Standards as High as Your Own
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I was told today that a drilled concrete hole can be used as a raceway. They drilled through a concrete stand up wall and put a FS box on the outside and a regular 4” square and just run THHN wire through the drilled concrete hole. I’ve been doing this a long time and can’t believe this can be legal.
Hey David thanks for your question. Single conductors can only be installed as part of a recognized wiring method as stated in 300.3(A). A hole in concrete is not a raceway, as that term is defined in Article 100, or a recognized wiring method.
If you believe it can't be "legal" then why have you been doing it for a long time?
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