The flash is so fast that it's almost instantaneous. However, the results of an arc flash might cost over $15,000,000 in indirect and direct costs to a business. Therefore, businesses can't afford to ignore the safety problems that surround an arc flash explosion. The Occupational Safety and Health Administration (OSHA) are enforcing new standards for employee safety protection in possible arc flash situations. Basically, an arc flash is caused by a short circuit in the air. When the isolation or the insulation between conductors that are electrified can't withstand the voltage that is applied or is breached, an arc flash will happen. When workers work near or on conductors that are energized, failure of the equipment or contact or movement near the equipment can cause a phase to phase or phase to ground fault. An arc can reach a temperature of over 5000 F and will create a loud noise and a brilliant flash of light. There is a tremendous amount of concentrated radiant energy that will create a pressure wave that can damage the brain or hearing functions, a flash that can damage eyesight, and will explode outward from the electrical equipment, which will cause severe radiation burns or death, melt metal, and spread hot gases. A pressure wave moves extremely fast and can send loose objects like tools and pieces of equipment flying, which can injure anyone standing close. The employees have to be protected while they are working therefore there are regulations that require the calculation of the flash protection boundary. This boundary is an imaginary sphere surrounding the possible arc point. If a person is within this imaginary sphere they might receive second degree burns should an electrical arc flash happen. The amount of energy that is impressed on a surface that is a certain distance from the source (possibly a person) that is generated by an arc flash incident is also defined by this standard. Somewhere in the US, an arch flash explosion happens between five and 10 times a day. That explosion will usually send a burn victim to a special burn center. That number doesn't include the unreported cases or the cases that are sent to regular clinics and hospitals. In addition, there are as many as two deaths each day as a result of these multi trauma events. The costs of these events can be overwhelming. It has been estimated the costs for these electrical was $15,750,000 per case over a period of two years when the indirect costs that were related were included with the direct expenses.
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The flash is so fast that it's almost instantaneous. However, the results of an arc flash might cost over $15,000,000 in indirect and direct costs to a business. Therefore, businesses can't afford to ignore the safety problems that surround an arc flash explosion. The Occupational Safety and Health Administration (OSHA) are enforcing new standards for employee safety protection in possible arc flash situations.
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