MSHA - Code of Federal Regulations - 30 CFR 36.31
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MSHA - Title 30 CFR
30 CFR § 36.31
Fire extinguisher.


Each unit of mobile diesel-powered transportation equipment shall be fitted with a fire extinguisher carried in a location easily accessible to the operator and protected by position from external damage. Liquid carbon dioxide extinguishers shall contain an active charge of not less than 4 pounds. Pressurized dry chemical extinguishers shall contain an active charge of not less than 2 1/2 pounds.