30 CFR § 57.6401
Shunting
July 29, 2020
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.
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