MSHA - Code of Federal Regulations - 30 CFR 57.6904
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MSHA - Title 30 CFR
30 CFR § 57.6904
Smoking and open flames.

Smoking and use of open flames shall not be permitted within 50 feet of explosive material except when separated by permanent noncombustible barriers. This standard does not apply to devices designed to ignite safety fuse or to heating devices which do not create a fire or explosion hazard.

[58 FR 69596, Dec. 30, 1993]