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Inspector says that I have to use red emt conduit for fire alarm system. I want to prove that it doesn't specified in any standarts.

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The only marking I am aware of is the branch circuit circuit breaker is required to be identified with RED, and the location of the OCPD is to be permanently identified at the fire alarm control panel NEC 2014 760.41 & 760.121. NFPA 72 is referenced in the commentary for 760.41 with the same information and no colored conduit requirement.

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