Sources of outside electricity:
(1) lightning
(2) static electricity
(3) electrical power lines
(4) electro-magnetic radiation from a radio frequency transmitter or mobile device
(5) break in insulation around wires
(6) ungrounded equipment
(7) defective electrical detonator
(8) failure to connect wires correctly
Risk mitigation:
(1) Proper grounding of all equipment.
(2) Keeping mobile communication devices away from a blast site.
(3) Making sure that there are no radio frequency or other electromagnetic transmitters nearby.
(4) Making sure that all wires are placed carefully and that the insulation is intact.
(5) Watching for underground electric power wires near the blast site.
(6) Minimizing static electricity when dispensing explosives, especially in dry weather.
(7) Proper precautions during thunderstorms.
(8) Use of high quality equipment.
(9) Proper training of all personnel.
