MSHA - Code of Federal Regulations - 30 CFR 27.37
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MSHA - Title 30 CFR
30 CFR § 27.37
Tests to determine adequacy of safety devices for bulbs.

The glass envelope of bulbs with the filament incandescent at normal operating voltage shall be broken in flammable methane-air or natural gas-air mixtures in a gallery to determine that the safety device will prevent ignition of the flammable mixtures.