---
kind: "section"
citation: "30 C.F.R. § 57.22307"
title: "30"
number: "57.22307"
heading: "Methane monitors (II-A mines)."
url: "https://uscodex.org/cfr/30/57.22307"
---

# §57.22307. Methane monitors (II-A mines).

- (a) Methane monitors shall be installed on continuous mining machines, longwall mining systems, bench and face drills, and undercutting machines used in or beyond the last open crosscut.
- (b) **The monitors shall—**
  - (1) Give warning at 0.5 percent methane;
  - (2) Automatically deenergize electrical equipment, except power to monitoring equipment determined by MSHA to be intrinsically safe under [30 CFR part 18](/cfr/30/part18.md), and prevent starting such equipment when methane levels reach 1.0 percent; and
  - (3) **Automatically deenergize the equipment when power to a sensor is interrupted.**
- (c) Sensing units of monitors shall be positioned at a location which provides for the most effective measurement of methane.

## Notes

### Authority

Authority: 30 U.S.C. 811.

### Source

Source: 52 FR 24941, July 1, 1987, unless otherwise noted.

### Authority

Authority: 30 U.S.C. 811.

### Source

Source: 50 FR 4082, Jan. 29, 1985, unless otherwise noted.