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Reference to rigid steel is made in specs with reference to metal conduit. A commenter wanted to add 316 stainless steel as the material but this verbiage with regards to "rigid steel" still remains.

I have a suspicion that this may with regards to galvanized steel and therefore be a conflict, but could not find any information that would point to exactly what does the language "rigid steel" precisely refer to.

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  • $\begingroup$ LMGTFY $\endgroup$
    – Phil Sweet
    Jun 17, 2021 at 20:42
  • $\begingroup$ I bet the commenter wasn't an electrician. Rigid steel means thick-walled conduit. I would talk to an electrical design house and actual electricians before changing conduit specs to something you potentially won't be able to thread or bend. $\endgroup$
    – Tiger Guy
    Jun 21, 2021 at 13:24

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It is to distinguish it from flexible metal conduit.

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  • $\begingroup$ There's about ten types of nonflex that aren't RMC. $\endgroup$
    – Phil Sweet
    Jun 17, 2021 at 20:58

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