(1) Electric systems.
(a) Safety switch.
A safety switch must be:
(i) Placed at intervals in the permanent firing line when firing from a power circuit.
(A) So it can only be locked in the "off position" OR
(B) With a short-circuiting arrangement of the firing lines to the detonator circuit
(b) Lighting gap.
A lighting gap must be:
(i) At least five feet ahead (in the firing system) of the main firing switch, between the switch and power source.
(ii) Bridged by a flexible jumper cord just before firing the blast.
[Statutory Authority: RCW 49.17.010, [49.17].040, and[49.17].050 . 02-03-125, § 296-52-67230, filed 1/23/02, effective 3/1/02.]