The Electrical Contractor Network

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

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Correct rotation, wrong sequence
by Potseal
Yesterday at 03:14 PM
Industrail Control Panel bonding per 409.108
by sparkyinak
12/09/16 06:29 PM
Calling all Non-US members!! (Non-US only)
by aussie240
12/07/16 02:39 AM
Photo Upload Tutorial
by DanK
12/06/16 11:35 PM
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 11
HotLine1 10
Potseal 9
sparkyinak 8
Texas_Ranger 7
Who's Online
1 registered (geoff in UK), 205 Guests and 5 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#174813 - 02/14/08 07:05 AM Welders service Calculations????
Yoopersup Offline
Member

Registered: 03/04/03
Posts: 826
Loc: Michigan
(13) 480 volt three phase. Spread around a 100000 sq. ft Plant for maintance. Motor generator type. 60 amp plug ins no info on welders at this time. What would the load you"d have to figure for the service be??
Would it be 630.11 (B).
Also if you jumped from welder to welder say 3 in a row.
Wire size & Breaker size??
Kinda Got a IDEA but never to proud to ask.
Yoopers

Top
2014 / 2011 NEC & Related Books and Study Guides
#174889 - 02/16/08 11:20 AM Re: Welders service Calculations???? [Re: Yoopersup]
George Little Offline
Member

Registered: 01/18/04
Posts: 1492
Loc: Michigan USA
Ernie— Kinda tough to give wire and breaker size with no known specs. I don't know what you are suggesting when you say jump from welder to welder. I would say that 630.11(B) is the article for calculating the supply conductors and the load for the Service. At least that's how I'd call it. Bearing in mind all conductors must be protected at their ampacity per 240.4 and then there is the provision in 240.4(G) for welders. I've never been real comfortable with the fusing on conductors for welders but that's what it says and I guess there is a good track record. I know, let's ask the Design Professionals that question. I don't know what they will say since their kinda quiet on this issue.
_________________________
George Little

Top



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