§ 27.37. Tests to determine adequacy of safety devices for bulbs.
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/us/cfr/t30/s§ 27.37·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
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.