Incident Prevention Magazine

Samy Faried

Arc Flash Mitigating Technologies and the OSHA Final Rule

Arc Flash Mitigating Technologies and the OSHA Final Rule

On April 11, 2014, OSHA issued the final rule regarding 29 CFR 1910.269 and 1926 Subpart V. The final rule included modifications that address minimum approach distances, fall protection systems and hazards of electric arcs. Since the publication of the rule, there have been an extensive number of articles published that detail changes to 1910.269 and 1926 Subpart V. Those articles focus on explaining the changes but most lack information about arc flash mitigating technologies.

This article focuses on current technologies available to minimize and prevent exposure of workers to arc flashes. Employers must ensure workers are provided the necessary protection against these flashes, as it can mean the difference between life and death. According to NFPA 70E, arc flash incidents occur five to 10 times each day and account for 400 fatalities each year. Additionally, the Electrical Safety Foundation International has reported that more than 2,000 workers are treated annually for flash-related burns. The severity of a flash and the related severity of injury primarily depend on the magnitude of the arcing current and the duration of exposure. A typical three-cycle circuit breaker will interrupt fault currents in 50 milliseconds. Exposure to a temperature of 205 degrees Fahrenheit for 100 milliseconds may cause a third-degree burn, which will cause skin to fall off and may result in death.

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