Source: https://www.federalregister.gov/documents/2003/05/30/03-13498/definition-for-multipurpose-dry-chemical-fire-extinguisher
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Federal Register :: Definition for Multipurpose Dry-Chemical Fire Extinguisher
A Rule by the Mine Safety and Health Administration on 05/30/2003
https://www.federalregister.gov/d/03-13498 https://www.federalregister.gov/d/03-13498
This technical amendment moves the definition for multipurpose dry-chemical fire extinguisher in subparts C and E of 30 CFR parts 56 and 57 to the general definitions section in subpart A of these parts. This action is necessary to eliminate confusion regarding compliance with the requirements for multipurpose dry-chemical fire extinguishers caused by it having two definitions, one in subpart A and a different one in subparts C and E.
Marvin W. Nichols, Director; Office of Standards, Regulations, and Variances, MSHA; Phone: (202) 693-9440; FAX: (202) 693-9441; E-mail: nichols-marvin@msha.gov.
The definition for multipurpose dry-chemical fire extinguisher in subpart A of existing 30 CFR 56/57.2 states—
In 1985, MSHA promulgated a final rule [50 FR 4022] revising its “Fire Prevention and Control” standards for metal and nonmetal mines in subpart C of 30 CFR parts 56 and 57. The definition for multipurpose dry-chemical fire extinguisher in final §§ 56/57.4000 states—
In 1991, MSHA promulgated a final rule [56 FR 46508] revising its “Explosives” standards for metal and nonmetal mines in subpart E of 30 CFR parts 56 and 57. The definition for multipurpose dry-chemical fire extinguisher in final §§ 56/57.6000 of “Subpart E—Explosives” is identical to that contained in §§ 56/57.4000 of “Subpart C—Fire Prevention and Control.”
With the publication of the final rules for “Subpart C—Fire Prevention and Control” and “Subpart E—Explosives,” the definition for multipurpose dry-chemical fire extinguisher in subpart A became irrelevant because this term is used only in subparts C and E.
The definition for multipurpose dry-chemical fire extinguisher in subpart A (§§ 56/57.2) differs from the one in subpart C (§§ 56/57.4000) and subpart E (§§ 56/57.6000) in two ways. First, the definition in subpart A uses the word “minimum” instead of “nominal” in characterizing the amount of dry-chemical agent required. The preamble to the final rule for “Subpart C—Fire Prevention and Control,” however, states that—
* * * Because fire equipment manufacturers designate the weight of dry-chemical agent in an extinguisher by “nominal” weight rather than by “minimum” weight, the final rule uses the term “nominal” and clarifies that the nominal weight must be 4.5 pounds or more.
Second, the definition in subpart A specifies that the multipurpose dry-chemical fire extinguisher be “listed or approved * * * by Underwriters Laboratories, Inc.” The preamble to the final rule for “Subpart C—Fire Prevention and Control,” however, states that—
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