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

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4.7.3. Lead wires must be connected to the blasting machine after the signal indicating that blasting is imminent. Lead wires must always be disconnected from the blasting machine immediately after the firing or after the attempted blast. Both ends of the lead wires must be short-circuited and insulated to guard against stray currents.
R.R.Q., 1981, c. S-2.1, r. 6, s. 4.7.3; O.C. 1959-86, s. 62.