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    Safety Tips | Electrical safety

    Preventing arc flashes

    January 27, 2014

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    Electricity can present many dangers for workers, including arc flash hazards. An arc flash occurs when high-amperage currents travel, or “arc,” through the air. This can happen when high-voltage differences exist across a gap between conductors. The result is an immediate release of tremendous amounts of energy that can reach temperatures as high as 36,000° F, according to the Washington State Department of Labor and Industries.

    Consequences

    Washington L&I states that the heat and light from an arc flash can melt clothing and destroy skin and tissue – and may even result in death. A victim also may fall and collide with objects as a result of being thrown by a pressure wave blast from an arc flash.

    Additionally, Washington L&I points out that some workers may not be able to return to their pre-injury job, leaving employers to bear the costs associated with lost productivity and employee rehiring and retraining.

    Prevention

    To reduce the likelihood of arc flashes, Washington L&I advises employers to adhere to the “Hierarchy of Controls” by implementing the following safety protocols:

    • Elimination/substitution – Schedule jobs when power sources can be de-energized, grounded and tested. Also, determine if a worn piece of electrical equipment can be removed from service or replaced with a newer model.
    • Engineering controls – Implement barriers such as locked electrical vaults and high fences around dangerous locations.
    • Administrative controls – Institute an effective lockout/tagout program that includes all necessary training and equipment.
    • Work practice controls – Ask these questions: Does management set expectations for safe work practices? Do workers meet or exceed safety rules and best work practices? Do supervisors encourage following safety rules and enforce them?
    • Personal protective equipment – Make sure employees are wearing proper protective clothing. For example, they should wear insulated gloves, fire-resistant clothing and a faceshield when working on energized electrical equipment.

    Emergency response

    If a worker suffers an arc flash injury, Washington L&I recommends the following:

    • Rescue should be performed only by people trained in electrical hazards and rescue techniques.
    • Do not touch the victim if he or she is in contact with an energized circuit. Shut off the power and contact emergency services. If you are unable to de-energize the circuit, dislodge the victim from the circuit using a non-conductive material.
    • If the victim is on fire, smother or douse the flames. Remove smoldering clothing, but not clothing melted on the skin.
    • If the victim is not breathing, provide CPR.
    • Run cool – not cold – water over the burn area. Do not apply creams, ointments or ice. After the burn has cooled, cover it with a clean dry cloth.
    • Always seek medical attention after an electrical shock or burn. A victim who feels fine may have internal injuries.