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Re: Fire Alarms Conduit size



"dave evans" <daveevans350@xxxxxxxxx> wrote in message
news:4b2a4dad-178f-4098-bfb9-e092d120a6d7@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Many electricians tell me that the minimum EMT conduit size for fire
> alarms is 3/4"
> I can't find any reference in any code book that supports this.
> Can someone point me to a reference or is the 3/4" not required by
> national codes?
>
> TIA
>
> Dave

I've heard that many times too, mostly from electricians that have lost the
bid and complained when they see me running 1/2". I believe it falls into
the same category as the "requirement" that all fire alarm conduit must be
red in colour.

The practice of specifying a minimum 3/4" conduit size probably started
before addressable SLC circuits drastically reduced the number of conductors
in fire alarm raceways.

I have seen numerous job specs that call for a minimum of 3/4" conduit and a
few that specify red conduit but I don't believe you will find either
anywhere in the NEC.


Doug




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