MSHA - Code of Federal Regulations - 30 CFR 28.2
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MSHA - Title 30 CFR
30 CFR § 28.2
Approved fuses.


(a) On and after the effective date of this part, fuses shall be considered to be approved for use with direct current in providing short-circuit protection for trailing cables in coal mines only where such fuses are: (1) The same in all respects as those fuses which have been approved after meeting the minimum requirements for performance and short-circuit protection prescribed in this Part 28; and (2) maintained in an approved condition.