---
kind: "section"
citation: "30 C.F.R. § 75.1314"
title: "30"
number: "75.1314"
heading: "Sheathed explosive units."
url: "https://uscodex.org/cfr/30/75.1314"
---

# §75.1314. Sheathed explosive units.

- (a) A separate instantaneous detonator shall be used to fire each sheathed explosive unit.
- (b) Sheathed explosive units shall be primed and placed in position for firing only by a qualified person or a person working in the presence of and under the direction of a qualified person. To prime a sheathed explosive unit, the entire detonator shall be inserted into the detonator well of the unit and be held securely in place.
- (c) Sheathed explosive units shall not be primed until immediately before the units are placed where they are to be fired. A sheathed explosive unit shall not be primed if it is damaged or deteriorated.
- (d) Except in anthracite mines, rock dust shall be applied to the roof, ribs and floor within a 40-foot radius of the location where the sheathed explosive units are to be fired.
- (e) No more than three sheathed explosive units shall be fired at one time.
- (f) No sheathed explosive unit shall be fired in contact with another sheathed explosive unit.

## Notes

### Source

Source: 53 FR 46786, Nov. 18, 1988, unless otherwise noted.

### Authority

Authority: 30 U.S.C. 811, 813(h), 957.

### Source

Source: 35 FR 17890, Nov. 20, 1970, unless otherwise noted.