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Code Question of the Day

The Code Question of the Day (CQD) is NECA and ELECTRICAL CONTRACTOR Magazine’s flagship National Electrical Code (NEC®) public forum for the industry. The daily distribution of Q&A generates a lively dialogue and shares relative Code-based practical responses.

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August 21, 2026

Question:

Hello CQD. Can Type SE cable be used as an interior feeder in a residential application, or is it limited to service entrance use only? The name suggests service entrance only but I have seen it used inside. Thanks, Vince P.

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August 20, 2026

Question:

Good morning CQD. Is a back-fed main breaker in a residential panel required to be physically secured to the bus in any specific way, or is it just plugged in like any other breaker? Thanks, Brad L.

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Answer:

Good Morning Brad. Section 408.36(D) requires a back-fed device used as the service disconnecting means to be secured in place by an additional fastener that requires other than a pulling motion to release. This is typically a listed screw or clip provided by the manufacturer to prevent accidental removal.