Posted by John T on October 17, 2022 at 13:57:03 from (45.16.200.171):
In Reply to: Re: Shop Wiring posted by Geo-TH,In on October 17, 2022 at 11:49:42:
Thats right the current drawn from the primary (your 240 volt input source) depends on the secondary welding current, I don't doubt your experience one bit !!!!!! As long as you weld at low enough current so will the primary current draw be low HOWEVER if you need to weld at high current for a long enough time YOU WILL LIKELY EVENTUALLY TRIP A 30 AMP THERMAL MAGNETIC CIRCUIT BREAKER on a typical 50 Amp input welder Well DUH lol
But if you dont weld at max high current a real long time, you can get by with ONLY a 30 Amp Branch Circuit and NEVER cause a trip WELL DUH
Every time I designed or installed a branch circuit for a welder, I specified adequate capacity to match the welders max welding capacity, I nor my boss nor the NEC as I best recall, would allow anything less BUT HEY THATS JUST ME AND HOW I UNDERSTOOD THE NEC even if sure less will work if you dont weld at high current for long enough times TO EACH THEIR OWN WIRING CHOICES is fine by me. Connect your 240 Volt 50 Amp welders with 30 amp service and you can for sure get by just fine SUBJECT TO WHAT YOURE WELDING for how long
John T Long retired n rusty power distribution engineer so no warranty things change
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