OHS Code Explanation Guide

Published Date: July 01, 2009
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Part 36 Mining

Section 651 Electric blasting

Subsection 651(1)

Electromagnetic radiation may introduce sufficient electrical current in an electrical blasting system to prematurely initiate detonation devices.

Subsection 651(2)

The build-up of electrical charges can produce sufficient electrical current to cause premature detonation and explosion.

Vibration from the blast or the shock wave produced by the blast can cause arcing and damage to electrical distribution systems.

Subsection 651(3)

Radio transmitters may induce electric current flow in susceptible electric detonators, causing explosion. Tables 1 and 2 of Schedule 11 specify minimum separation distances to be maintained to prevent such induction.

Subsection 651(4)

The same rationale applies as in subsection 651(3). The induction source in this instance is electrical trailing cable. As a current flows through a wire or cable, it creates electric and magnetic fields around it. Lead wires laid out parallel to trailing cables may have a current induced in them by the magnetic field produced by current flowing through the trailing cables.