MSHA - Code of Federal Regulations - 30 CFR 57.6401
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MSHA - Title 30 CFR
30 CFR § 57.6401
Shunting.


Except during testing--

(a) Electric detonators shall be kept shunted until connected to the blasting line or wired into a blasting round;

(b) Wired rounds shall be kept shunted until connected to the blasting line; and

(c) Blasting lines shall be kept shunted until immediately before blasting.


[58 FR 69596, Dec. 30, 1993]