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#179966 - 08/07/08 03:23 PM 480 vac Conduit  
shop_test  Offline
Member
Joined: Aug 2008
Posts: 10
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 04:55 PM Re: 480 vac Conduit [Re: shop_test]  
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
If I am correct the NEC requires raceways to be "Listed". This may or may not put a crimp in your plans.


George Little

#179970 - 08/07/08 05:13 PM Re: 480 vac Conduit [Re: George Little]  
sparkyinak  Offline
Member
Joined: Jul 2007
Posts: 1,328
Alaska
George is on the money


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#179971 - 08/07/08 05:16 PM Re: 480 vac Conduit [Re: shop_test]  
sparkyinak  Offline
Member
Joined: Jul 2007
Posts: 1,328
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.

Last edited by sparkyinak; 08/07/08 05:18 PM.

"Live Awesome!" - Kevin Carosa

#179976 - 08/07/08 06:29 PM Re: 480 vac Conduit [Re: sparkyinak]  
EV607797  Offline
Member
Joined: Oct 2006
Posts: 745
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.


---Ed---

"But the guy at Home Depot said it would work."

#179999 - 08/08/08 11:42 AM Re: 480 vac Conduit [Re: EV607797]  
shop_test  Offline
Member
Joined: Aug 2008
Posts: 10
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?


#180001 - 08/08/08 12:08 PM Re: 480 vac Conduit [Re: shop_test]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,135
Estero,Fl,usa
I doubt you can weld any raceway. How would you guarantee there was no slag or rough edges inside?


Greg Fretwell

#180003 - 08/08/08 01:06 PM Re: 480 vac Conduit [Re: gfretwell]  
SolarPowered  Offline
Member
Joined: Jul 2004
Posts: 625
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.



#180005 - 08/08/08 02:39 PM Re: 480 vac Conduit [Re: SolarPowered]  
shop_test  Offline
Member
Joined: Aug 2008
Posts: 10
California
How are the dairies getting away with this. A good number of them only except welded conduits?


#180006 - 08/08/08 03:25 PM Re: 480 vac Conduit [Re: shop_test]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,135
Estero,Fl,usa
No inspections?


Greg Fretwell

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