Welding machine for jewelry store says it needs 208-220V. single phase

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zappy

Senior Member
Location
CA.
But the store has three phase. So does this machine need 208-220V on one wire? I've never heard of 208V single phase. I don't know, maybe it's from some other country that uses a different voltage? Thank you for your help.
 

infinity

Moderator
Staff member
Location
New Jersey
Occupation
Journeyman Electrician
That's how I wired it, but I was thinking maybe just maybe it's something else. And that machine is costly! Thanks.
Sounds like you got it right. Single phase 208 is very common in commercial applications.
 

Electric-Light

Senior Member
Motors usually maintain full performance, but resistive heating appliances have to be derated 25% on 208v, I don't know about that welder, but its worth checking.

208v is common in multi-family houses and apartment buildings. Appliances are designed for 208 or 240, because they're both common, but boiling water, pre-heating the oven, water heater recovery all takes 33% longer on 208v.

Take a look at an electric water heater when you get a chance. You'll see the derated wattage at 208v on the label.
 
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