Mine Safety and Health Administration (MSHA) - Code of Federal Regulations - 30 CFR 18.52
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MSHA - Title 30 CFR
30 CFR § 18.52

Renewal of fuses.

Enclosure covers that provide access to fuses, other than headlight, control-circuit, and handheld-tool fuses, shall be interlocked with a circuit-interrupting device. Fuses shall be inserted on the load side of the circuit interrupter.

Subpart C--Inspections and Tests

See MSHA's Program Policy Manual