Code of Federal Regulations Title 30. Mineral Resources § 30.28.2 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.