OHS Code

Published Date: July 01, 2009
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Part 36 Mining

Section 642 Circuit requirement

(1) A mine blaster must ensure that

(a) power circuits used for blasting meet the requirements of clause 3.7 of CSA Standard CAN/CSA-M421-00 (R2007), Use of Electricity in Mines,

(b) the blasting machine or power source has adequate capacity for the number of detonators involved, and

(c) circuits supplying electricity for blasting are fed from

(i) a blasting machine,

(ii) an isolating transformer, or

(iii) a power source that does not supply any other equipment.

(2) A mine blaster must ensure that lead wires between the blasting machine and the zone of blasting operations

(a) are not less than No. 16 AWG in size,

(b) are readily identifiable as being for blasting use,

(c) are waterproof,

(d) consist of 2 insulated conductors,

(e) are used only for blasting,

(f) are kept at a distance of not less than 1.5 metres from a power or lighting cable, and

(g) are installed so that they do not touch pipes, rails or other electrically conductive materials.

(3) A mine blaster must ensure that expendable connecting wires used from the lead wires to the leg wires of the electric detonator are not less than No. 20 AWG in size.