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running threads #47396 01/14/05 11:05 PM
Joined: Feb 2001
Posts: 159
CRW Offline OP
If the NPT thread taper for conduit is 3/4" per foot, what would happen if you ran out threads for 2 feet on a piece of 3/4" inch conduit?

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Re: running threads #47397 01/15/05 01:01 AM
Joined: Nov 2000
Posts: 2,148
resqcapt19 Offline
You have a long section of straight threads. Only the end of the threaded section will have any taper.

Re: running threads #47398 01/15/05 01:04 AM
Joined: Apr 2003
Posts: 5
CANMAN Offline
Junior Member
If you were to do this you would have 23 and 3/4 inches with no taper and the last 3/4 inch of thread would have 3/4 inch per foot taper.It would be very weak and easy to break and if used a violation of 344.42(b).

Re: running threads #47399 01/15/05 06:48 AM
Joined: Jan 2003
Posts: 4,391
iwire Offline
Welcome to ECN CANMAN. [Linked Image]

if used a violation of 344.42(b).

That is true only if used with a coupling, you could make an 'all thread' nipple to be used with locknuts.


Bob Badger
Construction & Maintenance Electrician
Re: running threads #47400 01/15/05 07:22 AM
Joined: Apr 2003
Posts: 5
CANMAN Offline
Junior Member
Thanks Bob,I agree that you could make an all thread but I do not believe that the all thread would meet the requirements of 344.28.In other words it would not have the required taper,I have seen it done before though so you have a very good point.


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