Whitepaper: Short Circuit Current Rating Technical Brief
The Short Circuit Current Rating (SCCR) states the maximum amperage (fault current) a component, enclosure, or unit can withstand during a short circuit event thereby limiting personal injury, damage to the premises, and damage to equipment. A fault occurs when a wiring error or failure inadvertently connects one phase directly to another or a phase to ground. The energized circuit passes current that equals the available power of the distribution panel that feeds it. The excessive amperage is usually in orders of magnitude larger than the full load amps (FLA) of the HVAC unit. The excessive current can damage the equipment, cause a fire or an explosion. The net result of the electrical short can be catastrophic to equipment, the building, and most importantly occupant safety.