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.
Title 30 published on 2013-07-01
no entries appear in the Federal Register after this date.