Arc Fault Current

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A high-power electrical discharge between two or more conductors is referred to as an arc fault. This discharge produces heat, which has the potential to degrade the insulation on the wires and start an electrical fire. Arc faults are extremely unpredictable in terms of their severity and duration, and their current can range from a few amps to hundreds of amps.

Identifying the Available Fault Current, or AFC is crucial for selecting various protection systems. It is not only essential for the building’s and the system’s overall safety, but it is also a legal obligation. Except for residential units, all service equipment must be legibly marked with the maximum AFCThe markings must include the date of the calculation of fault current and the sufficient durability of the environment in which it should be performed. . For Arc Flash Hazard Analysis calculations, use the short circuit symmetrical amperes from a bolted 3-phase fault. Select the value at the time of circuit interruption.

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