§57.6501. Nonelectric initiation systems.

Connections with other initiation devices shall be secured in a manner which provides for uninterrupted propagation;

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

Connections between blastholes shall not be made until immediately prior to clearing the blast site when surface delay detonators are used.

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;

In multiple row blasts, the trunkline layout shall be designed so that the detonation can reach each blasthole from at least two directions;

Connections shall be tight and kept at right angles to the trunkline;

Detonators shall be attached securely to the side of the detonating cord and pointed in the direction in which detonation is to proceed;

Connections between blastholes shall not be made until immediately prior to clearing the blast site when surface delay detonators are used; and

Lead-in lines shall be manually unreeled if connected to the trunklines at the blast site.