7 CCR 1101-9-6-6 - Use of Detonating Cord

(A) Care shall be taken to select a detonating cord consistent with the type and physical condition of the borehole and stemming and the type of explosives used.

(B) Detonating cord shall be handled and used with the same respect and care given other explosives.

(C) If using a detonating type cord for blasting, the double-trunkline or loop systems shall be used.

(D) In multiple-row blasts, the trunkline layout shall be designed so that the detonation can reach each blast hole from at least two directions.

(E) All detonating cord knots shall be tight and all connections shall be kept at right angles to the trunklines.

(F) The line of detonating cord extending out of a borehole or from a charge shall be cut from the supply spool before loading the remainder of the bore hole or placing additional charges.

(G) Detonating cord shall be handled and used with care to avoid damaging or severing the cord during and after loading and hooking-up.

(H) Detonating cord connections shall be made in accordance with the manufacturer's recommended methods. Knot-type or other cord-to-cord connections shall be made only with detonating cord in which the explosive core is dry.

(I) Detonating cord shall be cut with a sharp knife, razor blade or cutters designed for use with detonating cord. Scissors or plier type cutters shall not be used.

(J) All detonating cord trunklines and branch lines shall be free of loops, sharp kinks, or angles that direct the cord back toward the oncoming line of detonation.

(K) All detonating cord connections shall be inspected before firing the blast.

(L) When detonating cord millisecond-delay connectors or short-interval-delay electric detonators are used with detonating cord, the practice shall conform strictly to the manufacturer's recommendations.

(M) When connecting a detonator to detonating cord, the detonator shall be taped or otherwise attached securely along the side or the end of the detonating cord, with the end of the detonator containing the explosive charge pointed in the direction in which the detonation is to proceed.

(N) When initiating detonating cord with fuse detonators and safety fuse, two fuse detonators shall be required.

(O) Detonators for firing the trunkline shall not be brought to the loading area nor attached to the detonating cord until the area has been cleared for the blast.

Notes

7 CCR 1101-9-6-6

38 CR 03, February 10, 2015, effective 3/10/2015 41 CR 21, November 10, 2018, effective 12/1/2018 42 CR 06, March 25, 2019, effective 5/1/2019