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Old 08-20-2011, 09:59 PM   #1
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"Rigid" electrical conduit


Hi,
New guy to the board here. I am in a quandary.

Can G.I. pipe fittings be used in "rigid" conduit applications in Chicago? I am re-directing a service to a main box and I cannot find "rigid" style conduit nipples in the sizes I need but I can get them in galvanized iron.
I am speaking specifically about 1 1/4" nipples. I have access to a Rigid
pipe threading machine, but it doesn't have a nipple chuck. I suppose I could rig up one and make my own nipples but that means buying a 10' length of pipe for less than 2 ft combined total inches of nipples.

Can someone help me with this quandary?

TIA

Karl Andrews

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Old 08-21-2011, 08:31 AM   #2
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"Rigid" electrical conduit


No, galvanixed pipe can not be used.
Most hardware store will cut and thread the nipples for you.

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Old 08-21-2011, 08:36 AM   #3
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"Rigid" electrical conduit


Is the 'no' a Chicago rule or another rule?
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Old 08-21-2011, 08:40 AM   #4
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"Rigid" electrical conduit


There must be an electrical supply house around --

Where are you located?
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Old 08-21-2011, 08:43 AM   #5
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"Rigid" electrical conduit


Plumbing pipe is not the same as rigid conduit. The inside can have rough edges that will nick the wire. Go to a supply house, they will have what you need.
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Old 08-21-2011, 08:45 AM   #6
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"Rigid" electrical conduit


Quote:
Originally Posted by Code05
Plumbing pipe is not the same as rigid conduit. The inside can have rough edges that will nick the wire. Go to a supply house, they will have what you need.
It might not be best practice, but is it forbidden?
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Old 08-21-2011, 08:51 AM   #7
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"Rigid" electrical conduit


The NEC requires things to be used for their purpose. Plumbing pipe is not listed for electrical usage.
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Old 08-21-2011, 08:52 AM   #8
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"Rigid" electrical conduit


I believe the threads on rigid conduit are straight and plumbing pipe has tapered---so yes it is prohibited.
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Old 08-21-2011, 09:02 AM   #9
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"Rigid" electrical conduit


Quote:
Originally Posted by oh'mike View Post
I believe the threads on rigid conduit are straight and plumbing pipe has tapered---so yes it is prohibited.

Rigid is tapered.

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.
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Old 08-21-2011, 09:22 AM   #10
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"Rigid" electrical conduit


Good to know----I'm not an electrician although I worked for one some years back-----
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Old 08-21-2011, 10:07 AM   #11
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"Rigid" electrical conduit


Quote:
Originally Posted by oh'mike View Post
I believe the threads on rigid conduit are straight and plumbing pipe has tapered---so yes it is prohibited.
================================================== ====

The pipe fittings I have fit perfectly, so I'm not worried about the threads.

I'll check around, we don't have a lot of electical supply houses in my 'hood, and the "big box" stores dont carry a lot of larger size fittings although I know where a couple are.
Thanks for the help.

KA
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Old 08-21-2011, 10:11 AM   #12
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"Rigid" electrical conduit


Quote:
Originally Posted by jbfan View Post
No, galvanixed pipe can not be used.
Most hardware store will cut and thread the nipples for you.
================================================== ===

The hardware store I work p/t at doesn't carry 1 1/4 fittings, nor do we carry that size "rigid". Most hardware stores don't carry larger sizes. We dont even carry 1 1/4 in the catalog. I'll try to find the size nipples I need and if push comes to shove I can buy a piece of rigid , cut and thread it myself. I can jerry-rig a threading jig for the shorter pieces.

KA
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Old 08-21-2011, 11:42 AM   #13
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"Rigid" electrical conduit


One of these places should have it

http://maps.google.com/maps?q=electr...+chicago%2C+il
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Old 08-21-2011, 01:19 PM   #14
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"Rigid" electrical conduit


Quote:
Originally Posted by Jim Port
The NEC requires things to be used for their purpose. Plumbing pipe is not listed for electrical usage.
What is plumbing pipe, by definition?
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Old 08-21-2011, 02:31 PM   #15
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"Rigid" electrical conduit


Quote:
Originally Posted by jlmran View Post
What is plumbing pipe, by definition?

It ain't Rigid Metal Conduit and it ain't listed as such.

344.6 Listing Requirements. RMC, factory elbows and
couplings, and associated fittings shall be listed.

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