Rigid Conduit Thread - Taper or straight?


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Anybody can tell me if there is a standard that defines the Type of Thread on Rigid Electrical Conduit?

I thought the standard was Taper-NPT but I have been receiving conduits with some other thread type and now I am confused.
Re: Gil<?> Thu, Jan 31, 2:17 pm, query:

Rigid Metal Conduit (RMC) thread has a taper of 3/4 inch (19mm) per ft.
NFPA 70 (NEC), Section 346, references standardd ANSI/ASME B.1.20.1-1983

Phil Corso, PE
(Boca Raton, FL)
The other answers are correct - but simply put - it is a NPT running thread or straight thread. Pipe fittings require a leak free seal - electrical fittings do not. Straight thread is not limited to 3/4" electrical fittings - we use a
1/8" NPT straight thread on some of our controls.
Thanks Bob Hogg