---
kind: "section"
citation: "30 C.F.R. § 57.22234"
title: "30"
number: "57.22234"
heading: "Actions at 1.0 percent methane (I-A, I-B, III, V-A, and V-B mines)."
url: "https://uscodex.org/cfr/30/57.22234"
---

# §57.22234. Actions at 1.0 percent methane (I-A, I-B, III, V-A, and V-B mines).

- (a) If methane reaches 1.0 percent in the mine atmosphere, ventilation changes shall be made to reduce the methane. Until such changes are achieved—
  - (1) All persons other than competent persons necessary to make the ventilation changes shall be withdrawn from affected areas;
  - (2) Electrical power shall be deenergized in affected areas, except power to monitoring equipment determined by MSHA to be intrinsically safe under [30 CFR part 18](/cfr/30/part18.md); and
  - (3) Diesel equipment shall be shut off or immediately removed from the area.
- (b) If methane reaches 1.0 percent at a main exhaust fan, electrical power underground shall be deenergized, except power to monitoring equipment determined by MSHA to be intrinsically safe under [30 CFR part 18](/cfr/30/part18.md), and all persons shall be withdrawn from the mine.
- (c) If methane reaches 1.0 percent at a work place and there has been a failure of the main ventilation system, all persons shall be withdrawn from the mine.

## Notes

### Amendments

[52 FR 24941, July 1, 1987, as amended at 53 FR 9615, Mar. 24, 1988]

### 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.

### Amendments

[52 FR 24941, July 1, 1987, as amended at 53 FR 9615, Mar. 24, 1988]