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S-2.1, r. 4 - Safety Code for the construction industry
Section 4.7.4
Disposition versions
4.7.4. Firing may be done from a power line or from a portable generator, provided that:
(a) voltage does not exceed 220 V;
(b) the blasting switch be designed so that:
i. the weighted handle of the blasting switch automatically gravitates to the “off” position and short-circuits the lead wires; and
ii. the door of the box housing the blasting switch is provided with a device that prevents it from being locked or closed unless the blasting switch is in the “off” position. The door must be kept locked except when firing and only the shot-firer shall have the key;
(c) a fused switch is installed between the power source and the blasting switch;
(d) the fused switch and the blasting switch are situated in the proper place for blasting and at a distance of 1.5 to 1.8 m from each other as a precaution against lightning. Underground they will be placed on either side of a tunnel or gallery.
4.7.4. Firing may be done from a power line or from a portable generator, provided that:
(a) voltage does not exceed 220 V;
(b) the blasting switch be designed so that:
i. the weighted handle of the blasting switch automatically gravitates to the “off” position and short-circuits the lead wires; and
ii. the door of the box housing the blasting switch is provided with a device that prevents it from being locked or closed unless the blasting switch is in the “off” position. The door must be kept locked except when firing and only the shot-firer shall have the key;
(c) a fused switch is installed between the power source and the blasting switch;
(d) the fused switch and the blasting switch are situated in the proper place for blasting and at a distance of 1.5 to 1.8 m from each other as a precaution against lightning. Underground they will be placed on either side of a tunnel or gallery.
