---
kind: "section"
citation: "30 C.F.R. § 28.21"
title: "30"
number: "28.21"
heading: "Certificates of approval; contents."
url: "https://uscodex.org/cfr/30/28.21"
---

# §28.21. Certificates of approval; contents.

- (a) Each certificate of approval shall contain a description of the fuse and a classification of its current-interrupting capacity and current rating.
- (b) The certificate of approval shall specifically set forth any restrictions or limitations on the use of the fuse in providing short-circuit protection for trailing cables.
- (c) Each certificate of approval shall be accompanied by a reproduction of the approval label or marking design, as appropriate, to be employed by the applicant with each approved fuse as provided in [§ 28.23](/cfr/30/28.23.md).
- (d) No test data or specific laboratory findings will accompany any certificate of approval; however, MSHA will release analyses of pertinent test data and specific findings upon receipt of a written request by the applicant, or when required by statute or regulation.
- (e) Each certificate of approval shall also contain the approved quality control plan as specified in [§ 28.31](/cfr/30/28.31.md).

## Notes

### Authority

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

### Source

Source: 37 FR 7562, Apr. 15, 1972, unless otherwise noted.