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art 630 #93751 06/08/05 11:59 PM
Joined: Mar 2004
Posts: 98
O
OreElect Offline OP
Member
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

2017 / 2014 NEC & Related Books and Study Guides
Re: art 630 #93752 06/09/05 01:45 AM
Joined: Jul 2004
Posts: 9,513
G
gfretwell Offline
Member
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

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