MSHA - Code of Federal Regulations - 30 CFR 57.6501
30 CFR § 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
(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.
[56 FR 46509, Sept. 12, 1991; 56 FR 52193, Oct. 18, 1991; 58 FR 31908, June 7, 1993; 58 FR 69596, Dec. 30, 1993]
NOTE: At 58 FR 69596, December 30, 1993, the effective date of §57.6501(a) is
stayed until January 31, 1994.