MSHA - Code of Federal Regulations - 30 CFR 57.6403
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MSHA - Title 30 CFR
30 CFR § 57.6403
Branch circuits.


(a) If electric blasting includes the use of branch circuits, each branch shall be equipped with a safety switch or equivalent method to isolate the circuits to be used.

(b) At least one safety switch or equivalent method of protection shall be located outside the blast area and shall be in the open position until persons are withdrawn.


[58 FR 69596, Dec. 30, 1993]