---
kind: "section"
citation: "42 C.F.R. § 84.301"
title: "42"
number: "84.301"
heading: "Applicability to new and previously approved CCERs."
url: "https://uscodex.org/cfr/42/84.301"
---

# §84.301. Applicability to new and previously approved CCERs.

- (a) Any CCER approval issued after April 9, 2012 must comply with the technical requirements of subpart O.
- (b) The continued manufacturing, labeling, and sale of closed-circuit apparatus previously approved under [subpart H](/cfr/42/subpartH.md) is authorized for units required for use in underground coal mines pursuant to [30 CFR 75.1714-1](/cfr/30/75.1714-1.md).
- (c) Any manufacturer-requested modification to a device approved under the subpart H technical requirements must comply with the subpart H technical requirements and address an identified worker safety or health concern to be granted an extension of the NIOSH approval. Major modifications to the configuration that will result in a new approval must meet and be issued approvals under the requirements of this subpart O.

## Notes

### Amendments

[84 FR 16412, Apr. 19, 2019]

### Source

Source: 77 FR 14193, Mar. 8, 2012, unless otherwise noted.

### Authority

Authority: 29 U.S.C. 651 et seq.; 30 U.S.C. 3, 5, 7, 811, 842(h), 844.

### Source

Source: 60 FR 30355, June 8, 1995, unless otherwise noted.

### Amendments

[84 FR 16412, Apr. 19, 2019]