The limited approach is the closest an unqualified person can approach, only allowed further if a qualified person accompanies them. Limited approachĪn approach limit at a distance from an exposed live part where a shock hazard exists. The hazard in this boundary is the heat generated from a flash. This exposures may cause curable second-degree burns (1.2 calories/cm2). If an arc flash occurs, this boundary is where an employee would suffer heat exposure. The flash boundary is the farthest established boundary from the energy source. The risk from exposed live parts depends on your distance from those parts.Įxposed electrical components are hazardous, and if workers make contact with wires, terminals, or other parts, they’ll get shocked. These boundaries, listed from outermost to innermost, include flash protection, limited approach, restricted approach, and prohibited approach. Therefore, boundaries play a massive role in determining the amount of risk that employees face when conducting their work. It’s crucial to understand boundary locations before beginning work on equipment, as these define the employees’ potential exposure to an arc flash and the severity of hazards. The National Fire Protection Association ( NFPA) developed specific approach boundaries designed to protect employees working on or near energized equipment. It’s not uncommon for an injured employee to never regain their previous quality of life and they may also require extended medical care. Three factors determine the severity of an arc flash injury: proximity of the worker to the hazard, temperature, and the time it takes for the circuit to break.īecause of the violent nature of an arc flash exposure, employee injuries can be very serious. Accidental contact with particular parts.There are many things that can cause arc flashes, including:
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