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Re: Threading 2 1/2" Gal pipe. [Re: maintenanceguy] #178253 05/26/08 10:47 PM
Joined: Sep 2002
Posts: 909
N
NORCAL Offline
Member
Locally a metals supplier/fab shop was threading pipe for $10.00 a thread it's been a while so may be more now.

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Re: Threading 2 1/2" Gal pipe. [Re: NORCAL] #178308 05/27/08 08:44 PM
Joined: Apr 2008
Posts: 24
J
judsin Offline
Member
Any big commercial/industrial electrical contractor should be able to thread pipe. I remember at my old job we used to thread pipe for smaller companies/individuals sometimes.

I guess a machine shop should be able to thread pipe but electrical-type threads aren't the same as machine threads are they?

Re: Threading 2 1/2" Gal pipe. [Re: judsin] #178310 05/27/08 08:58 PM
Joined: Jan 2005
Posts: 5,316
renosteinke Offline
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Judsin, a machine shop can make any kind of threads you want. It's their business to cut, drill, and shave metal into unusual - yet precise - shapes.

In our case, the NEC says to use NPT taper threads. That's all you need to tell the shop.

Re: Threading 2 1/2" Gal pipe. [Re: renosteinke] #178321 05/28/08 06:56 AM
Joined: Nov 2000
Posts: 2,148
R
resqcapt19 Offline
Member
reno,
How is the mast not conduit?.


Don(resqcapt19)
Re: Threading 2 1/2" Gal pipe. [Re: resqcapt19] #178323 05/28/08 09:57 AM
Joined: Jan 2005
Posts: 5,316
renosteinke Offline
Cat Servant
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The mast is subject to PoCo rules, not NEC rules .... and PoCo specs, at least in my experience, lack such terms as 'listed.'

Re: Threading 2 1/2" Gal pipe. [Re: renosteinke] #178326 05/28/08 10:43 AM
Joined: Jul 2007
Posts: 1,335
S
sparkyinak Offline
Member
The mast should be installed IAW PoCo standards. The rule of thumb is the PoCo is responsible up to the meter until something goes wrong with it then it is the customers that suddenly becomes responsible.


"Live Awesome!" - Kevin Carosa
Re: Threading 2 1/2" Gal pipe. [Re: sparkyinak] #178327 05/28/08 11:05 AM
Joined: Jun 2007
Posts: 301
J
JValdes Offline
Member
Threading ridged conduit, the threads are the same as a water pipe. NPT is the standard. Take any plumping fitting and you can easily thread it onto a peice of stock ridged pipe.

Re: Threading 2 1/2" Gal pipe. [Re: JValdes] #178329 05/28/08 11:34 AM
Joined: Oct 2006
Posts: 745
E
EV607797 Offline
Member
I thought conduit threads were straight where plumbing threads are tapered. I know that I have tried to use a plumbing nipple before as a conduit nipple and the locknut won't thread all the way down, while at the end, the locknut is very loose-fitting.


---Ed---

"But the guy at Home Depot said it would work."
Re: Threading 2 1/2" Gal pipe. [Re: renosteinke] #178333 05/28/08 01:08 PM
Joined: Nov 2000
Posts: 2,148
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resqcapt19 Offline
Member
Originally Posted by renosteinke
The mast is subject to PoCo rules, not NEC rules .... and PoCo specs, at least in my experience, lack such terms as 'listed.'

The mast is typically on the load side of the service point and is covered by the NEC. In addition to being covered by the NEC, there may be size and support rules from the utility if the service drop is being supported by the mast.


Don(resqcapt19)
Re: Threading 2 1/2" Gal pipe. [Re: resqcapt19] #178334 05/28/08 01:14 PM
Joined: Nov 2000
Posts: 2,148
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resqcapt19 Offline
Member
Ed,
Conduit and plumbing pipe both should have the same threads... 3/4" to the foot taper.
NPT - National Pipe Thread Taper ANSI/ASME B1.20.1

This is the thread that is specified in 344.28 and its FPN.

The real difference is that conduit couplings are straight thread and plumbing couplings are tapered.


Don(resqcapt19)
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