---
kind: "section"
citation: "30 C.F.R. § 18.46"
title: "30"
number: "18.46"
heading: "Headlights."
url: "https://uscodex.org/cfr/30/18.46"
---

# §18.46. Headlights.

- (a) Headlights shall be constructed as explosion-proof enclosures.
- (b) Headlights shall be mounted to provide illumination where it will be most effective. They shall be protected from damage by guarding or location.
- (c) Lenses for headlights shall be glass or other suitable material with physical characteristics equivalent to 1/2-inch thick tempered glass, such as “Pyrex.” Lenses shall meet the requirements of the tests prescribed in [§ 18.66](/cfr/30/18.66.md).
- (d) Lenses permanently fixed in a ring with lead, epoxy, or equivalent will be acceptable provided only lens assemblies meeting the original manufacturer's specifications are used as replacements.
- (e) If a single lead gasket is used, the contact surface of the opposite side of the lens shall be plane within a maximum deviation of 0.002 inch.

## Notes

### Authority

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

### Source

Source: 33 FR 4660, Mar. 19, 1968, unless otherwise noted.