Lesson Category: ARC Flash

Prevention

Tasks with Potential Arc Flash Operating a switch or circuit breaker Inserting or removing a circuit breaker Opening an enclosure door Removing a cover (bolted or hinged) Testing for voltage In each task a worker is interacting with energized equipment. Arc Flash Hazard Analysis If work must be done on or near energized electrical equipment, …

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Protective Clothing and Equipment

Flame Resistant (FR) Clothing Protects a worker from receiving severe burns if the worker is exposed to a flame. Is self-extinguishing when the source of the flame is removed. FR Rated Clothing Limit the ‘Incident Energy’ level of the arc flash to 1.2 cal/cm2 against the worker’s chest. Look for a label that states: 1506 …

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ARC Flash Injuries

Arc Flash Injuries include: Severity Factors: Power – Amount of energy at the arc. Distance – Of the worker to the arc. People have been seriously injured from an arc flash even at 10 feet or more from the arc center. Time – Duration of the arc exposure.   How often does Arc Flash Happen? …

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Introduction to ARC Flash

What is an Arc Flash? An arc occurs when electric current flows between two or more separated energize conducting surfaces. The heat energy and intense light at the point of the arc is an arc flash. What is an Electric Arc? An electric arc is a short circuit through the air. Characteristics of an Electric …

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