Program Policy Manual - VOLUME V - Mine Safety and Health ...

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MSHA PROGRAM POLICY MANUAL VOLUME V protection than a plant served by a local fire department. 77.1108-1 Type and Capacity of Firefighting Equipment The size and location of fire extinguishers required in paragraph (b) should follow recommendations given in the appropriate National Fire Protection Association Codes. The type of extinguishing agent shall conform with the size and class of potential fire hazard. Carbon tetrachloride fire extinguishers are not acceptable in accordance with the National Fire Protection Code. Carbon tetrachloride is toxic and is harmful if not handled properly. 77.1109 Quantity and Location of Firefighting Equipment When questions arise concerning paragraph (a), the standards presented in National Fire Protection Code No. 10 shall be used as a guide. Generally, a minimum of one extinguisher having a rating no less than 2A8B or 2A8BC where electrical installations are present shall be provided on each floor or level in the structure. At least one extinguisher shall be provided for each 3,000 square feet of floor space. Where the floor space exceeds 3,000 square feet, and more than one extinguisher is required, they shall be no more than 75 feet apart. If the area protected contains permanent electrical installations, the maximum distance between extinguishers shall be no more than 50 feet. The purpose of paragraph (b) is to insure that a water stream or dry powder extinguishing agent can be applied at any location in the building. The 125-pound extinguisher can be a single unit or made up of several smaller units, provided the total weight of powder meets the requirement. A 125-pound dry chemical extinguishing unit shall be provided for each 5,000 square feet of floor area in a building of noncombustible construction, or 2,500 square feet area in a building of combustible construction. A single 125-pound unit can provide protection for more than a single floor if the system is permanently installed with rigid piping. Thus, a portable 125-pound unit can serve only a single floor, but a permanently installed unit may serve one or more floors, provided the floor area does not exceed 2,500 or 5,000 square feet, depending on the type of construction. The following portable fire extinguisher ratings will be acceptable as meeting the requirements of paragraph (c)(1). All trucks up to and including those of 20-ton (load) capacity February 2003 (Release V-33) 199
MSHA PROGRAM POLICY MANUAL VOLUME V should be equipped with at least one extinguisher having a minimum rating of 5BC. Trucks larger than 20-ton capacity should be equipped with an extinguisher having at least a 10BC rating. Two 5BC extinguishers are acceptable. Other mobile equipment, such as front-end loaders, bulldozers, portable welding units, and augers of comparable size (to the trucks) should be rated on an equivalent basis, except hydraulically-operated equipment containing flammable and combustible liquids, trucks transporting flammable and combustible liquids, and diesel-powered motor generator sets. Examples are as follows: 1. A front-end loader or portable welding unit no larger in size (weight) than a 20-ton truck should require the same protection as a 20-ton truck or 5BC. 2. A front-end loader, bulldozer, auger, etc., larger than a 20-ton truck should require the same protection as a truck larger than a 20-ton or 10BC. Mobile equipment containing flammable and combustible liquids, including trucks transporting flammable and combustible liquids and diesel-powered motor generator sets, should be protected with extinguishers having a minimum rating twice that required for other mobile equipment in examples 1 and 2; except that additional fire protection shall not be required for equipment using hydraulic fluids only for power-steering and powerbreaking systems. Paragraph (c)(2) requires equipment larger in size than that equivalent to a 50-ton truck to be provided with additional fire protection commensurate with the hazard. A minimum of one extinguisher having the proper rating shall be provided on each of all multilevel equipment such as shovels and draglines. The extinguisher required by paragraph (c)(3) should be rated no less than 5BC. When implementing paragraph (d), judgment shall be used in the evaluation of the requirements for extinguishers at each permanent electrical installation. One portable extinguisher can serve several adjacent electric motors or transformers. Extinguishers provided and located according to paragraph (a) shall be acceptable as protection for electrical installations within that area, provided such extinguishers are no more than 50 feet from the electrical installation. February 2003 (Release V-33) 200
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Program Policy Manual - VOLUME V - Mine Safety and Health ...

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