---
kind: "section"
citation: "30 C.F.R. § 23.6"
title: "30"
number: "23.6"
heading: "General requirements for approval."
url: "https://uscodex.org/cfr/30/23.6"
---

# §23.6. General requirements for approval.


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

### 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.