Design

Your most pressing National Electrical Code (NEC) questions answered

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Any time the OCPD is rated over 800A, the ampacity of the conductors it’s protecting must be at least the rating of the OCPD [240.4(C)].

Protect people and equipment below when running raceway overhead.

Don’t use the NEC requirements for secondary conductors and tap rules.

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If you’re working with 800A or less, don’t worry if an OCPD rated at 700A won’t accommodate your loads, but one rated at 800A exceeds the ampacity of your conductors [240.4(B)].

Check your next work location to avoid conflicts with these specific NEC rules.