§23.6. General requirements for approval.
30 C.F.R. § 23.6
Telephones and signaling devices shall be durable in construction, practical in operation, and suitable for conditions of underground service. They shall offer no probable explosion hazard under normal operation if use in gassy or dusty mine atmospheres.
Notes, amendments, and revision history
Authority
Authority: 30 U.S.C. 957, 961. Sec. 23.2(f) also issued under 30 U.S.C. 811.
Source
Source: Schedule 9B, 4 FR 1555, Apr. 11, 1939, unless otherwise noted.