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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 compli

Current-limiting overcurrent protective devices can be used in the feeder or branch circuits to increase the assembly SCCR where lower rated components are used. When current-limiting devices (that limit fault current levels to within the lower rated components' ratings) are used, they provide protection for the assembly — provided the ...

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