Simplified Guide To Understanding Short-Circuit Current …

Simplified Guide ToUnderstandingShort- circuit Current RatingFIND IT, FIX IT, FORGET ITWhat Is A Short-Circuit Current Rating(SCCR)?SCCRs on components and equipment represent themaximum level of Short-Circuit Current that the component or equipment can withstand and is used fordetermining compliance with NEC This ratingcan be marked on individual components or assemblies. The new SCCRs represent the maximumamount of fault Current that the assemblycan withstandunder fault conditions. Assembly ratings take intoaccount all components contained within the equipmentrather than just the main overcurrent protective common mistake is to assume that the interruptingrating of the overcurrent protective device protectingthe circuit represents the SCCR for the entire ratings, used for compliance with NEC , apply solely to the overcurrent protective is the characteristics of the overcurrent protectivedevice ( opening time, let-through energy) thatneed to be used in determining compliance with NEC , no

circuit current limit can be hazardous to persons and property. SCCRs marked on components and equipment make it easier to verify proper protection for components and equipment for specific applications — whether it be the initial installation or relocation of equipment. How Is SCCR Determined? For meter disconnect switches and motor controllers,

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