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480 vac Conduit #179966 08/07/08 04:23 PM
Joined: Aug 2008
Posts: 10
S
shop_test Offline OP
Member
Currently we use stainless steel welded processing pipe on our skids for low voltage and ss rigid electrical conduit for the 480 going to local pump motors.

Would it meet nec if we run the 480 for the local pump motors in their own welded stainless steel process pipe?

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Re: 480 vac Conduit [Re: shop_test] #179967 08/07/08 05:55 PM
Joined: Jan 2004
Posts: 1,507
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George Little Offline
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If I am correct the NEC requires raceways to be "Listed". This may or may not put a crimp in your plans.


George Little
Re: 480 vac Conduit [Re: George Little] #179970 08/07/08 06:13 PM
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sparkyinak Offline
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George is on the money


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Re: 480 vac Conduit [Re: shop_test] #179971 08/07/08 06:16 PM
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sparkyinak Offline
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Just saw this was your first post. Welcome aboard. I had a thought. What are you actually building? It may have bearing on your post.

Last edited by sparkyinak; 08/07/08 06:18 PM.

"Live Awesome!" - Kevin Carosa
Re: 480 vac Conduit [Re: sparkyinak] #179976 08/07/08 07:29 PM
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EV607797 Offline
Member
Process pipe conforms to many plumbing codes, but not the NEC for use as conduit. My answer would be no, even though it is probably better than any other type of "listed" conduit.


---Ed---

"But the guy at Home Depot said it would work."
Re: 480 vac Conduit [Re: EV607797] #179999 08/08/08 12:42 PM
Joined: Aug 2008
Posts: 10
S
shop_test Offline OP
Member
Thanks for the prompt responces.

These are food and beverage processing skids.

I was afraid that it was the UL that would be the deciding factor. So our only other option would be to weld ss rigid conduit which would look like garbage.

So does that mean that our low voltage in process pipe connecting to ss nema 4x boxes is out of code?

Re: 480 vac Conduit [Re: shop_test] #180001 08/08/08 01:08 PM
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Posts: 9,531
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gfretwell Offline
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I doubt you can weld any raceway. How would you guarantee there was no slag or rough edges inside?


Greg Fretwell
Re: 480 vac Conduit [Re: gfretwell] #180003 08/08/08 02:06 PM
Joined: Jul 2004
Posts: 625
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SolarPowered Offline
Member
Welding conduit is prohibited by NEC section 300.18:

Quote
(B) Welding. Metal raceways shall not be supported, ter-
minated, or connected by welding to the raceway unless
specifically designed to be or otherwise specifically permit-
ted to be in this Code.


Re: 480 vac Conduit [Re: SolarPowered] #180005 08/08/08 03:39 PM
Joined: Aug 2008
Posts: 10
S
shop_test Offline OP
Member
How are the dairies getting away with this. A good number of them only except welded conduits?

Re: 480 vac Conduit [Re: shop_test] #180006 08/08/08 04:25 PM
Joined: Jul 2004
Posts: 9,531
G
gfretwell Offline
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No inspections?


Greg Fretwell
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