Current through Register 2024 Notice Reg. No. 38, September 20, 2024
(a) Safety Fuse Initiation System.
(1) Safety fuses shall not be ignited before
explosive charges are in place.
EXCEPTION: Avalanche blasting.
(2) When blasting with safety fuse,
consideration shall be given to the following:
(A) the length and burning rate of the
fuse;
(B) the condition of the
escape route; and,
(C) the distance
to a place of safety.
(3)
Safety fuses shall not be used in any location, such as a shaft, raise or winz,
where the lack of adequate nearby shelter and the distance of travel to a place
of safety is such that there is a hazard to employees from flying rock and
concussion.
(4) All safety fuses
shall be cut sufficiently long to extend beyond the collar of the hole and in
no case shall they be less than 3 feet in length.
NOTE: At the usual rate of burning, a 3-foot length of
safety fuse will fire a shot in about 2 minutes.
(5) Only single shots shall be fired when
using 3-foot safety fuses. If more than one fuse is to be lighted at one time,
such fuses shall comply with subsection (6) of this section.
(6) When lighting safety fuse, the fuses
shall be so timed that no charge will detonate until at least 2 minutes after
the last fuse in the blast area has been ignited.
(7) No one employee shall be permitted to
ignite more than 12 safety fuses in succession. When 2 or more safety fuses in
a group are lighted as one, by means of igniter cord or other fuse-lighting
device, they may be considered as one fuse for the purpose of the
subsection.
(8) If more than 3
safety fuses are lighted at one time, no person shall be permitted to enter the
blast area until after a period of time equal to 2 minutes for each foot in the
length of the longest fuse in the round or 15 minutes, whichever is the longest
time.
(9) At least two employees
shall be present when lighting fuses.
EXCEPTION: Avalanche blasting.
(10) Fuses shall be lit with devices approved
for such purposes.
(b)
Shock Tube Initiation System.
(1) Connections
with other initiation devices shall be secured in a manner which provides for
uninterrupted propagation;
(2)
Factory-made units shall be used as assembled and shall not be cut except that
a single splice is permitted on the lead-in trunkline during dry conditions;
and
(3) Connections between blast
holes shall not be made until immediately prior to clearing the blast site when
surface delay detonators are used.
1.
Amendment of section heading and section and new NOTE filed 9-24-97; operative
10-24-97 (Register 97, No. 39).
2. Repealer and new section heading
and amendment of section filed 7-11-2003; operative 8-10-2003 (Register 2003,
No. 28).
Note: Authority cited: Section
142.3, Labor
Code. Reference: Section
142.3, Labor
Code.
