30 C.F.R. § 27.37 Tests to determine adequacy of safety devices for bulbs.
Title 30 - Mineral Resources
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.
Title 30: Mineral Resources
PART 27—METHANE-MONITORING SYSTEMS
Subpart C—Test Requirements
§ 27.37 Tests to determine adequacy of safety devices for bulbs.
