3/28/2024 0 Comments Obstruction in arc flash boundary![]() ![]() There is a higher risk of an arc flash incident when workers are:Įxposed to energized parts repeatedly or for extended periods ![]() The risk of an arc flash and your exposure to it depends on many factors. Sparks produced during racking of breakers, replacement of fuses, and closing into faulted lines andīirds or rodents that snap leads at connections. Here are some additional causes of arc flash:īuildup of dust, impurities, and corrosion on insulating surfaces, which can provide a path for current Inattentiveness to the risks posed by energized equipment. Testing electrical equipment with inappropriate instruments and Insulation failure where the fault current’s magnetic effect causes conductors to separate, producing an arc Improper work procedures, such as working on energized equipment when it should have been de-energized or locked out Tools dropped on conductors, circuit breakers, or other energized parts, which can cause a short-circuit Īccidental contact with electrical systems, such as a worker accidentally touching an energized conductor thought to be de-energized You can be severely injured from an arc flash without touching the energized equipment! Workers have been injured while they were several feet away from the arc flash. The arc blast pressure wave can damage your hearing.Įquipment that is part of or exposed to the arc blast is often severely damaged.Īlso, flying debris can puncture or lacerate the skin. Severe burns can also occur from contacting surfaces or being hit by super-heated projectiles or when clothing or equipment catches fire from the thermal blast. The heat blast can cause severe burns several feet from the source. The flash itself can reach 35,000 degrees Fahrenheit, and the resultant fireball will severely burn skin and underlying tissue. The thermal blast generates a superheated ball of gas that can severely burn the human body and even melt metal.Įlectrical burns, often severe, are a common injury from arc flash incidents. The blast can send loose material like pieces of damaged equipment, tools, molten metal, and other objects flying through the air. ![]() The wave can cover several feet in half a second. In an arc flash incident, an enormous amount of concentrated radiant energy emanates outward from the source of the arc, along with extremely hot gases (arc plasma).Ī high-intensity flash is produced that can be bright enough to damage your eyesight.Īn instantaneous and powerful pressure wave that radiates from the source of the arc flash is also produced. However, high-voltage incidents can be the most catastrophic. Low voltage equipment sources (under 600 volts) account for most electrical arc flash occurrences. Most electrical arc flash injuries do not occur in the presence of high-voltage (above 600 volts) electrical currents. It occurs when an electric current flows between separate energized conducting surfaces, such as when circuit breakers and disconnects are opened and closed, when energized equipment is touched with a tool, or when equipment fails. Respond appropriately to an arc flash incident.Īn arc flash is a high-amperage short circuit that sends an electric current through the air. Identify and wear the proper personal protective equipment, or “PPE” and Implement procedures to prevent arc flash Identify the causes and risks of arc flash We’ll also discuss the procedures for preventing an arc flash accident, and how to protect yourself from the hazards of an arc flash.īy the end of the training session, you will be able to: In this session we’ll talk about the hazards and risks of working on or near energized electrical equipment. Welcome to this training session about arc flash. ![]()
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