shock (exposed conductors, insulation failure, no earth connection) – short circuits (fires, explosions, arc eye, burns) – overload (fires, burnsejection from machine (leaking seals and jointsescape hazardous material, high pressure steam and air, flammable gases and liquids) ionizing (nondestructive testing (NDT), X-rays, sterilizing, nuclear) – non-ionizing (ultra violet, infrared, lasers, radio frequency, induction heating
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