Michigan Administrative Code
Department - Labor and Economic Opportunity
MIOSHA
General Industry and Construction Safety and Occupational Health Standards
General Industry Safety Standards
Part 33 - PERSONAL PROTECTIVE EQUIPMENT
ELECTRICAL PROTECTIVE EQUIPMENT
Section R. 408.13387 - Design requirements for specific types of electrical protective equipment

Universal Citation: MI Admin Code R. 408.13387

Current through Vol. 24-16, September 15, 2024

Rule 3387.

(1) Rubber insulating blankets, rubber insulating matting, rubber insulating covers, rubber insulating line hose, rubber insulating gloves, and rubber insulating sleeves shall meet the following requirements:

(a) Blankets, gloves, and sleeves shall be produced by a seamless process.

(b) Each item shall be clearly marked as follows:

(i) Class 00 equipment shall be marked class 00.

(ii) Class 0 equipment shall be marked class 0.

(iii) Class 1 equipment shall be marked class 1.

(iv) Class 2 equipment shall be marked class 2.

(v) Class 3 equipment shall be marked class 3.

(vi) Class 4 equipment shall be marked class 4.

(vii) Non-ozone-resistant equipment shall be marked type I.

(viii) Ozone-resistant equipment shall be marked type II.

(ix) Other relevant markings, such as the manufacturers identification and the size of the equipment, may also be provided.

(c) Markings shall be non-conducting and shall be applied in such a manner as not to impair the insulating qualities of the equipment.

(d) Markings on gloves shall be confined to the cuff portion of the glove.

(2) Electrical requirements shall be all of the following:

(a) Equipment shall be capable of withstanding the alternating current proof-test voltage specified in Table A or the direct current proof-test voltage specified in Table B. All of the following apply:

(i) The proof test shall reliably indicate that the equipment can withstand the voltage involved.

(ii) The test voltage shall be applied continuously for 3 minutes for equipment other than matting and shall be applied continuously for 1 minute for matting.

(iii) Gloves shall be capable of separately withstanding the alternating current proof-test voltage specified in Table A after a 16-hour water soak.

(b) When the alternating current proof test is used on gloves, the 60-hertz proof-test current shall not exceed the values specified in Table A at any time during the test period. All of the following apply:

(i) If the alternating current proof test is made at a frequency other than 60 hertz, the permissible proof-test current shall be computed from the direct ratio of the frequencies.

(ii) For the test, gloves(right side out) shall be filled with tap water and immersed in water to a depth that is in accordance with Table C. Water shall be added to or removed from the glove, as necessary, so that the water level is the same inside and outside the glove.

(iii) After the 16-hour water soak specified in this subrule, the 60-hertz proof-test current shall not exceed the values given in Table A by more than 2 milliamperes.

(c) Equipment that has been subjected to a minimum breakdown voltage test shall not be used for electrical protection. See subrule (3) of this rule.

(d) Material used for Type II insulating equipment shall be capable of withstanding an ozone test, with no visible effects. The ozone test shall reliably indicate that the material will resist ozone exposure in actual use. Any visible signs of ozone deterioration of the material, such as checking, cracking, breaks, or pitting, is evidence of failure to meet the requirements for ozone-resistant material. See subrule (3) of this rule.

(3) Workmanship and finish shall comply with both of the following:

(a) Equipment shall be free of physical irregularities that can adversely affect the insulating properties of the equipment and that can be detected by the tests or inspections required by these rules.

(b) Surface irregularities that may be present on all rubber goods, because of imperfections on forms or molds or because of inherent difficulties in the manufacturing process, and that may appear as indentations, protuberances, or imbedded foreign material are acceptable under the following conditions:

(i) The indentation or protuberance blends into a smooth slope when the material is stretched.

(ii) Foreign material remains in place when the insulating material is folded and stretches with the insulating material surrounding it.

(4) Rubber insulating equipment meeting the national consensus standards in Table 4 is considered to be in compliance with the performance requirements of these rules.

TABLE 2 AMERICAN SOCIETY OF TESTING MATERIALS STANDARDS
STANDARD TITLE	ASTM NUMBER	EDITION	SUPPLEME NT
Standard Specification for Rubber Insulating Gloves	D-120	2009	-
Standard Specification for Rubber Insulating Matting	D-178	2001	2010
Standard Specification for Rubber Insulating Blankets	D-1048	2012	-
Standard Specification for Rubber Insulating Covers	D-1049	1998	2010
Standard Specification for Rubber Insulating Line Hose	D-1050	2005	2011
Standard Specification for Rubber Insulating Sleeves	D-1051	2008	-
These standards contain specifications for conducting the various tests required in these rules. For example, the alternating current and direct current proof tests, the breakdown test, the water-soak procedure, and the ozone test described in this rule are described in detail in these ASTM standards.
ASTM F-1236 "Standard Guide for Visual Inspection of Electrical Protective Rubber Products," 1996 Edition with 2012 supplement, as adopted in R 408.13301a, presents methods and techniques for the visual inspection of electrical protective equipment made of rubber. This guide also contains descriptions and photographs of irregularities that can be found in this equipment
ASTM F-819 "Standard Terminology Relating to Electrical Protective Equipment for Workers," 2010 edition, as adopted in R 408.13301a, includes definitions of terms relating to the electrical protective equipment covered in these rules.

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