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(b) In electrical blasting, the ends of leading wires shall be kept shorted until ready to blast. Circuits should be tested at least every 10 feet if stemming is placed in the cross-cuts, or before each explosives charge is placed.
(c) When detonating cord is used, a double line of cord with frequent cross ties shall be used throughout so that the detonating wave can reach each explosive charge from 2 independent sources.
(d) Coyote holes shall be backfilled tightly and for a sufficient length to prevent a blown-out shot.
(e) The area being loaded for blasting shall be plainly marked both in front and on top of the bank to be blasted with appropriate warning signs.
Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.
1. New Note filed 7-11-2003; operative 8-10-2003 (Register 2003, No. 28).