“extraneous electricity” means unwanted electrical energy greater than 50 mA that is present at a blasting area and that may enter an electric blasting circuit, and includes stray electrical current, static electricity, radio frequency energy and time-varying electric and magnetic fields.
167(2)Where an electric initiation of blasting is used, a blaster shall ensure that electric blasting circuits are kept on the ground, except that bare connections may be elevated to prevent current leakage.
167(3)A blaster shall ensure that electric initiation of blasting is not used
(a)
where there is a danger from extraneous electricity, or
(b)
when blasting within 100 m of electric power lines.