rigid conduit

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j rae said:
Are the threads on rigid conduit threaded??? I belive so but some conterversy!
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Is this a trick question? :-?


Conduit is threaded with a threader, it does not have the same taper as water pipe though. RMC can also be cut and a compression connector can be put on which converts pipe to threads.


~Matt
 
j rae said:
Are the threads on rigid conduit threaded??? I belive so but some conterversy!
Click to expand...
Factory threads on RMC are machine cut... as opposed to molded, or some other type of fabrication.
 
TOOL_5150 said:
Is this a trick question? :-?


Conduit is threaded with a threader, it does not have the same taper as water pipe though. RMC can also be cut and a compression connector can be put on which converts pipe to threads.


~Matt
Click to expand...

It DOES have the same taper as water pipe.
Electrical threads are tapered. NPT.

344.28 Reaming and Threading
All cut ends shall be reamed or otherwise finished to remove rough edges. Where conduit is threaded in the field, a standard cutting die with a 1 in 16 taper ( 3/ 4-in. taper per foot) shall be used.
FPN: See ANSI/ASME B.1.20.1-1983, Standard for Pipe Threads, General Purpose (Inch).
 
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j rae said:
Are the threads on rigid conduit threaded??? I belive so but some conterversy!
Click to expand...
If you mean with a needle, then no it isn't.:grin:
That should end the controver.:wink: :grin:
 
TOOL_5150 said:
Is this a trick question? :-?


Conduit is threaded with a threader, it does not have the same taper as water pipe though. RMC can also be cut and a compression connector can be put on which converts pipe to threads.


~Matt
Click to expand...
It does have the same taper!
 
j rae said:
Are the threads on rigid conduit threaded??? I belive so but some conterversy!
Click to expand...
Welcome to the Forum, J. Rae.

Are you asking if all ends of rigid metal conduit must be threaded, and that compression or setscrew fittings aren't allowed?

:confused:
 
TOOL_5150 said:
Is this a trick question? :-?


Conduit is threaded with a threader, it does not have the same taper as water pipe though. RMC can also be cut and a compression connector can be put on which converts pipe to threads.


~Matt
Click to expand...
Water pipe and electrical conduit have the same taper, dies sold by Ridgid are only available in one type.
But a water pipe coupling has a taper and an electrical does not.If you mix the two - like I did once- it will leak.
 
tom baker said:
Water pipe and electrical conduit have the same taper, dies sold by Ridgid are only available in one type.
But a water pipe coupling has a taper and an electrical does not.If you mix the two - like I did once- it will leak.
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Actually there are two types of dies both sold by Rigid. NPT- National Pipe Thread which are tapered and NPSM-National Standard Free-Fitting Straight Mechanical Pipe Thread. The latter is sometimes called "the Straight Electrician's Thread" even though the NEC requires the use of field cut tapered threads.
 
infinity said:
Actually there are two types of dies both sold by Rigid. NPT- National Pipe Thread which are tapered and NPSM-National Standard Free-Fitting Straight Mechanical Pipe Thread. The latter is sometimes called "the Straight Electrician's Thread" even though the NEC requires the use of field cut tapered threads.
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I used to work for a company who used the straight threaders, people keep telling me they dont make them or all pipe threads are taperd, I knew I wasnt crazy:grin:
 
ultramegabob said:
I used to work for a company who used the straight threaders, people keep telling me they dont make them or all pipe threads are taperd, I knew I wasnt crazy:grin:
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We used to always used the so called "electricans threads" on our threaders. That what I was taught when I first started in this business. Plumber=tapered threads, electrician= straight threads.

So yes, you're not crazy.;)
 
infinity said:
Actually there are two types of dies both sold by Rigid. NPT- National Pipe Thread which are tapered and NPSM-National Standard Free-Fitting Straight Mechanical Pipe Thread. The latter is sometimes called "the Straight Electrician's Thread" even though the NEC requires the use of field cut tapered threads.
Click to expand...


Thank you infinity. :grin:

~Matt
 
the thing about a tapered thread is the locknuts cant chase all the way down, and it makes it hard to land in a box set another lock nut inside and be able to fit a bushing on what is left....
 
ultramegabob said:
the thing about a tapered thread is the locknuts cant chase all the way down, and it makes it hard to land in a box set another lock nut inside and be able to fit a bushing on what is left....
Click to expand...

I've done a lot of rigid pipe (almost exclusively for 5 years of my career) and never had an issue with locknuts and/or bushings fitting properly on NPT tapered threads.
 
j rae said:
Are the threads on rigid conduit threaded??? I belive so but some conterversy!
Click to expand...

You know what I love about this site?,... there is no way to know what this guy is asking or if there is even a question ,..and yet there are 20 responses ... we have answers looking for questions :smile:
 
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