National Electrical Installation Standards

Standards as High as Your Own

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Friday, June 15, 2018

Question:

Re: CQD answer published Fri day, June 8, 2018 -

Re cqotd 6/7/18  " ...but there is no exception that fits that usage for not securing the cables to boxes."

314.17(c) exception: where nonmetallic sheathed cable or multi conductor type UF cable is used with single gang boxes no larger than a normal size 57 mm by 100 mm mounted in walls or ceilings and where the cable is fastened with an 8in of the box measured along the sheath and where the sheath extends through a cable knockout no less than a quarter inch, securing the cable to the Box shall not be required.

Positively Electrical

A

Answer:

Hey Positively Electrical thanks for your comment. You are correct that exception exists but typically applies to open walls during the electrical installations. Perhaps the words "that usage" could have been more descriptive in our answer. If cables are fished, as would very likely be the case for the pre-installed structural insulated panels, fastening the cable within 8 inches of a single gang box can't realistically be done. Typically "old work boxes" that include a means to secure the cable to the box are used and the boxes are flush mounted - being supported by the ceiling or wall surfaces.

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