---
kind: "section"
citation: "30 C.F.R. § 57.22232"
title: "30"
number: "57.22232"
heading: "Actions at 0.5 percent methane (I-B, II-A, II-B, IV, V-B, and VI mines)."
url: "https://uscodex.org/cfr/30/57.22232"
---

# §57.22232. Actions at 0.5 percent methane (I-B, II-A, II-B, IV, V-B, and VI mines).


If methane reaches 0.5 percent in the mine atmosphere, ventilation changes shall be made to reduce the level of methane. Until methane is reduced to less than 0.5 percent, 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). Diesel equipment shall be shut off or immediately removed from the area and no other work shall be permitted in affected areas.


## Notes

### Amendments

[52 FR 24941, July 1, 1987; 52 FR 27903, July 24, 1987]

### 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; 52 FR 27903, July 24, 1987]