Short Circuit Current Rating for Industrial Control Panels
Guidelines on the Short Circuit Current Rating
Since the 2005 edition, the NFPA70: National Electrical Code® (NEC) requires that industrial control panels have to
be marked with an appropriate short circuit current rating (SCCR). This became effective and mandatory in April 2006. The SCCR value in kA, at a defined voltage, is an indication of what fault current the industrial control panel can withstand(without unacceptable damage) in the event of a fault. Thus, the maximum fault current and the panel’s short circuit current rating should not be confused. Furthermore, an industrial control panel shall not be installed where the available fault current exceeds its short circuit current rating.
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