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#179966 - 08/07/08 01:23 PM 480 vac Conduit
shop_test Offline
Member

Registered: 08/07/08
Posts: 10
Loc: California
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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#179967 - 08/07/08 02:55 PM Re: 480 vac Conduit [Re: shop_test]
George Little Offline
Member

Registered: 01/18/04
Posts: 1492
Loc: Michigan USA
If I am correct the NEC requires raceways to be "Listed". This may or may not put a crimp in your plans.
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#179970 - 08/07/08 03:13 PM Re: 480 vac Conduit [Re: George Little]
sparkyinak Online   content
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Registered: 07/08/07
Posts: 1286
Loc: Alaska
George is on the money
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#179971 - 08/07/08 03:16 PM Re: 480 vac Conduit [Re: shop_test]
sparkyinak Online   content
Member

Registered: 07/08/07
Posts: 1286
Loc: Alaska
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.


Edited by sparkyinak (08/07/08 03:18 PM)
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#179976 - 08/07/08 04:29 PM Re: 480 vac Conduit [Re: sparkyinak]
EV607797 Offline
Member

Registered: 10/25/06
Posts: 756
Loc: Fredericksburg, VA, USA
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.
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#179999 - 08/08/08 09:42 AM Re: 480 vac Conduit [Re: EV607797]
shop_test Offline
Member

Registered: 08/07/08
Posts: 10
Loc: California
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?

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#180001 - 08/08/08 10:08 AM Re: 480 vac Conduit [Re: shop_test]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9012
Loc: Estero,Fl,usa
I doubt you can weld any raceway. How would you guarantee there was no slag or rough edges inside?
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#180003 - 08/08/08 11:06 AM Re: 480 vac Conduit [Re: gfretwell]
SolarPowered Offline
Member

Registered: 07/05/04
Posts: 615
Loc: Palo Alto, CA, USA
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.


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#180005 - 08/08/08 12:39 PM Re: 480 vac Conduit [Re: SolarPowered]
shop_test Offline
Member

Registered: 08/07/08
Posts: 10
Loc: California
How are the dairies getting away with this. A good number of them only except welded conduits?

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#180006 - 08/08/08 01:25 PM Re: 480 vac Conduit [Re: shop_test]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9012
Loc: Estero,Fl,usa
No inspections?
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