S-2.1, r. 4 - Safety Code for the construction industry

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4.8.4. When it is found that a defect in the electrical circuit has prevented the charges from detonating at time of firing, the shot-firer may immediately check over the circuit after having made sure that:
(a)  the ends of the lead wires are disconnected from the power supply and short-circuited;
(b)  the blasting machine is locked or under a worker’s surveillance; and
(c)  if used, the blasting switch is locked and in open circuit.
R.R.Q., 1981, c. S-2.1, r. 6, s. 4.8.4.