• The petitioner requested that
FMVSS No. 305 be amended to
recognize voltages of less than 60 VDC
or 30 VAC as an appropriate way to
provide electrical safety protection, as
the revised SAE J1766 already does. The
Alliance pointed out that most electric
vehicle designs use electrical contactors
to disconnect high voltage from the
propulsion battery in the event of a
crash or other loss of isolation. Thus,
they argued that the electrical isolation
test procedure of FMVSS No. 305 is
inappropriate for such designs, because
the voltage differential between the high
voltage system and the chassis would be
zero, which would put a zero in the
to electrical current passing through it: thus, a
higher electrical isolation means that less current
passes through.
6 Based on Figure 1 in IEC–479, International
Electrotechnical Commission, Technical Report:
Effects of current on human beings and livestock—
Part 1: General aspects (3rd ed., Sept. 1994). The
agency received this as part of a presentation
included in the Alliance’s petition for rulemaking.
Available for public viewing in the Office of
Crashworthiness Standards, National Highway
Traffic Safety Administration, 1200 New Jersey
Avenue, SE., West Building, Washington, DC
20590.
7 Based on Figure 2, id. The agency received this
as part of a presentation included in the Alliance’s
petition for rulemaking. According to the same
chart, 100 ohms/volt corresponds to 5 times the
amount of DC as AC, which is beyond the accepted
range of physical safety.
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denominator of the equation to calculate
isolation. The Alliance noted that
FMVSS No. 305 does not recognize the
absence of voltage as evidence of
electrical safety, and therefore
petitioned that the standard be revised
to recognize voltages of less than 60
VDC or 30 VAC as an appropriate way
to provide electrical safety protection.
NHTSA’s response: We agree that
FMVSS No. 305 is not explicit that a
voltage measurement of zero in the test
procedure is evidence of electrical
safety. We tentatively agree that it
would be evidence of electrical safety,
and are therefore proposing to change
the test requirement in S5.3 from
‘‘electrical isolation’’ to ‘‘electrical
safety,’’ so that ‘‘electrical isolation’’
becomes only one of the alternative
requirements for ‘‘electrical safety,’’
along with a requirement that voltage
between the vehicle chassis and the
high voltage source be less than 60 VDC
or 30 VAC. We believe that these
changes would clarify the issue raised
by the petitioner.
• The petitioner noted that NHTSA
had previously expressed concern over
the lack of a viable test procedure to test
FCVs with hydrogen, but emphasized
the importance of proceeding with this
rulemaking in order not to hamper
development of FCVs, and expressed its
view that the test procedure was a detail
that could be worked out later.
NHTSA’s response: The problem of
not having a viable test procedure is
that, for the safety of the testers, crash
tests are generally performed with
vehicles left unfueled or fueled with a
less volatile alternative substance.
However, FMVSS No. 305 and its
formulas for calculating electrical
isolation require that an electrical
output measurement be available during
the pretest and post-test phases of the
various crash tests. Fuel cells without
hydrogen, or filled with anything else,8
generate no electricity from which to
measure electrical output. A
determination as to whether FMVSS No.
305 will require further amendment to
address FCV testing will await the
results of ongoing research, and will not
be addressed in this rulemaking.
C. Test Procedure Measurement
Location on the Vehicle
FMVSS No. 305 (as well as previous
versions of SAE J1766) currently
requires the measurement of electrical
isolation in only one location, between
8 Such as helium, as suggested by SAE J2578,
‘‘Recommended Practice for General Fuel Cell
Safety.’’
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the high voltage bus 9 and the vehicle
chassis. If a vehicle has electrical
contactors located within the battery
pack, this single measurement is taken
between the downstream side of the
contactor and the vehicle chassis.
• The petitioner requested that
FMVSS No. 305 be amended to mirror
the revised SAE J1766, which specifies
several electrical isolation verification
locations instead of just one: (1) Across
the high voltage bus bar; (2) between the
high voltage source and the vehicle
chassis; (3) between the high voltage
return and the vehicle chassis; and (4)
between the conductive energy storage
device and the vehicle chassis.
NHTSA’s response: We are proposing
to change and add several definitions to
FMVSS No. 305 in order to address this
request. We agree that measurements
should be taken from all high voltage
sources for calculating electrical
isolation from the vehicle chassis,
because the risk of electric shock can
come from any high voltage source and
not just from the propulsion motor
batteries. Additionally, we recognize
that some electric-powered vehicles
may have both AC and DC high voltage
sources. Revised SAE J1766 added new
definitions for energy storage devices,
which take into consideration the fact
that ultra-capacitors 10 have replaced
propulsion batteries in some electricpowered vehicle designs.
We therefore propose to add a new
definition to S4 of FMVSS No. 305, to
define ‘‘high voltage source’’ as either
an electrical power-generating device or
an energy storage device that produces
voltage levels equal to or greater than 30
VAC or 60 VDC.11 Other proposed
changes to S4 include the addition of a
definition for ‘‘electrical isolation,’’ to
reflect that isolation measurements are
to be taken between any high-voltage
source and the vehicle’s chassis; and the
deletion of the existing definition for
‘‘battery system component’’ and its
replacement with a definition for
‘‘energy storage system’’ which includes
ultra-capacitors, high voltage batteries,
and their associated hardware. Several
9 A high voltage bus (or bus-bar) is a distribution
location where multiple connections are made for
the electrical circuits.
10 Ultra-capacitors act like batteries in that they
store electrical energy and pose the same electrical
safety hazards as batteries, except for electrolyte
spillage.
11 We note that unlike SAE J1766, which specifies
‘‘high-voltage systems’’ as greater than 60 VDC or
30 VAC, ECE R.100 specifies high-voltage systems
as greater than 60 VDC or 25 VAC. The AC high
voltage value may eventually change in the final
rule to make the definition consistent, pending the
development of an internationally-consistent
definition of high-voltage system through a global
technical regulation (see discussion in Section III
below, ‘‘International Harmonization’’).
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other sections of FMVSS No. 305 would
also be amended to reflect the changes
proposed above.
D. Setting 0.2 Joules as an Appropriate
Low Energy Threshold
• The petitioner requested that
FMVSS No. 305 also be amended to
mirror revised SAE J1766 insofar as that
standard specifies an energy level below
0.2 joules as another appropriate way to
provide electrical safety protection. The
petitioner noted that the 0.2 joules of
energy value specified in SAE J1766 was
derived using data from the IEC 479–1
charts, and is non-harmful.12 The
petitioner also noted for comparison
that static electricity, which can involve
voltages of more than 10,000 volts, is
nevertheless benign to human health
due to the low current and short
durations associated with discharge.
NHTSA’s response: We are seeking
comments on the inclusion of 0.2 joules
as an appropriate low energy threshold
in FMVSS No. 305 to reflect that low
amounts of electrical energy are
acceptable. The agency remains less
than fully convinced of the need for this
amendment. The SAE’s methodology,
assuming a 10 ms duration of contact,
does not seem realistic in the context of
an automobile crash, and in fact would
be much more typical as a result of
static buildup than a fault contact with
a high voltage electrical system after a
crash.
Additionally, NHTSA is concerned
about the practicality of measuring a
mere 0.2 joules of energy in a crash test
environment. Comment to help the
agency resolve this issue is requested.
E. Harmonizing FMVSS No. 305’s Rear
Impact Test Procedure With FMVSS No.
301
The original version of FMVSS No.
305 13 incorporated the rear moving
barrier test of FMVSS No. 301, Fuel
System Integrity, which at the time was
a 30 mph (48 km/h) test. In a 2004 final
rule, response to petitions for
reconsideration on FMVSS No. 301,14
the agency amended FMVSS No. 305 to
give manufacturers the option of
conducting either a rigid moving barrier
48–km/h test, or an upgraded–FMVSS
No. 301 moving deformable barrier 80–
km/h test. We stated that:
Prior to the upgrade of the FMVSS No. 301
rear moving barrier impact test, compliance
with the FMVSS Nos. 301 and 305 rear
moving barrier requirements was based on
12 This was based on 200 mA of current, with a
duration of 10 ms and a voltage of 200V with a
safety factor of 2.
13 The final rule promulgating FMVSS No. 305 is
available at 65 FR 57980–57992 (Sept. 27, 2000).
14 69 FR 51393 (Aug. 19, 2004).
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similar test conditions and procedures. The
similarity in test conditions gave
manufacturers of gas-electric hybrid vehicles
the opportunity to conduct one test instead
of two to determine compliance with the two
sets of rear impact requirements. Gas-electric
hybrid vehicles with a GVWR of 4,536 kg or
less are subject to the rear moving impact
requirements of both FMVSS Nos. 301 and
305, if they use both liquid fuel and more
than 48 nominal volts of electricity as
propulsion power. As a result of the FMVSS
No. 301 upgrade, compliance with the
FMVSS Nos. 301 and 305 rear moving barrier
requirements is no longer based on similar
test conditions and procedures. The
differences in the conditions and procedures
could eliminate the opportunity to conduct
one test instead of two for gas-electric hybrid
vehicles. To reinstate the opportunity to
conduct two tests instead of one, we are
amending FMVSS No. 305 to permit
compliance with the electrolyte spillage,
battery retention and electrical isolation rear
moving barrier impact requirements of
FMVSS No. 305 under the upgraded FMVSS
No. 301 rear moving barrier test conditions.15
• The petitioner requested that the
rear impact test speed of FMVSS No.
305 should be amended to correspond
with the 80 km/h speed now required
by FMVSS No. 301. The petitioner also
stated that this would align FMVSS No.
305 with the recently amended
Canadian Motor Vehicle Safety
Standard 305, which requires the 80
km/h speed for vehicles produced after
September 1, 2009.
NHTSA’s response: We are proposing
to amend FMVSS No. 305 to specify
only the 80 km/h test. NHTSA agrees
that the rear test speed for FMVSS No.
305 should reflect the speed required in
FMVSS No. 301, which is currently
being phased in and will be required for
all vehicles with liquid fuel systems
manufactured after September 1, 2009.
As noted by the Alliance, this change
would also facilitate harmonization
with Canadian Standard 305. Therefore,
NHTSA proposes to amend FMVSS No.
305 to specify only the 80 km/h rear
impact test, with S6.2 and S7.4 changed
accordingly.
III. International Harmonization
As long as safety is preserved, NHTSA
believes that the same voltage should be
used worldwide to denote high voltage
systems, because vehicle manufacturers
(and ultimately, consumers) can expect
to achieve cost savings through the
harmonization of different sets of
standards. However, NHTSA is not
ready just yet to harmonize fully with
other international standards. Globally,
there are several existing regulations
and standards that pertain to high
voltage systems in electric-powered
15 Id.,
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motor vehicles. The agency has been
collaborating with the international
community to develop a global
technical regulation (GTR) for hydrogenpowered motor vehicles through its
active participation in the United
Nations World Forum for the
Harmonization of Vehicle Regulations
(WP.29). It has been agreed by WP.29
that a GTR be developed for hydrogenpowered motor vehicles. The United
States, Germany, and Japan as sponsors
have completed development of an
action plan that outlines the key safety
areas of hydrogen and FCVs for the
GTR. The definition of high voltage
systems in automobiles would likely be
part of the development of this GTR.
The existing requirements in the
European regulation, ECE R.100,
‘‘Uniform provisions concerning the
approval of battery electric vehicles
with regard to specific requirements for
the construction, functional safety and
hydrogen emission,’’ specify that
battery-powered electric vehicles must
maintain 500 ohms/volt electrical
isolation between the propulsion battery
and the vehicle chassis. This is similar
to the requirement in FMVSS No. 305.
NHTSA is aware that the ECE is
currently considering changing this
requirement to meet a 100 ohms/volt
electrical isolation between the high
voltage system and the vehicle chassis,
without distinguishing between AC
(greater than 25 volts) or DC (greater
than 60 volts) electrical current. The
ECE’s draft amendments also allow for
up to 10 milliamps of continuous
electrical current or 100 ohms/volt of
resistance. NHTSA has also examined
the recent Japanese regulation TRIAS
11–1–4–101, ‘‘Technical Standard for
Protection of Occupants Against High
Voltage in Fuel Cell Vehicles,’’ which
requires 100 ohms/volt electrical
isolation between the chassis and the
high-voltage system of those vehicles
whose operating voltage is greater than
60 VDC.
Despite our interest in international
harmonization, NHTSA does not believe
that allowing 10 milliamps of
continuous electrical current is
sufficiently safe. Even for a duration of
2 seconds, 10 milliamps of AC electrical
current could result in a reversible
disturbance in the heart (such as atrial
fibrillation and transient cardiac arrest
without ventricular fibrillation).16
Because of this, NHTSA is not
proposing any changes to the existing
isolation requirements for AC high
voltage sources. Similarly, NHTSA does
not believe that a change from the
16 IEC 479–1, Table 4—Time/current zones for a.c.
15 Hz to 100 Hz, p. 41.
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existing ECE requirement of 500 ohms/
volt isolation to a requirement of 100
ohms/volt isolation, without
distinguishing between AC and DC
current, would be consistent with the
best interests of safety. Additionally,
neither the Alliance petition nor the
revised SAE J1766 recommend any
changes to the existing requirement of
500 ohms/volt isolation between AC
high voltage sources and the chassis.
Public comment is requested on the
above values for electrical isolation and
continuous current.
IV. The Proposed Rule
A. Amending FMVSS No. 305 To
Accommodate Fuel Cell Vehicles
This NPRM proposes to amend
FMVSS No. 305 by revising certain
sections in order to realign the standard
with the April 2005 update of SAE
J1766 that was changed to accommodate
fuel cell vehicles and avoid hindering
the development of that market. The
following points highlight the key
provisions of the proposed
requirements:
• The NPRM would change the
applicability of FMVSS No. 305 to
accommodate state-of-the-art FCVs that
use 60 VDC or 30 VAC or more for
propulsion power instead of the existing
48 nominal volts.
• The NPRM would distinguish
between isolation values for DC and AC
currents, setting the value for DC highvoltage systems at 125 ohms/volt.
• The NPRM would accommodate
current FCV technology by changing the
test requirement in S5.3 from ‘‘electrical
isolation’’ alone to ‘‘electrical safety,’’
which would also include an alternative
requirement that the voltage between
the high-voltage source and the vehicle
chassis be less than 60 VDC or 30 VAC.
• The NPRM would add a definition
for ‘‘high-voltage source,’’ and amend
the definition for ‘‘electrical isolation’’
to reflect that isolation measurements
shall be taken from any high-voltage
source and the vehicle’s chassis, instead
of from only one location.
• The NPRM would harmonize S6.2
and S7.4 of FMVSS No. 305 with the
revised FMVSS No. 301, as regards rear
moving barrier impact test conditions.
B. Effective Date
NHTSA here proposes that the
effective date of this rulemaking apply
to vehicles manufactured one year after
the final rule is published, with optional
early compliance. The agency believes
that one year should be sufficient for
manufacturers to verify that they can
meet the new electrical isolation
requirements, particularly since similar
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requirements already exist as a SAE
recommended practice. Currently, all
manufacturers of electric-powered
vehicles already isolate the high voltage
sources from the vehicle chassis.
IV. Benefits/Costs
NHTSA anticipates no quantifiable
economic or fatality-reduction benefits
from this proposed rule. The update to
FMVSS No. 305 represents an increase
in the stringency of the level of safety
provided by the standard for FCVs that
are currently in development but not yet
on the roads. Because the safety benefits
will be in the future, they are not
currently quantifiable. Immediate
benefits that will likely accrue are
primarily of a policy nature: That the
hydrogen FCV market will not be
hindered in its continuing development,
as the petitioner asserted; that various
small inconsistencies that have lingered
in the standard will be corrected; and so
forth.
NHTSA believes that the cost
associated with this rulemaking would
be negligible. Any added cost would
consist only of what was involved in
taking additional readings at different
test points within vehicles that have
both AC and DC power systems.
Moreover, the vehicle manufacturers
potentially affected by this proposed
rule were involved in the update of SAE
J1766 (which was revised to
accommodate their current FCV
designs), and are presumably already
complying with that standard, so the
additional cost of compliance with the
proposed rule should be de minimis if
not zero.
VI. Public Participation
How Do I Prepare and Submit
Comments?
Your comments must be written and
in English. To ensure that your
comments are filed correctly in the
Docket, please include the docket
number of this document in your
comments.
Your comments must not be more
than 15 pages long (see 49 CFR 553.21).
We established this limit to encourage
you to write your primary comments in
a concise fashion. However, you may
attach necessary additional documents
to your comments. There is no limit on
the length of the attachments.
Please submit two copies of your
comments, including the attachments,
to Docket Management at the address
given under ADDRESSES.
You may also submit your comments
to the docket electronically by logging
onto the Dockets Management System
website at https://dms.dot.gov. Click on
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‘‘Help & Information,’’ or ‘‘Help/Info’’ to
obtain instructions for filing the
document electronically.
How Can I Be Sure That My Comments
Were Received?
If you wish Docket Management to
notify you upon its receipt of your
comments, enclose a self-addressed,
stamped postcard in the envelope
containing your comments. Upon
receiving your comments, Docket
Management will return the postcard by
mail.
How Do I Submit Confidential Business
Information?
If you wish to submit any information
under a claim of confidentiality, you
should submit three copies of your
complete submission, including the
information you claim to be confidential
business information, to the Chief
Counsel, NHTSA, at the address given
above under FOR FURTHER INFORMATION
CONTACT. In addition, you should
submit two copies, from which you
have deleted the claimed confidential
business information, to Docket
Management at the address given above
under ADDRESSES. When you send a
comment containing information
claimed to be confidential business
information, you should include a cover
letter setting forth the information
specified in our confidential business
information regulation (49 CFR part
512).
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Will The Agency Consider Late
Comments?
We will consider all comments that
Docket Management receives before the
close of business on the comment
closing date indicated above under
DATES. To the extent possible, we also
will consider comments that Docket
Management receives after that date. If
Docket Management receives a comment
too late for us to consider it in
developing the final rule, we will
consider that comment as an informal
suggestion for future rulemaking action.
How Can I Read The Comments
Submitted By Other People?
You may read the comments received
by Docket Management at the address
given under ADDRESSES. The hours of
the Docket are indicated above in the
same location.
You also may see the comments on
the Internet. To read the comments on
the Internet, go to https://
www.regulations.gov, and follow the
instructions for accessing the Docket.
Please note that even after the
comment closing date, we will continue
to file relevant information in the
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Docket as it becomes available. Further,
some people may submit late comments.
Accordingly, we recommend that you
periodically check the Docket for new
material.
VII. Rulemaking Analyses and Notices
A. Executive Order 12866 and DOT
Regulatory Policies and Procedures
This rulemaking document was not
reviewed by the Office of Management
and Budget under E.O. 12866. It is not
considered to be significant under E.O.
12866 or the Department’s Regulatory
Policies and Procedures (44 FR 11034;
Feb. 26, 1979). This proposed rule
should have no significant effect on the
national economy, and simply clarifies
for FCV manufacturers their obligations
under FMVSS No. 305.
B. Regulatory Flexibility Act
Pursuant to the Regulatory Flexibility
Act (5 U.S.C. 601 et seq., as amended by
the Small Business Regulatory
Enforcement Fairness Act (SBREFA) of
1996), whenever an agency is required
to publish a notice of rulemaking for
any proposed or final rule, it must
prepare and make available for public
comment a regulatory flexibility
analysis that describes the effect of the
rule on small entities (i.e., small
businesses, small organizations, and
small governmental jurisdictions). The
Small Business Administration’s
regulations at 13 CFR part 121 define a
small business, in part, as a business
entity ‘‘which operates primarily within
the United States.’’ (13 CFR 121.105(a)).
No regulatory flexibility analysis is
required if the head of an agency
certifies the rule will not have a
significant economic impact on a
substantial number of small entities.
SBREFA amended the Regulatory
Flexibility Act to require Federal
agencies to provide a statement of the
factual basis for certifying that a rule
will not have a significant economic
impact on a substantial number of small
entities.
NHTSA has considered the effects of
this proposed rule under the Regulatory
Flexibility Act. I certify that this
proposed rule would not have a
significant economic impact on a
substantial number of small entities.
Any small manufacturers that might be
affected by this proposed rule are
already subject to the requirements of
FMVSS No. 305, and the testing costs
added by this proposed rule are
anticipated to be extremely small.
Therefore, there should be only a very
minor economic impact, if any.
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C. Executive Order 13132 (Federalism)
NHTSA has examined today’s final
rule pursuant to Executive Order 13132
(64 FR 43255, August 10, 1999) and
concluded that no additional
consultation with States, local
governments or their representatives is
mandated beyond the rulemaking
process. The agency has concluded that
the rule does not have federalism
implications because the rule does not
have ‘‘substantial direct effects on the
States, on the relationship between the
national government and the States, or
on the distribution of power and
responsibilities among the various
levels of government.’’
Further, no consultation is needed to
discuss the preemptive effect of today’s
rule. NHTSA rules can have preemptive
effect in at least two ways. First, the
National Traffic and Motor Vehicle
Safety Act contains an express
preemptive provision: ‘‘When a motor
vehicle safety standard is in effect under
this chapter, a State or a political
subdivision of a State may prescribe or
continue in effect a standard applicable
to the same aspect of performance of a
motor vehicle or motor vehicle
equipment only if the standard is
identical to the standard prescribed
under this chapter.’’ 49 U.S.C.
30103(b)(1). It is this statutory command
that preempts State law, not today’s
rulemaking, so consultation would be
inappropriate.
In addition to the express preemption
noted above, the Supreme Court has
also recognized that State requirements
imposed on motor vehicle
manufacturers, including sanctions
imposed by State tort law, can stand as
an obstacle to the accomplishment and
execution of a NHTSA safety standard.
When such a conflict is discerned, the
Supremacy Clause of the Constitution
makes their State requirements
unenforceable. See Geier v. American
Honda Motor Co., 529 U.S. 861 (2000).
NHTSA has not outlined such potential
State requirements in today’s
rulemaking, however, in part because
such conflicts can arise in varied
contexts, but it is conceivable that such
a conflict may become clear through
subsequent experience with today’s
standard and test regime. NHTSA may
opine on such conflicts in the future, if
warranted. See id. at 883–86.
D. National Environmental Policy Act
NHTSA has analyzed this rulemaking
action for the purposes of the National
Environmental Policy Act. The agency
has determined that implementation of
this action will not have any significant
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impact on the quality of the human
environment.
E. Executive Order 12988 (Civil Justice
Reform)
With respect to the review of the
promulgation of a new regulation,
section 3(b) of Executive Order 12988,
‘‘Civil Justice Reform’’ (61 FR 4729,
February 7, 1996) requires that
Executive agencies make every
reasonable effort to ensure that the
regulation: (1) Clearly specifies the
preemptive effect; (2) clearly specifies
the effect on existing Federal law or
regulation; (3) provides a clear legal
standard for affected conduct, while
promoting simplification and burden
reduction; (4) clearly specifies the
retroactive effect, if any; (5) adequately
defines key terms; and (7) addresses
other important issues affecting clarity
and general draftsmanship under any
guidelines issued by the Attorney
General. This document is consistent
with that requirement.
Pursuant to this Order, NHTSA notes
as follows. The preemptive effect of this
rule is discussed above. NHTSA notes
further that there is no requirement that
individuals submit a petition for
reconsideration or pursue other
administrative proceeding before they
may file suit in court.
F. Privacy Act
Please note that anyone is able to
search the electronic form of all
comments received into any of our
dockets by the name of the individual
submitting the comment (or signing the
comment, if submitted on behalf of an
association, business, labor union, etc.).
You may review DOT’s complete
Privacy Act Statement in the Federal
Register published on April 11, 2000
(Volume 65, Number 70; Pages 19477–
78), or you may visit https://
DocketInfo.dot.gov.
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G. Paperwork Reduction Act
Under the Paperwork Reduction Act
of 1995 (PRA), a person is not required
to respond to a collection of information
by a Federal agency unless the
collection displays a valid OMB control
number. There are no information
collection requirements associated with
this NPRM, nor would there be
information collection requirements if
this proposed rule were to be made
final.
H. National Technology Transfer and
Advancement Act
Section 12(d) of the National
Technology Transfer and Advancement
Act of 1995 (NTTAA), Public Law 104–
113 (15 U.S.C. 272) directs the agency
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to evaluate and use voluntary consensus
standards in its regulatory activities
unless doing so would be inconsistent
with applicable law or is otherwise
impractical. Voluntary consensus
standards are technical standards (e.g.,
materials specifications, test methods,
sampling procedures, and business
practices) that are developed or adopted
by voluntary consensus standards
bodies, such as the Society of
Automotive Engineers (SAE). The
NTTAA directs us to provide Congress
(through OMB) with explanations when
the agency decides not to use available
and applicable voluntary consensus
standards. The NTTAA does not apply
to symbols.
FMVSS No. 305 has historically
drawn largely from SAE J1766, and does
so again for this current rulemaking,
which updates FMVSS No. 305 based
on a recent updating of SAE J1766.
NHTSA is not, however, adopting SAE
J1766 verbatim, for the reasons
discussed in Section C(1) above, and is
proposing an isolation level of 125
ohms/volt instead of 100 ohms/volt for
DC current. The agency believes that
this will best avoid reducing the safety
benefits of FMVSS No. 305 as it is
currently written.
NHTSA requests public comment on
the appropriateness of also considering
the 2006 International Organization for
Standardization (ISO) standard ISO
23273–3, ‘‘Fuel cell road vehicles—
Safety specifications—Part 3: Protection
of persons against electric shock.’’
List of Subjects in 49 CFR Part 565
Imports, Motor vehicles, Motor
vehicle safety, and Tires.
In consideration of the foregoing,
NHTSA proposes to amend 49 CFR Part
571.305 as follows:
PART 571—FEDERAL MOTOR
VEHICLE SAFETY STANDARDS
1. The authority citation for part 571
continues to read as follows:
Authority: 49 U.S.C. 322, 30111, 30115,
30117, and 30166; delegation of authority at
49 CFR 1.50.
2. Amend § 571.305 by revising S1,
S2, S3, S4, S5.2, S5.3, S6.2, S7, S7.1,
S7.2, S7.4, S7.6, S7.6.1, S7.6.2, S7.6.3,
S7.6.4, S7.6.5, S7.6.6, and S7.6.7 to read
as follows:
§ 571.305 Standard No. 305; Electricpowered vehicles: Electrolyte spillage and
electrical shock protection.
S1 Scope. This standard specifies
requirements for limitation of
electrolyte spillage, retention of energy
storage devices, and protection from
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harmful electric shock during and after
a crash.
S2 Purpose. The purpose of this
standard is to reduce deaths and injuries
during a crash which occur because of
electrolyte spillage from energy storage
devices, intrusion of energy storage
device system components into the
occupant compartment, and electrical
shock.
S3 Application. This standard
applies to passenger cars, and to
multipurpose passenger vehicles, trucks
and buses with a GVWR of 4536 kg or
less, that use more than 60 volts direct
current (VDC) or 30 volts alternating
current (VAC) of electricity as
propulsion power and whose speed
attainable over a distance of 1.6 km on
a paved level surface is more than 40
km/h.
S4 Definitions.
Dummy means a 50th percentile male
test dummy as specified in subpart F of
part 572 of this chapter.
Electrical isolation means the
electrical resistance between the vehicle
high-voltage source and any vehicle
conductive structure.
Energy storage system means the
components comprising, but not limited
to, the vehicle’s high-voltage battery
system or capacitor system. These
include, but are not limited to, the
battery or capacitor modules,
interconnects, venting systems, battery
or capacitor restraint devices, and
energy storage boxes or containers that
hold the individual battery or capacitor
modules.
High-voltage source means any item
that produces voltage levels equal to or
greater than 30 VAC or 60 VDC.
VAC means volts of alternating
current (AC).
VDC means volts of direct current
(DC).
*
*
*
*
*
S5.2 Energy storage device retention.
Energy storage system modules located
inside the passenger compartment must
remain in the location in which they are
installed. Any energy storage system
component that is located outside the
passenger compartment must not enter
the passenger compartment during the
test procedures of S6 of this standard, as
determined by visual inspection.
S5.3 Electrical safety. After each
test, electrical isolation and energy
between any high-voltage source and
the vehicle chassis electricityconducting structure must meet the
following:
(a) For AC high-voltage systems,
electrical isolation is not less than 500
ohms/volt; or
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(b) For DC high-voltage systems,
electrical isolation is not less than 125
ohms/volt.
*
*
*
*
*
S6.2 Rear moving barrier impact.
The vehicle must meet the requirements
of S5.1, S5.2, and S5.3 when it is
impacted from the rear by a barrier that
conforms to S7.3(b) of Sec. 571.301 of
this chapter and that is moving at any
speed up to and including 80 km/h (50
mph) with dummies positioned in
accordance with S6.2 of Sec. 571.301 of
this chapter.
*
*
*
*
*
S7 Test conditions. When the
vehicle is tested according to S6, the
requirements of S5 must be determined
by the conditions specified in S7.1
through S7.6.7. All measurements for
calculating electrical isolation or the
amount of electrical energy will be
made after a minimum of 5 seconds
immediately after the tests specified in
S6. Where a range is specified, the
vehicle must be capable of meeting the
requirements at all points within the
range.
S7.1 Energy storage device state of
charge. The energy storage device is at
the level specified in the following
paragraphs (a), (b), or (c), as appropriate:
(a) At the maximum state of charge
recommended by the manufacturer, as
stated in the vehicle operator’s manual
or on a label that is permanently affixed
to the vehicle;
(b) If the manufacturer has made no
recommendation, at a state of charge of
not less than 95 percent of the
maximum capacity of the energy storage
device; or
(c) If the energy storage device(s) are
rechargeable only by an energy source
on the vehicle, at any state of charge
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within the normal operating voltage, as
defined by the vehicle manufacturer.
S7.2 Vehicle conditions. The switch
or device that provides power from the
high-voltage system to the propulsion
motor(s) is in the activated position or
the ready-to-drive position.
*
*
*
*
*
S7.4 Rear moving barrier impact test
conditions. In addition to the conditions
of S7.1 and S7.2, the conditions of S7.5
and S7.6 of Sec. 571.301 of this chapter
apply to the conducting of the rear
moving deformable barrier impact test
specified in S6.2.
*
*
*
*
*
S7.6 Electrical isolation test
procedure. In addition to the conditions
of S7.1 and S7.2, the conditions in
S7.6.1 through S7.6.7 apply to the
measuring of electrical isolation
specified in S5.3.
S7.6.1 Prior to any barrier impact
test, the high-voltage system is
connected to the vehicle’s propulsion
system, and the vehicle ignition is in the
‘‘on’’ (traction (propulsion) system
energized) position. If the vehicle
utilizes an automatic disconnect
between the high-voltage system and the
traction system that is physically
contained within the high-voltage
system, the electrical isolation
measurement after the test is made from
the traction system side of the automatic
disconnect to the vehicle chassis. If the
vehicle utilizes an automatic disconnect
that is not physically contained within
the high-voltage system, the electrical
isolation measurement after the impact
is made from the high-voltage source
side of the automatic disconnect to the
vehicle chassis.
S7.6.2 The voltmeter used in this
test has an internal resistance of at least
10 MW.
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S7.6.3 The voltage(s) is/are
measured as shown in Figure 1 and the
high-voltage source voltage(s) (Vb) is/are
recorded. Before any vehicle impact
test, Vb is equal to or greater than the
nominal operating voltage as specified
by the vehicle manufacturer.
S7.6.4 The voltage(s) is/are
measured as shown in Figure 2, and the
voltage(s) (V1) between the negative
side of the high-voltage source and the
vehicle chassis is/are recorded.
S7.6.5 The voltage(s) is/are
measured as shown in Figure 3, and the
voltage(s) (V2) between the positive side
of the high-voltage source and the
vehicle chassis is/are recorded.
S7.6.6 If V1 is greater than or equal
to V2, insert a known resistance (Ro)
between the negative side of the highvoltage source and the vehicle chassis.
With the Ro installed, measure the
voltage (V1’) as shown in Figure 4
between the negative side of the highvoltage source and the vehicle chassis.
Calculate the electrical isolation (Ri)
according to the formula shown.
S7.6.7 If V2 is greater than V1, insert
a known resistance (Ro) between the
positive side of the high-voltage source
and the vehicle chassis. With the Ro
installed, measure the voltage and
record the voltage (V2’) between the
positive side of the high-voltage source
and the vehicle chassis as shown in
Figure 5. Calculate the electrical
isolation (Ri) according to the formula
shown.
*
*
*
*
*
3. Further amend § 571.305 by
revising Figures 1, 2, 3, 4, and 5
following S7.6.7 to read as follows:
BILLING CODE 4910–59–C
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Federal Register / Vol. 72, No. 194 / Tuesday, October 9, 2007 / Proposed Rules
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Federal Register / Vol. 72, No. 194 / Tuesday, October 9, 2007 / Proposed Rules
Issued: October 2, 2007.
Stephen R. Kratzke,
Associate Administrator for Rulemaking.
[FR Doc. E7–19735 Filed 10–5–07; 8:45 am]
BILLING CODE 4910–59–P
DEPARTMENT OF THE INTERIOR
Fish and Wildlife Service
50 CFR Part 17
Endangered and Threatened Wildlife
and Plants; 90-Day Finding on a
Petition To List the Giant Palouse
Earthworm as Threatened or
Endangered
Fish and Wildlife Service,
Interior.
ACTION: Notice of 90-day petition
finding.
AGENCY:
SUMMARY: We, the U.S. Fish and
Wildlife Service (Service), announce a
90-day finding on a petition to list the
giant Palouse earthworm (Driloleirus
americanus) as threatened or
endangered under the Endangered
Species Act of 1973, as amended. We
find that the petition does not provide
substantial scientific or commercial
information to indicate that listing the
giant Palouse earthworm may be
warranted. Therefore, we will not be
initiating a status review in response to
this petition. However, we encourage
the public to submit to us any new
information that becomes available
concerning this species.
DATES: The finding announced in this
document was made on October 9, 2007.
ADDRESSES: Data and new information
concerning the giant Palouse earthworm
may be submitted to the Supervisor,
Upper Columbia Fish and Wildlife
Office, U.S. Fish and Wildlife Service,
11103 East Montgomery Drive, Spokane,
WA 99206. The petition, administrative
finding, supporting data, and comments
received will be available for public
inspection, by appointment, during
normal business hours at the above
address.
pwalker on PROD1PC71 with PROPOSALS
FOR FURTHER INFORMATION CONTACT:
Susan Martin, Field Supervisor, at the
above address, by phone at (509) 891–
6838, or facsimile at (509) 891–6748.
Please include ‘‘giant Palouse
earthworm scientific information’’ in
the subject line for faxes. If you use a
telecommunications device for the deaf
(TDD), call the Federal Information
Relay Service (FIRS) at 800–877–8339.
SUPPLEMENTARY INFORMATION:
VerDate Aug<31>2005
17:36 Oct 05, 2007
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Background
Section 4(b)(3)(A) of the Endangered
Species Act of 1973, as amended (16
U.S.C. 1531 et seq.) (Act), requires that
we make a finding on whether a petition
to list, delist, or reclassify a species,
presents substantial scientific or
commercial information to indicate that
the petitioned action may be warranted.
To the maximum extent practicable, we
are to make the finding within 90 days
of our receipt of the petition, and
publish a notice of the finding promptly
in the Federal Register.
This finding summarizes the
information included in the petition and
information available to us at the time
of the petition review. Under section
4(b)(3)(A) of the Act and our regulations
in 50 CFR 424.14(b), our review of a 90day finding is limited to a determination
of whether the information in the
petition meets the ‘‘substantial
information’’ threshold. Our standard
for substantial information within the
Code of Federal Regulations (CFR) with
regard to a 90-day petition finding is
‘‘that amount of information that would
lead a reasonable person to believe that
the measure proposed in the petition
may be warranted’’ (50 CFR 424.14(b)).
If we find that substantial information
was presented, we are required to
promptly commence a review of the
status of the species.
We have to satisfy the Act’s
requirements that we use the best
available science to make our decisions.
However, we do not conduct additional
research at this point, nor do we subject
the petition to rigorous critical review.
Rather, at the 90-day finding stage, we
accept the petitioners’ sources and
characterizations of the information, to
the extent that they appear based on
accepted scientific principles (such as
citing published and peer-reviewed
articles, or studies done in accordance
with valid methodologies), unless we
have specific information to the
contrary. Our finding considers whether
the petition states a reasonable case that
listing may be warranted based on the
information presented. Thus, our 90-day
finding expresses no view as to the
ultimate issue of whether the species
should be listed.
On August 30, 2006, we received a
petition, dated August 18, 2006, from a
private citizen and five other concerned
parties requesting that we emergency
list the giant Palouse earthworm
(Driloleirus americanus) as threatened
or endangered, and that critical habitat
be designated concurrently with the
listing. The other five concerned parties
include the Palouse Prairie Foundation,
the Palouse Audubon Society, Friends
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of the Clearwater, and two other private
citizens (hereafter referred to as the
petitioners). The petition clearly
identified itself as a petition and
included the requisite identification
information for the petitioners, as
required in 50 CFR 424.14(a). The
petition contained information on the
natural history of the giant Palouse
earthworm and potential threats to the
species. Potential threats discussed in
the petition include destruction and
modification of habitat, disease and
predation, inadequacy of regulatory
mechanisms, and other natural and
manmade factors, such as invasive and
noxious weeds and road-building
activities.
On October 2, 2006, we notified the
petitioners that our initial review of the
petition for the giant Palouse earthworm
concluded that an emergency listing
was not warranted, and that, due to
court orders and judicially approved
settlement agreements for other listing
actions, we would not be able to further
address the petition to list the giant
Palouse earthworm at that time. This
finding addresses the petition.
Species Information
The giant Palouse earthworm was first
described by Frank Smith in 1897 after
he discovered it near Pullman,
Washington: ‘‘* * * this species is very
abundant in that region of the country
and their burrows are sometimes seen
extending to a depth of over 15 feet.’’
Although only a few specimens have
been collected, early descriptions and
collection locations indicated that the
giant Palouse earthworm can be as long
a 3 feet (0.9 meters) and is considered
by some an endemic that utilizes
grassland sites with good soil and native
vegetation of the Palouse bioregion
(James 1995, p. 1; Niwa et al. 2001, p.
34). It has been described as an Anecic
earthworm, one of three basic
earthworm types, based on its
functional role in the soil ecosystem.
Anecic earthworms are the largest and
longest lived (James 2000, pp. 8–10,
1995, p. 6). Anecic earthworms
uniquely contribute to the soil
ecosystem by transporting fresh plant
material from the soil surface to
subterranean levels. The deep burrows
also aid in water infiltration (James
2000, p. 9; Edwards 2004, pp. 30–31).
Population Status
The petition stated that since the
initial description of the giant Palouse
earthworm, sightings have been
extremely infrequent. In 2005, a
University of Idaho graduate student
conducting soil samples was the first
person in nearly two decades to report
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Agencies
[Federal Register Volume 72, Number 194 (Tuesday, October 9, 2007)]
[Proposed Rules]
[Pages 57260-57273]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E7-19735]
=======================================================================
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
National Highway Traffic Safety Administration
49 CFR Part 571
[Docket No. NHTSA-2007-28517]
RIN 2127-AK05
Federal Motor Vehicle Safety Standards; Electric-Powered
Vehicles: Electrolyte Spillage and Electrical Shock Protection
AGENCY: National Highway Traffic Safety Administration (NHTSA),
Department of Transportation (DOT).
ACTION: Notice of proposed rulemaking (NPRM).
-----------------------------------------------------------------------
SUMMARY: Based on concern that the agency's standard on electric-
powered vehicles, as currently written, may inadvertently hinder the
development of fuel cell vehicles in the United States, NHTSA is
proposing to amend the electrical safety requirements of Federal Motor
Vehicle Safety Standard (FMVSS) No. 305, Electric-powered vehicles:
electrolyte spillage and electrical shock protection. The amendment
would ensure that state-of-the-art fuel cell vehicles (FCVs) are
consistent with the interests of safety and encompassed by FMVSS No.
305 so that the market may continue to develop. This NPRM also proposes
to harmonize FMVSS No. 305 with the revised FMVSS No. 301, as regards
rear moving barrier impact test conditions. This rulemaking commenced
in response to a petition from the Alliance of Automobile
Manufacturers.
DATES: You should submit your comments early enough to ensure that
Docket Management receives them not later than December 10, 2007.
Proposed effective date of final rule: assuming that a final rule is
issued, NHTSA proposes that the changes adopted by the rule would be
mandatory for fuel cell vehicles manufactured on or after exactly one
year from the date of publication of the final rule in the Federal
Register, with optional early compliance.
[[Page 57261]]
ADDRESSES: You may submit comments [identified by DOT Docket ID Number
NHTSA-2007-28517] by any of the following methods:
Federal eRulemaking Portal: Go to https://
www.regulations.gov. Follow the online instructions for submitting
comments.
Mail: Docket Management Facility: U.S. Department of
Transportation, 1200 New Jersey Avenue, SE., West Building Ground
Floor, Room W12-140, Washington, DC 20590-0001.
Hand Delivery or Courier: West Building Ground Floor, Room
W12-140, 1200 New Jersey Avenue, SE., between 9 a.m. and 5 p.m. ET,
Monday through Friday, except Federal holidays.
Fax: 202-493-2251.
Instructions: For detailed instructions on submitting comments and
additional information on the rulemaking process, see the Public
Participation heading of the Supplementary Information section of this
document. Note that all comments received will be posted without change
to https://www.regulations.gov, including any personal information
provided. Please see the Privacy Act heading below.
Privacy Act: Anyone is able to search the electronic form of all
comments received into any of our dockets by the name of the individual
submitting the comment (or signing the comment, if submitted on behalf
of an association, business, labor union, etc.). You may review DOT's
complete Privacy Act Statement in the Federal Register published on
April 11, 2000 (65 FR 19477-78) or you may visit https://
DocketInfo.dot.gov.
Docket: For access to the docket to read background documents or
comments received, go to https://www.regulations.gov or the street
address listed above. Follow the online instructions for accessing the
dockets.
FOR FURTHER INFORMATION CONTACT: For technical issues, you may call Mr.
Charles Hott, Office of Rulemaking (Telephone: 202-366-0247) (Fax: 202-
493-2990). For legal issues, you may call Ms. Rebecca Schade, Office of
Chief Counsel (Telephone: 202-366-2992) (Fax: 202-366-3820). You may
send mail to these officials at National Highway Traffic Safety
Administration, U.S. Department of Transportation, 1200 New Jersey
Avenue, SE., West Building, Washington, DC 20590.
SUPPLEMENTARY INFORMATION:
Table of Contents
I. Background
II. Petitioner's Suggested Changes; NHTSA's Decisions on the
Petition
A. Fuel cell vehicles and FMVSS No. 305's isolation requirement
B. Test Procedure Measurement Values
C. Test Procedure Measurement Location on the Vehicle
D. Setting 0.2 Joules as an Appropriate Low Energy Threshold
E. Harmonizing FMVSS No. 305's Rear Impact Test Procedure with
FMVSS No. 301
III. International Harmonization
IV. The Proposed Rule
V. Benefits/Costs
VI. Public Participation
VII. Rulemaking Analyses and Notices
I. Background
Vehicles that use electricity as propulsion power can contain high
voltage systems operating with several hundred volts at a time, as
compared to conventional petroleum-powered vehicles, which usually
contain only a 12-volt battery to power accessories like headlights,
radios, and so forth. Thus, electric vehicles potentially pose
electrical risks not posed by conventional petroleum-powered vehicles.
During a crash, NHTSA requires electric vehicles to limit electrolyte
spillage, retain energy storage devices, and maintain isolation between
the vehicle's chassis and high-voltage system (49 Code of Federal
Regulations (CFR) Part 571.305, ``Electric-powered vehicles:
electrolyte spillage and electrical shock protection;'' also referred
to as Federal Motor Vehicle Safety Standard (FMVSS) No. 305).
Maintaining electrical isolation ensures that the high voltage system
does not use the chassis itself to complete (or close) the circuit.
This makes it less likely that a human or other object could touch the
chassis and become part of the circuit, allowing electrical current to
flow through them. FMVSS No. 305 is intended to protect occupants,
rescue workers, or others who may come in contact with the vehicle
after a crash from electrical shock hazards, by ensuring isolation of
the vehicle's high voltage battery electrical system.
FMVSS No. 305 was originally drafted based on a voluntary consensus
standard, the Society of Automotive Engineers (SAE) Recommended
Practice for Electric and Hybrid Electric Vehicle Battery Systems Crash
Integrity Testing (SAE J1766). SAE J1766 was first issued in 1996 and
most recently updated in April 2005 in order to accommodate fuel cell
vehicles (FCVs), based on concerns that SAE J1766 and FMVSS No. 305's
electrical isolation requirements had not considered FCVs when they
were originally developed.\1\
---------------------------------------------------------------------------
\1\ FMVSS No. 305 currently contains a 500 ohms/volt electrical
isolation requirement, with isolation measured between the high
voltage propulsion battery and the chassis. FCVs are designed with
coolant loops to cool down very hot fuel cells during operation, and
the coolant tends to become more conductive of electrical current
over time, and able to convey electrical current to the vehicle
chassis; i.e., the conductivity of the coolant causes the vehicle to
be unable to maintain electrical isolation.
---------------------------------------------------------------------------
In order to bring FMVSS No. 305 back into line with the updates to
SAE J1766, the Alliance of Automobile Manufacturers (``the Alliance'')
petitioned NHTSA to conduct rulemaking to amend the requirements of
FMVSS No. 305 so that FCV manufacturers would know the performance
requirements required to comply with the FMVSSs and so that FCV
development could proceed without hindrance. NHTSA is issuing this NPRM
in order to promote our national policy goal of developing the hydrogen
FCV market consistent with the interests of safety. The agency
anticipates that current state-of-the-art FCVs, whether they contain AC
or DC high voltage systems, will be able to meet the requirements of
this proposed rule with virtually no design changes necessary.
II. Petitioner's Suggested Changes; NHTSA's Decisions on the Petition
In this section, the preamble sets forth the petition's many
suggested changes to FMVSS No. 305's requirements. These are marked in
bullet format, and are followed by NHTSA's response to each suggested
change. As will be discussed, NHTSA generally tentatively agrees with
most of the petitioner's suggestions. To the extent the agency does not
agree, the reasons for disagreeing are explained.
NHTSA generally concurs with the petitioner's suggested amendments
to FMVSS No. 305's requirements (except as noted) because the agency
tentatively concludes that the changes would achieve the policy
objective of aiding the development of the hydrogen FCV market
consistent with the interests of safety. NHTSA agrees with the
petitioner that not undertaking rulemaking could potentially interfere
with development of the FCV market, as FCV manufacturers are currently
uncertain of how to test electrical isolation in FCVs with liquid
coolant loops.\2\ An additional benefit of this
[[Page 57262]]
rulemaking becoming final would be closer harmonization with
international and voluntary industry consensus standards.
---------------------------------------------------------------------------
\2\ Under the current FMVSS No. 305, electrical isolation is
measured only between the high voltage propulsion battery and the
chassis, and functionally often ends up not being measured, because
there is typically no voltage to be found downstream of the
contactors that disconnect high voltage from the battery in the
event of a crash. The proposed FMVSS No. 305 would measure
electrical isolation between all high voltage sources and the
chassis, clarifying vehicle manufacturers' obligations in terms of
ensuring electrical isolation.
---------------------------------------------------------------------------
A. Fuel Cell Vehicles and FMVSS No. 305's Isolation Requirement
FMVSS No. 305 currently requires an electrical isolation of 500
ohms/volt.\3\ That isolation must be maintained between the vehicle's
propulsion battery and chassis after frontal, side, and rear crash
tests, and was based upon the shock hazard for alternating current
(AC). The standard does not distinguish between AC and DC (direct
current) types of electrical current. Also, the standard calculates
isolation values using voltage readings only between the propulsion
battery and the chassis, and not from other potential high voltage
sources that may cause a shock hazard, such as fuel cells. Fuel cells
and converters that change DC electrical current into AC to supply
propulsion motors used in some electric-motor vehicle designs are not
currently required to maintain electrical isolation from the chassis.
---------------------------------------------------------------------------
\3\ For the reader's reference, ohms are a measure of electrical
resistance, or how much the material of an electrical circuit
resists the flow of electricity (thus, a higher number indicates
more resistance), and volts are a measure of voltage, or how much
electrical potential there is between any two points in a circuit
(or, how much force is required to push the electrical current
through the circuit).
---------------------------------------------------------------------------
The petitioner states that the current 500 ohms/volt
isolation requirement of FMVSS No. 305's paragraph S5.3 is not
achievable for state-of-the-art FCVs, because they require a liquid
coolant to dissipate the heat generated in the fuel cell, and the
coolant itself is unavoidably an electrical conductor.\4\ The
petitioner argues that the updated SAE J1766 allowance for an isolation
level of 100 ohms/volt under certain defined conditions does not lower
the level of safety currently provided by FMVSS No. 305, because it is
well within the range of safety for DC current, and because the
provision ``* * * is directly tied to a requirement to continuously
monitor electrical isolation in service, with the obvious implication
that driver warnings and other appropriate remedial actions will be
taken if isolation drifts below the specified 100 ohms/volt level.''
---------------------------------------------------------------------------
\4\ SAE J1766 (rev. April 2005) states that ``The conductivity
of [the aqueous] coolant is a key factor in the isolation
characteristics of a fuel cell. Coolant conductance [of electrical
current] increases with time which decreases isolation.''
---------------------------------------------------------------------------
NHTSA's response: We are proposing to set the electrical isolation
for DC at 125 ohms/volt, not 100 ohms/volt.\5\ As noted above, FMVSS
No. 305 currently requires 500 ohms/volt electrical isolation, which
corresponds to 2 milliamps of body current for AC systems.\6\ To
produce the same physiological effects (at least, before the onset of
serious physical harm), the human body can withstand up to four times
the amount of DC as AC. Thus, the DC current corresponding to the
existing FMVSS No. 305 requirement for AC (2 milliamps) would be 2 x 4
= 8 milliamps DC current. 8 milliamps of current corresponds to 125
ohms/volt electrical isolation for DC, not 100 ohms/volt.\7\ This NPRM
thus proposes to set the electrical isolation for DC at 125 ohms/volt.
---------------------------------------------------------------------------
\5\ It should be remembered that electrical isolation (ohms/
volt) is a measure of a material's resistance to electrical current
passing through it: thus, a higher electrical isolation means that
less current passes through.
\6\ Based on Figure 1 in IEC-479, International Electrotechnical
Commission, Technical Report: Effects of current on human beings and
livestock--Part 1: General aspects (3rd ed., Sept. 1994). The agency
received this as part of a presentation included in the Alliance's
petition for rulemaking. Available for public viewing in the Office
of Crashworthiness Standards, National Highway Traffic Safety
Administration, 1200 New Jersey Avenue, SE., West Building,
Washington, DC 20590.
\7\ Based on Figure 2, id. The agency received this as part of a
presentation included in the Alliance's petition for rulemaking.
According to the same chart, 100 ohms/volt corresponds to 5 times
the amount of DC as AC, which is beyond the accepted range of
physical safety.
---------------------------------------------------------------------------
B. Test Procedure Measurement Values
The electrical isolation test procedure of FMVSS No. 305, contained
in S7.6, essentially consists of: (1) Identifying the propulsion
battery terminal that has the highest voltage differential between it
and the vehicle chassis; (2) inserting a resistor of known value
between that terminal and the vehicle chassis; and (3) measuring the
voltage difference between the vehicle chassis and the battery
terminal. With those measurements, the post-crash isolation resistance
is determined according to a formula provided in the standard.
The petitioner requested that FMVSS No. 305 be amended to
recognize voltages of less than 60 VDC or 30 VAC as an appropriate way
to provide electrical safety protection, as the revised SAE J1766
already does. The Alliance pointed out that most electric vehicle
designs use electrical contactors to disconnect high voltage from the
propulsion battery in the event of a crash or other loss of isolation.
Thus, they argued that the electrical isolation test procedure of FMVSS
No. 305 is inappropriate for such designs, because the voltage
differential between the high voltage system and the chassis would be
zero, which would put a zero in the denominator of the equation to
calculate isolation. The Alliance noted that FMVSS No. 305 does not
recognize the absence of voltage as evidence of electrical safety, and
therefore petitioned that the standard be revised to recognize voltages
of less than 60 VDC or 30 VAC as an appropriate way to provide
electrical safety protection.
NHTSA's response: We agree that FMVSS No. 305 is not explicit that
a voltage measurement of zero in the test procedure is evidence of
electrical safety. We tentatively agree that it would be evidence of
electrical safety, and are therefore proposing to change the test
requirement in S5.3 from ``electrical isolation'' to ``electrical
safety,'' so that ``electrical isolation'' becomes only one of the
alternative requirements for ``electrical safety,'' along with a
requirement that voltage between the vehicle chassis and the high
voltage source be less than 60 VDC or 30 VAC. We believe that these
changes would clarify the issue raised by the petitioner.
The petitioner noted that NHTSA had previously expressed
concern over the lack of a viable test procedure to test FCVs with
hydrogen, but emphasized the importance of proceeding with this
rulemaking in order not to hamper development of FCVs, and expressed
its view that the test procedure was a detail that could be worked out
later.
NHTSA's response: The problem of not having a viable test procedure
is that, for the safety of the testers, crash tests are generally
performed with vehicles left unfueled or fueled with a less volatile
alternative substance. However, FMVSS No. 305 and its formulas for
calculating electrical isolation require that an electrical output
measurement be available during the pretest and post-test phases of the
various crash tests. Fuel cells without hydrogen, or filled with
anything else,\8\ generate no electricity from which to measure
electrical output. A determination as to whether FMVSS No. 305 will
require further amendment to address FCV testing will await the results
of ongoing research, and will not be addressed in this rulemaking.
---------------------------------------------------------------------------
\8\ Such as helium, as suggested by SAE J2578, ``Recommended
Practice for General Fuel Cell Safety.''
---------------------------------------------------------------------------
C. Test Procedure Measurement Location on the Vehicle
FMVSS No. 305 (as well as previous versions of SAE J1766) currently
requires the measurement of electrical isolation in only one location,
between
[[Page 57263]]
the high voltage bus \9\ and the vehicle chassis. If a vehicle has
electrical contactors located within the battery pack, this single
measurement is taken between the downstream side of the contactor and
the vehicle chassis.
---------------------------------------------------------------------------
\9\ A high voltage bus (or bus-bar) is a distribution location
where multiple connections are made for the electrical circuits.
---------------------------------------------------------------------------
The petitioner requested that FMVSS No. 305 be amended to
mirror the revised SAE J1766, which specifies several electrical
isolation verification locations instead of just one: (1) Across the
high voltage bus bar; (2) between the high voltage source and the
vehicle chassis; (3) between the high voltage return and the vehicle
chassis; and (4) between the conductive energy storage device and the
vehicle chassis.
NHTSA's response: We are proposing to change and add several
definitions to FMVSS No. 305 in order to address this request. We agree
that measurements should be taken from all high voltage sources for
calculating electrical isolation from the vehicle chassis, because the
risk of electric shock can come from any high voltage source and not
just from the propulsion motor batteries. Additionally, we recognize
that some electric-powered vehicles may have both AC and DC high
voltage sources. Revised SAE J1766 added new definitions for energy
storage devices, which take into consideration the fact that ultra-
capacitors \10\ have replaced propulsion batteries in some electric-
powered vehicle designs.
---------------------------------------------------------------------------
\10\ Ultra-capacitors act like batteries in that they store
electrical energy and pose the same electrical safety hazards as
batteries, except for electrolyte spillage.
---------------------------------------------------------------------------
We therefore propose to add a new definition to S4 of FMVSS No.
305, to define ``high voltage source'' as either an electrical power-
generating device or an energy storage device that produces voltage
levels equal to or greater than 30 VAC or 60 VDC.\11\ Other proposed
changes to S4 include the addition of a definition for ``electrical
isolation,'' to reflect that isolation measurements are to be taken
between any high-voltage source and the vehicle's chassis; and the
deletion of the existing definition for ``battery system component''
and its replacement with a definition for ``energy storage system''
which includes ultra-capacitors, high voltage batteries, and their
associated hardware. Several other sections of FMVSS No. 305 would also
be amended to reflect the changes proposed above.
---------------------------------------------------------------------------
\11\ We note that unlike SAE J1766, which specifies ``high-
voltage systems'' as greater than 60 VDC or 30 VAC, ECE R.100
specifies high-voltage systems as greater than 60 VDC or 25 VAC. The
AC high voltage value may eventually change in the final rule to
make the definition consistent, pending the development of an
internationally-consistent definition of high-voltage system through
a global technical regulation (see discussion in Section III below,
``International Harmonization'').
---------------------------------------------------------------------------
D. Setting 0.2 Joules as an Appropriate Low Energy Threshold
The petitioner requested that FMVSS No. 305 also be
amended to mirror revised SAE J1766 insofar as that standard specifies
an energy level below 0.2 joules as another appropriate way to provide
electrical safety protection. The petitioner noted that the 0.2 joules
of energy value specified in SAE J1766 was derived using data from the
IEC 479-1 charts, and is non-harmful.\12\ The petitioner also noted for
comparison that static electricity, which can involve voltages of more
than 10,000 volts, is nevertheless benign to human health due to the
low current and short durations associated with discharge.
---------------------------------------------------------------------------
\12\ This was based on 200 mA of current, with a duration of 10
ms and a voltage of 200V with a safety factor of 2.
---------------------------------------------------------------------------
NHTSA's response: We are seeking comments on the inclusion of 0.2
joules as an appropriate low energy threshold in FMVSS No. 305 to
reflect that low amounts of electrical energy are acceptable. The
agency remains less than fully convinced of the need for this
amendment. The SAE's methodology, assuming a 10 ms duration of contact,
does not seem realistic in the context of an automobile crash, and in
fact would be much more typical as a result of static buildup than a
fault contact with a high voltage electrical system after a crash.
Additionally, NHTSA is concerned about the practicality of
measuring a mere 0.2 joules of energy in a crash test environment.
Comment to help the agency resolve this issue is requested.
E. Harmonizing FMVSS No. 305's Rear Impact Test Procedure With FMVSS
No. 301
The original version of FMVSS No. 305 \13\ incorporated the rear
moving barrier test of FMVSS No. 301, Fuel System Integrity, which at
the time was a 30 mph (48 km/h) test. In a 2004 final rule, response to
petitions for reconsideration on FMVSS No. 301,\14\ the agency amended
FMVSS No. 305 to give manufacturers the option of conducting either a
rigid moving barrier 48-km/h test, or an upgraded-FMVSS No. 301 moving
deformable barrier 80-km/h test. We stated that:
---------------------------------------------------------------------------
\13\ The final rule promulgating FMVSS No. 305 is available at
65 FR 57980-57992 (Sept. 27, 2000).
\14\ 69 FR 51393 (Aug. 19, 2004).
Prior to the upgrade of the FMVSS No. 301 rear moving barrier
impact test, compliance with the FMVSS Nos. 301 and 305 rear moving
barrier requirements was based on similar test conditions and
procedures. The similarity in test conditions gave manufacturers of
gas-electric hybrid vehicles the opportunity to conduct one test
instead of two to determine compliance with the two sets of rear
impact requirements. Gas-electric hybrid vehicles with a GVWR of
4,536 kg or less are subject to the rear moving impact requirements
of both FMVSS Nos. 301 and 305, if they use both liquid fuel and
more than 48 nominal volts of electricity as propulsion power. As a
result of the FMVSS No. 301 upgrade, compliance with the FMVSS Nos.
301 and 305 rear moving barrier requirements is no longer based on
similar test conditions and procedures. The differences in the
conditions and procedures could eliminate the opportunity to conduct
one test instead of two for gas-electric hybrid vehicles. To
reinstate the opportunity to conduct two tests instead of one, we
are amending FMVSS No. 305 to permit compliance with the electrolyte
spillage, battery retention and electrical isolation rear moving
barrier impact requirements of FMVSS No. 305 under the upgraded
FMVSS No. 301 rear moving barrier test conditions.\15\
---------------------------------------------------------------------------
\15\ Id., at 51396.
The petitioner requested that the rear impact test speed
of FMVSS No. 305 should be amended to correspond with the 80 km/h speed
now required by FMVSS No. 301. The petitioner also stated that this
would align FMVSS No. 305 with the recently amended Canadian Motor
Vehicle Safety Standard 305, which requires the 80 km/h speed for
vehicles produced after September 1, 2009.
NHTSA's response: We are proposing to amend FMVSS No. 305 to
specify only the 80 km/h test. NHTSA agrees that the rear test speed
for FMVSS No. 305 should reflect the speed required in FMVSS No. 301,
which is currently being phased in and will be required for all
vehicles with liquid fuel systems manufactured after September 1, 2009.
As noted by the Alliance, this change would also facilitate
harmonization with Canadian Standard 305. Therefore, NHTSA proposes to
amend FMVSS No. 305 to specify only the 80 km/h rear impact test, with
S6.2 and S7.4 changed accordingly.
III. International Harmonization
As long as safety is preserved, NHTSA believes that the same
voltage should be used worldwide to denote high voltage systems,
because vehicle manufacturers (and ultimately, consumers) can expect to
achieve cost savings through the harmonization of different sets of
standards. However, NHTSA is not ready just yet to harmonize fully with
other international standards. Globally, there are several existing
regulations and standards that pertain to high voltage systems in
electric-powered
[[Page 57264]]
motor vehicles. The agency has been collaborating with the
international community to develop a global technical regulation (GTR)
for hydrogen-powered motor vehicles through its active participation in
the United Nations World Forum for the Harmonization of Vehicle
Regulations (WP.29). It has been agreed by WP.29 that a GTR be
developed for hydrogen-powered motor vehicles. The United States,
Germany, and Japan as sponsors have completed development of an action
plan that outlines the key safety areas of hydrogen and FCVs for the
GTR. The definition of high voltage systems in automobiles would likely
be part of the development of this GTR.
The existing requirements in the European regulation, ECE R.100,
``Uniform provisions concerning the approval of battery electric
vehicles with regard to specific requirements for the construction,
functional safety and hydrogen emission,'' specify that battery-powered
electric vehicles must maintain 500 ohms/volt electrical isolation
between the propulsion battery and the vehicle chassis. This is similar
to the requirement in FMVSS No. 305. NHTSA is aware that the ECE is
currently considering changing this requirement to meet a 100 ohms/volt
electrical isolation between the high voltage system and the vehicle
chassis, without distinguishing between AC (greater than 25 volts) or
DC (greater than 60 volts) electrical current. The ECE's draft
amendments also allow for up to 10 milliamps of continuous electrical
current or 100 ohms/volt of resistance. NHTSA has also examined the
recent Japanese regulation TRIAS 11-1-4-101, ``Technical Standard for
Protection of Occupants Against High Voltage in Fuel Cell Vehicles,''
which requires 100 ohms/volt electrical isolation between the chassis
and the high-voltage system of those vehicles whose operating voltage
is greater than 60 VDC.
Despite our interest in international harmonization, NHTSA does not
believe that allowing 10 milliamps of continuous electrical current is
sufficiently safe. Even for a duration of 2 seconds, 10 milliamps of AC
electrical current could result in a reversible disturbance in the
heart (such as atrial fibrillation and transient cardiac arrest without
ventricular fibrillation).\16\ Because of this, NHTSA is not proposing
any changes to the existing isolation requirements for AC high voltage
sources. Similarly, NHTSA does not believe that a change from the
existing ECE requirement of 500 ohms/volt isolation to a requirement of
100 ohms/volt isolation, without distinguishing between AC and DC
current, would be consistent with the best interests of safety.
Additionally, neither the Alliance petition nor the revised SAE J1766
recommend any changes to the existing requirement of 500 ohms/volt
isolation between AC high voltage sources and the chassis. Public
comment is requested on the above values for electrical isolation and
continuous current.
---------------------------------------------------------------------------
\16\ IEC 479-1, Table 4--Time/current zones for a.c. 15 Hz to
100 Hz, p. 41.
---------------------------------------------------------------------------
IV. The Proposed Rule
A. Amending FMVSS No. 305 To Accommodate Fuel Cell Vehicles
This NPRM proposes to amend FMVSS No. 305 by revising certain
sections in order to realign the standard with the April 2005 update of
SAE J1766 that was changed to accommodate fuel cell vehicles and avoid
hindering the development of that market. The following points
highlight the key provisions of the proposed requirements:
The NPRM would change the applicability of FMVSS No. 305
to accommodate state-of-the-art FCVs that use 60 VDC or 30 VAC or more
for propulsion power instead of the existing 48 nominal volts.
The NPRM would distinguish between isolation values for DC
and AC currents, setting the value for DC high-voltage systems at 125
ohms/volt.
The NPRM would accommodate current FCV technology by
changing the test requirement in S5.3 from ``electrical isolation''
alone to ``electrical safety,'' which would also include an alternative
requirement that the voltage between the high-voltage source and the
vehicle chassis be less than 60 VDC or 30 VAC.
The NPRM would add a definition for ``high-voltage
source,'' and amend the definition for ``electrical isolation'' to
reflect that isolation measurements shall be taken from any high-
voltage source and the vehicle's chassis, instead of from only one
location.
The NPRM would harmonize S6.2 and S7.4 of FMVSS No. 305
with the revised FMVSS No. 301, as regards rear moving barrier impact
test conditions.
B. Effective Date
NHTSA here proposes that the effective date of this rulemaking
apply to vehicles manufactured one year after the final rule is
published, with optional early compliance. The agency believes that one
year should be sufficient for manufacturers to verify that they can
meet the new electrical isolation requirements, particularly since
similar requirements already exist as a SAE recommended practice.
Currently, all manufacturers of electric-powered vehicles already
isolate the high voltage sources from the vehicle chassis.
IV. Benefits/Costs
NHTSA anticipates no quantifiable economic or fatality-reduction
benefits from this proposed rule. The update to FMVSS No. 305
represents an increase in the stringency of the level of safety
provided by the standard for FCVs that are currently in development but
not yet on the roads. Because the safety benefits will be in the
future, they are not currently quantifiable. Immediate benefits that
will likely accrue are primarily of a policy nature: That the hydrogen
FCV market will not be hindered in its continuing development, as the
petitioner asserted; that various small inconsistencies that have
lingered in the standard will be corrected; and so forth.
NHTSA believes that the cost associated with this rulemaking would
be negligible. Any added cost would consist only of what was involved
in taking additional readings at different test points within vehicles
that have both AC and DC power systems. Moreover, the vehicle
manufacturers potentially affected by this proposed rule were involved
in the update of SAE J1766 (which was revised to accommodate their
current FCV designs), and are presumably already complying with that
standard, so the additional cost of compliance with the proposed rule
should be de minimis if not zero.
VI. Public Participation
How Do I Prepare and Submit Comments?
Your comments must be written and in English. To ensure that your
comments are filed correctly in the Docket, please include the docket
number of this document in your comments.
Your comments must not be more than 15 pages long (see 49 CFR
553.21). We established this limit to encourage you to write your
primary comments in a concise fashion. However, you may attach
necessary additional documents to your comments. There is no limit on
the length of the attachments.
Please submit two copies of your comments, including the
attachments, to Docket Management at the address given under ADDRESSES.
You may also submit your comments to the docket electronically by
logging onto the Dockets Management System website at https://
dms.dot.gov. Click on
[[Page 57265]]
``Help & Information,'' or ``Help/Info'' to obtain instructions for
filing the document electronically.
How Can I Be Sure That My Comments Were Received?
If you wish Docket Management to notify you upon its receipt of
your comments, enclose a self-addressed, stamped postcard in the
envelope containing your comments. Upon receiving your comments, Docket
Management will return the postcard by mail.
How Do I Submit Confidential Business Information?
If you wish to submit any information under a claim of
confidentiality, you should submit three copies of your complete
submission, including the information you claim to be confidential
business information, to the Chief Counsel, NHTSA, at the address given
above under FOR FURTHER INFORMATION CONTACT. In addition, you should
submit two copies, from which you have deleted the claimed confidential
business information, to Docket Management at the address given above
under ADDRESSES. When you send a comment containing information claimed
to be confidential business information, you should include a cover
letter setting forth the information specified in our confidential
business information regulation (49 CFR part 512).
Will The Agency Consider Late Comments?
We will consider all comments that Docket Management receives
before the close of business on the comment closing date indicated
above under DATES. To the extent possible, we also will consider
comments that Docket Management receives after that date. If Docket
Management receives a comment too late for us to consider it in
developing the final rule, we will consider that comment as an informal
suggestion for future rulemaking action.
How Can I Read The Comments Submitted By Other People?
You may read the comments received by Docket Management at the
address given under ADDRESSES. The hours of the Docket are indicated
above in the same location.
You also may see the comments on the Internet. To read the comments
on the Internet, go to https://www.regulations.gov, and follow the
instructions for accessing the Docket.
Please note that even after the comment closing date, we will
continue to file relevant information in the Docket as it becomes
available. Further, some people may submit late comments. Accordingly,
we recommend that you periodically check the Docket for new material.
VII. Rulemaking Analyses and Notices
A. Executive Order 12866 and DOT Regulatory Policies and Procedures
This rulemaking document was not reviewed by the Office of
Management and Budget under E.O. 12866. It is not considered to be
significant under E.O. 12866 or the Department's Regulatory Policies
and Procedures (44 FR 11034; Feb. 26, 1979). This proposed rule should
have no significant effect on the national economy, and simply
clarifies for FCV manufacturers their obligations under FMVSS No. 305.
B. Regulatory Flexibility Act
Pursuant to the Regulatory Flexibility Act (5 U.S.C. 601 et seq.,
as amended by the Small Business Regulatory Enforcement Fairness Act
(SBREFA) of 1996), whenever an agency is required to publish a notice
of rulemaking for any proposed or final rule, it must prepare and make
available for public comment a regulatory flexibility analysis that
describes the effect of the rule on small entities (i.e., small
businesses, small organizations, and small governmental jurisdictions).
The Small Business Administration's regulations at 13 CFR part 121
define a small business, in part, as a business entity ``which operates
primarily within the United States.'' (13 CFR 121.105(a)). No
regulatory flexibility analysis is required if the head of an agency
certifies the rule will not have a significant economic impact on a
substantial number of small entities. SBREFA amended the Regulatory
Flexibility Act to require Federal agencies to provide a statement of
the factual basis for certifying that a rule will not have a
significant economic impact on a substantial number of small entities.
NHTSA has considered the effects of this proposed rule under the
Regulatory Flexibility Act. I certify that this proposed rule would not
have a significant economic impact on a substantial number of small
entities. Any small manufacturers that might be affected by this
proposed rule are already subject to the requirements of FMVSS No. 305,
and the testing costs added by this proposed rule are anticipated to be
extremely small. Therefore, there should be only a very minor economic
impact, if any.
C. Executive Order 13132 (Federalism)
NHTSA has examined today's final rule pursuant to Executive Order
13132 (64 FR 43255, August 10, 1999) and concluded that no additional
consultation with States, local governments or their representatives is
mandated beyond the rulemaking process. The agency has concluded that
the rule does not have federalism implications because the rule does
not have ``substantial direct effects on the States, on the
relationship between the national government and the States, or on the
distribution of power and responsibilities among the various levels of
government.''
Further, no consultation is needed to discuss the preemptive effect
of today's rule. NHTSA rules can have preemptive effect in at least two
ways. First, the National Traffic and Motor Vehicle Safety Act contains
an express preemptive provision: ``When a motor vehicle safety standard
is in effect under this chapter, a State or a political subdivision of
a State may prescribe or continue in effect a standard applicable to
the same aspect of performance of a motor vehicle or motor vehicle
equipment only if the standard is identical to the standard prescribed
under this chapter.'' 49 U.S.C. 30103(b)(1). It is this statutory
command that preempts State law, not today's rulemaking, so
consultation would be inappropriate.
In addition to the express preemption noted above, the Supreme
Court has also recognized that State requirements imposed on motor
vehicle manufacturers, including sanctions imposed by State tort law,
can stand as an obstacle to the accomplishment and execution of a NHTSA
safety standard. When such a conflict is discerned, the Supremacy
Clause of the Constitution makes their State requirements
unenforceable. See Geier v. American Honda Motor Co., 529 U.S. 861
(2000). NHTSA has not outlined such potential State requirements in
today's rulemaking, however, in part because such conflicts can arise
in varied contexts, but it is conceivable that such a conflict may
become clear through subsequent experience with today's standard and
test regime. NHTSA may opine on such conflicts in the future, if
warranted. See id. at 883-86.
D. National Environmental Policy Act
NHTSA has analyzed this rulemaking action for the purposes of the
National Environmental Policy Act. The agency has determined that
implementation of this action will not have any significant
[[Page 57266]]
impact on the quality of the human environment.
E. Executive Order 12988 (Civil Justice Reform)
With respect to the review of the promulgation of a new regulation,
section 3(b) of Executive Order 12988, ``Civil Justice Reform'' (61 FR
4729, February 7, 1996) requires that Executive agencies make every
reasonable effort to ensure that the regulation: (1) Clearly specifies
the preemptive effect; (2) clearly specifies the effect on existing
Federal law or regulation; (3) provides a clear legal standard for
affected conduct, while promoting simplification and burden reduction;
(4) clearly specifies the retroactive effect, if any; (5) adequately
defines key terms; and (7) addresses other important issues affecting
clarity and general draftsmanship under any guidelines issued by the
Attorney General. This document is consistent with that requirement.
Pursuant to this Order, NHTSA notes as follows. The preemptive
effect of this rule is discussed above. NHTSA notes further that there
is no requirement that individuals submit a petition for
reconsideration or pursue other administrative proceeding before they
may file suit in court.
F. Privacy Act
Please note that anyone is able to search the electronic form of
all comments received into any of our dockets by the name of the
individual submitting the comment (or signing the comment, if submitted
on behalf of an association, business, labor union, etc.). You may
review DOT's complete Privacy Act Statement in the Federal Register
published on April 11, 2000 (Volume 65, Number 70; Pages 19477-78), or
you may visit https://DocketInfo.dot.gov.
G. Paperwork Reduction Act
Under the Paperwork Reduction Act of 1995 (PRA), a person is not
required to respond to a collection of information by a Federal agency
unless the collection displays a valid OMB control number. There are no
information collection requirements associated with this NPRM, nor
would there be information collection requirements if this proposed
rule were to be made final.
H. National Technology Transfer and Advancement Act
Section 12(d) of the National Technology Transfer and Advancement
Act of 1995 (NTTAA), Public Law 104-113 (15 U.S.C. 272) directs the
agency to evaluate and use voluntary consensus standards in its
regulatory activities unless doing so would be inconsistent with
applicable law or is otherwise impractical. Voluntary consensus
standards are technical standards (e.g., materials specifications, test
methods, sampling procedures, and business practices) that are
developed or adopted by voluntary consensus standards bodies, such as
the Society of Automotive Engineers (SAE). The NTTAA directs us to
provide Congress (through OMB) with explanations when the agency
decides not to use available and applicable voluntary consensus
standards. The NTTAA does not apply to symbols.
FMVSS No. 305 has historically drawn largely from SAE J1766, and
does so again for this current rulemaking, which updates FMVSS No. 305
based on a recent updating of SAE J1766. NHTSA is not, however,
adopting SAE J1766 verbatim, for the reasons discussed in Section C(1)
above, and is proposing an isolation level of 125 ohms/volt instead of
100 ohms/volt for DC current. The agency believes that this will best
avoid reducing the safety benefits of FMVSS No. 305 as it is currently
written.
NHTSA requests public comment on the appropriateness of also
considering the 2006 International Organization for Standardization
(ISO) standard ISO 23273-3, ``Fuel cell road vehicles--Safety
specifications--Part 3: Protection of persons against electric shock.''
List of Subjects in 49 CFR Part 565
Imports, Motor vehicles, Motor vehicle safety, and Tires.
In consideration of the foregoing, NHTSA proposes to amend 49 CFR
Part 571.305 as follows:
PART 571--FEDERAL MOTOR VEHICLE SAFETY STANDARDS
1. The authority citation for part 571 continues to read as
follows:
Authority: 49 U.S.C. 322, 30111, 30115, 30117, and 30166;
delegation of authority at 49 CFR 1.50.
2. Amend Sec. 571.305 by revising S1, S2, S3, S4, S5.2, S5.3,
S6.2, S7, S7.1, S7.2, S7.4, S7.6, S7.6.1, S7.6.2, S7.6.3, S7.6.4,
S7.6.5, S7.6.6, and S7.6.7 to read as follows:
Sec. 571.305 Standard No. 305; Electric-powered vehicles: Electrolyte
spillage and electrical shock protection.
S1 Scope. This standard specifies requirements for limitation of
electrolyte spillage, retention of energy storage devices, and
protection from harmful electric shock during and after a crash.
S2 Purpose. The purpose of this standard is to reduce deaths and
injuries during a crash which occur because of electrolyte spillage
from energy storage devices, intrusion of energy storage device system
components into the occupant compartment, and electrical shock.
S3 Application. This standard applies to passenger cars, and to
multipurpose passenger vehicles, trucks and buses with a GVWR of 4536
kg or less, that use more than 60 volts direct current (VDC) or 30
volts alternating current (VAC) of electricity as propulsion power and
whose speed attainable over a distance of 1.6 km on a paved level
surface is more than 40 km/h.
S4 Definitions.
Dummy means a 50th percentile male test dummy as specified in
subpart F of part 572 of this chapter.
Electrical isolation means the electrical resistance between the
vehicle high-voltage source and any vehicle conductive structure.
Energy storage system means the components comprising, but not
limited to, the vehicle's high-voltage battery system or capacitor
system. These include, but are not limited to, the battery or capacitor
modules, interconnects, venting systems, battery or capacitor restraint
devices, and energy storage boxes or containers that hold the
individual battery or capacitor modules.
High-voltage source means any item that produces voltage levels
equal to or greater than 30 VAC or 60 VDC.
VAC means volts of alternating current (AC).
VDC means volts of direct current (DC).
* * * * *
S5.2 Energy storage device retention. Energy storage system modules
located inside the passenger compartment must remain in the location in
which they are installed. Any energy storage system component that is
located outside the passenger compartment must not enter the passenger
compartment during the test procedures of S6 of this standard, as
determined by visual inspection.
S5.3 Electrical safety. After each test, electrical isolation and
energy between any high-voltage source and the vehicle chassis
electricity-conducting structure must meet the following:
(a) For AC high-voltage systems, electrical isolation is not less
than 500 ohms/volt; or
[[Page 57267]]
(b) For DC high-voltage systems, electrical isolation is not less
than 125 ohms/volt.
* * * * *
S6.2 Rear moving barrier impact. The vehicle must meet the
requirements of S5.1, S5.2, and S5.3 when it is impacted from the rear
by a barrier that conforms to S7.3(b) of Sec. 571.301 of this chapter
and that is moving at any speed up to and including 80 km/h (50 mph)
with dummies positioned in accordance with S6.2 of Sec. 571.301 of this
chapter.
* * * * *
S7 Test conditions. When the vehicle is tested according to S6, the
requirements of S5 must be determined by the conditions specified in
S7.1 through S7.6.7. All measurements for calculating electrical
isolation or the amount of electrical energy will be made after a
minimum of 5 seconds immediately after the tests specified in S6. Where
a range is specified, the vehicle must be capable of meeting the
requirements at all points within the range.
S7.1 Energy storage device state of charge. The energy storage
device is at the level specified in the following paragraphs (a), (b),
or (c), as appropriate:
(a) At the maximum state of charge recommended by the manufacturer,
as stated in the vehicle operator's manual or on a label that is
permanently affixed to the vehicle;
(b) If the manufacturer has made no recommendation, at a state of
charge of not less than 95 percent of the maximum capacity of the
energy storage device; or
(c) If the energy storage device(s) are rechargeable only by an
energy source on the vehicle, at any state of charge within the normal
operating voltage, as defined by the vehicle manufacturer.
S7.2 Vehicle conditions. The switch or device that provides power
from the high-voltage system to the propulsion motor(s) is in the
activated position or the ready-to-drive position.
* * * * *
S7.4 Rear moving barrier impact test conditions. In addition to the
conditions of S7.1 and S7.2, the conditions of S7.5 and S7.6 of Sec.
571.301 of this chapter apply to the conducting of the rear moving
deformable barrier impact test specified in S6.2.
* * * * *
S7.6 Electrical isolation test procedure. In addition to the
conditions of S7.1 and S7.2, the conditions in S7.6.1 through S7.6.7
apply to the measuring of electrical isolation specified in S5.3.
S7.6.1 Prior to any barrier impact test, the high-voltage system is
connected to the vehicle's propulsion system, and the vehicle ignition
is in the ``on'' (traction (propulsion) system energized) position. If
the vehicle utilizes an automatic disconnect between the high-voltage
system and the traction system that is physically contained within the
high-voltage system, the electrical isolation measurement after the
test is made from the traction system side of the automatic disconnect
to the vehicle chassis. If the vehicle utilizes an automatic disconnect
that is not physically contained within the high-voltage system, the
electrical isolation measurement after the impact is made from the
high-voltage source side of the automatic disconnect to the vehicle
chassis.
S7.6.2 The voltmeter used in this test has an internal resistance
of at least 10 M[OHgr].
S7.6.3 The voltage(s) is/are measured as shown in Figure 1 and the
high-voltage source voltage(s) (Vb) is/are recorded. Before any vehicle
impact test, Vb is equal to or greater than the nominal operating
voltage as specified by the vehicle manufacturer.
S7.6.4 The voltage(s) is/are measured as shown in Figure 2, and the
voltage(s) (V1) between the negative side of the high-voltage source
and the vehicle chassis is/are recorded.
S7.6.5 The voltage(s) is/are measured as shown in Figure 3, and the
voltage(s) (V2) between the positive side of the high-voltage source
and the vehicle chassis is/are recorded.
S7.6.6 If V1 is greater than or equal to V2, insert a known
resistance (Ro) between the negative side of the high-voltage source
and the vehicle chassis. With the Ro installed, measure the voltage
(V1') as shown in Figure 4 between the negative side of the high-
voltage source and the vehicle chassis. Calculate the electrical
isolation (Ri) according to the formula shown.
S7.6.7 If V2 is greater than V1, insert a known resistance (Ro)
between the positive side of the high-voltage source and the vehicle
chassis. With the Ro installed, measure the voltage and record the
voltage (V2') between the positive side of the high-voltage source and
the vehicle chassis as shown in Figure 5. Calculate the electrical
isolation (Ri) according to the formula shown.
* * * * *
3. Further amend Sec. 571.305 by revising Figures 1, 2, 3, 4, and
5 following S7.6.7 to read as follows:
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Issued: October 2, 2007.
Stephen R. Kratzke,
Associate Administrator for Rulemaking.
[FR Doc. E7-19735 Filed 10-5-07; 8:45 am]
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