---
kind: "section"
citation: "30 C.F.R. § 27.37"
title: "30"
number: "27.37"
heading: "Tests to determine adequacy of safety devices for bulbs."
url: "https://uscodex.org/cfr/30/27.37"
---

# §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.


## Notes

### Authority

Authority: 30 U.S.C. 957, 961.

### Source

Source: 31 FR 10607, Aug. 9, 1966, unless otherwise noted.