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#174813 - 02/14/08 10:05 AM Welders service Calculations????  
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 835
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


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#174889 - 02/16/08 02:20 PM Re: Welders service Calculations???? [Re: Yoopersup]  
George Little  Offline
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Joined: Jan 2004
Posts: 1,489
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


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