---
kind: "section"
citation: "30 C.F.R. § 57.6501"
title: "30"
number: "57.6501"
heading: "Nonelectric initiation systems."
url: "https://uscodex.org/cfr/30/57.6501"
---

# §57.6501. Nonelectric initiation systems.

- (a) **When the nonelectric initiation system uses shock tube—**
  - (1) Connections with other initiation devices shall be secured in a manner which provides for uninterrupted propagation;
  - (2) Factory-made units shall be used as assembled and shall not be cut except that a single splice is permitted on the lead-in trunkline during dry conditions; and
  - (3) Connections between blastholes shall not be made until immediately prior to clearing the blast site when surface delay detonators are used.
- (b) **When the nonelectric initiation system uses detonating cord—**
  - (1) The line of detonating cord extending out of a blasthole shall be cut from the supply spool immediately after the attached explosive is correctly positioned in the hole;
  - (2) In multiple row blasts, the trunkline layout shall be designed so that the detonation can reach each blasthole from at least two directions;
  - (3) Connections shall be tight and kept at right angles to the trunkline;
  - (4) Detonators shall be attached securely to the side of the detonating cord and pointed in the direction in which detonation is to proceed;
  - (5) Connections between blastholes shall not be made until immediately prior to clearing the blast site when surface delay detonators are used; and
  - (6) Lead-in lines shall be manually unreeled if connected to the trunklines at the blast site.
- (c) When nonelectric initiation systems use gas tube, continuity of the circuit shall be tested prior to blasting.

## Notes

### Source

Source: 61 FR 36801, July 12, 1996, unless otherwise noted.

### Authority

Authority: 30 U.S.C. 811.

### Source

Source: 50 FR 4082, Jan. 29, 1985, unless otherwise noted.