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An arc flash also triggers an arc blast , which vaporizes the conductors and sends out an explosion of molten metal , shrapnel , and expanding plasma . Debris from an arc blast can travel at speeds of 700 MPH , which can kill or severely injure anyone in the blast vicinity . Also , the arc blast produces a concussion noise of up to 1.6 decibels , which may result in hearing damage or loss to workers in the facility .
Arc flash accidents are often triggered by a worker touching a test probe to a live electrical surface , or by a dropped tool ( i . e . electricity jumps from an open circuit to the metal blade of a screwdriver ). Other causes include sparks between gaps in insulation , dust or corrosion on a conductor surface , or equipment failure due to improper installation or use of faulty or worn-out equipment .
The OSHA “ general duty ” clause ( Title 29 , Section 5 , Duties ( A ) 1 , ( A ) 2 , and ( B )) states that by law , an employer “ Shall furnish to each of his employees employment and a place of employment which are free from recognized hazards that are causing or are likely to cause death or serious physical harm to his employees .”
Data center owners have a responsibility to provide electricians and other employees with the safest work environment possible . p
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