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#154363 - 06/08/05 11:59 PM art 630  
OreElect  Offline
Member
Joined: Mar 2004
Posts: 98
Salem,Oregon.USA
Hi all.
Question for load calculation.
Ive got 2- 50 amp 480 volt 1 ph 70% duty welders.
Using the multiplier .84 for the 70 % duty cycle, I am to use this on the first 2 welders correct?
Also,if using a 3rd welder,using the 85 %,is this 85% of the .84 multiplier.
Your opinions appreciated


Building Codes & Related References

#154364 - 06/09/05 01:45 AM Re: art 630  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,057
Estero,Fl,usa
That's the way 630.11(B) reads to me

(B) Group of Welders. Conductor ampacity shall be based on the individual currents determined in 630.11(A) as the sum of 100 percent of the two largest welders, plus 85 percent of the third largest welder...


Greg Fretwell

#154365 - 06/09/05 09:00 AM Re: art 630  
Ryan_J  Offline
Moderator
Joined: Aug 2003
Posts: 1,374
West Jordan, Utah, USA
I have moved this to the NEC forum. Please post your comments here:

http://electrical-contractor.net/ubb/Forum2/HTML/002126.html


Ryan Jackson,
Salt Lake City


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