rigid conduit

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NSPL threads are specifically for the use of locknuts, that is what the L stands for.
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That may be the purpose of that thread, but you are not permitted to use a straight thread on electrical conduit. There are installations, other than electrical, that use locknuts and that may be the purpose of NSPL threads.
 
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
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Are compression fittings ok for wet locations or only dry and concrete?
 
infinity said:
IMO the straight thread being weaker isn't much of an issue. If you cut a running thread the entire piece of conduit with the exception of the last inch or so is a straight thread.
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The taper is only within the thickness of the die. The section of the thread that the die has passed completely over is straight. I think the point being made was that if 9 feet 11 inces of a pipe is threaded, then the thread can be considered straight.
 
My impression is that the OP was asking whether rigid conduit comes pre-threaded or do you have to cut the thread yourself. I haven't used alot of it, but I believe standard lengths and pipe nipples are threaded both ends, any thing less than full length would have to have threads cut.
 
elecsup1 said:
My impression is that the OP was asking whether rigid conduit comes pre-threaded or do you have to cut the thread yourself. I haven't used alot of it, but I believe standard lengths and pipe nipples are threaded both ends, any thing less than full length would have to have threads cut.
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One of the strangest things about RMC is that it comes in 10' lengths, measured from the thread on one end to the end of the coupling on the other end. Remove the coupling and it's less than 10' long.
 
infinity said:
One of the strangest things about RMC is that it comes in 10' lengths, measured from the thread on one end to the end of the coupling on the other end. Remove the coupling and it's less than 10' long.
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As Johnnie Carson used to say, "I did not know that!"

That means the installed length is less than 10 feet, so we're technically not getting what we're buying.
 
LarryFine said:
As Johnnie Carson used to say, "I did not know that!"

That means the installed length is less than 10 feet, so we're technically not getting what we're buying.
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It become obvious very quickly when you run some RMC next to some EMT on a rack. The rigid keeps getting shorter!:grin:
 
infinity said:
It become obvious very quickly when you run some RMC next to some EMT on a rack. The rigid keeps getting shorter!:grin:
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Well, of course, it's shorter; it's thicker. ;)

Amd yes, a pound of nails does weigh more than a pound of feathers.
 
iwire said:
Sure your not thinking about an ounce of gold and an ounce of feathers?
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Yes, because I know there really is a difference in that case.

It's no fun making outrageous claims when they're true. :grin:
 
I was taught the reason RMC was tapered was because when you join them in a coupling and make them up "wrench tight " according to the code,the 2 pieces wont butt up to each other inside the coupling and make a lip. This is of course after you thread them to the proper depth or have 2 factory ends.;) ;)
 
travis301 said:
I was taught the reason RMC was tapered was because when you join them in a coupling and make them up "wrench tight " according to the code,the 2 pieces wont butt up to each other inside the coupling and make a lip. This is of course after you thread them to the proper depth or have 2 factory ends.;) ;)
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By why would a straight thread be any different? Two straight threads of the proper length won't butt up together?
 
j rae said:
Are the threads on rigid conduit threaded??? I belive so but some controversy!
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Conduit is not 10 foot lengths till near the end of production.
Flat steel is rolled to form the tube shape and it is welded as it is formed into the round conduit. It is then cut to length.
That would require threading after it is formed.
 
infinity said:
By why would a straight thread be any different? Two straight threads of the proper length won't butt up together?
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I have never seen pipe threading dies that make straight threads unless you continue threading past where you're supposed to stop.

Is there such a thing? Who uses them?

All the dies I have ever seen, if the threads are the proper length, they'll be tapered.
 
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realolman said:
I have never seen pipe threading dies that make straight threads unless you continue threading past where you're supposed to stop.

Is there such a thing? Who uses them?

All the dies I have ever seen, if the threads are the proper length, they'll be tapered.
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ridgid makes dies that can be straight or taperd with a flip of a lever.
 
But what I really want to know is ,..Are the threads on rigid couduit threaded:confused: :grin:
 
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