ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

Page 1 of 3 1 2 3 >
Topic Options
Rate This Topic
#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?
Top
2017 / 2014 NEC & Related Books and Study Guides
#179967 - 08/07/08 02:55 PM Re: 480 vac Conduit [Re: shop_test]
George Little Offline
Member
Registered: 01/18/04
Posts: 1488
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.
_________________________
George Little
Top
#179970 - 08/07/08 03:13 PM Re: 480 vac Conduit [Re: George Little]
sparkyinak Offline
Member
Registered: 07/08/07
Posts: 1307
Loc: Alaska
George is on the money
_________________________
"Live Awesome!" - Kevin Carosa
Top
#179971 - 08/07/08 03:16 PM Re: 480 vac Conduit [Re: shop_test]
sparkyinak Offline
Member
Registered: 07/08/07
Posts: 1307
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)
_________________________
"Live Awesome!" - Kevin Carosa
Top
#179976 - 08/07/08 04:29 PM Re: 480 vac Conduit [Re: sparkyinak]
EV607797 Offline
Member
Registered: 10/25/06
Posts: 744
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.
_________________________
---Ed---

"But the guy at Home Depot said it would work."
Top
#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?
Top
#180001 - 08/08/08 10:08 AM Re: 480 vac Conduit [Re: shop_test]
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9039
Loc: Estero,Fl,usa
I doubt you can weld any raceway. How would you guarantee there was no slag or rough edges inside?
_________________________
Greg Fretwell
Top
#180003 - 08/08/08 11:06 AM Re: 480 vac Conduit [Re: gfretwell]
SolarPowered Offline
Member
Registered: 07/05/04
Posts: 625
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.

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


Member
Registered: 07/20/04
Posts: 9039
Loc: Estero,Fl,usa
No inspections?
_________________________
Greg Fretwell
Top
Page 1 of 3 1 2 3 >

Member Spotlight
Member Since: 07/05/02
Posts: 8211
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
0 registered (), 55 Guests and 10 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 47
HotLine1 43
gfretwell 19
Ruben Rocha 12
Trumpy 9
 
Newest Members
Scotto, Freecrowder, clee512, Jdscott2005, FAIZAN

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals