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

[zappy]

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.

 

[norcal]

But the store has three phase I've never heard of 208V single phase.

208V 1 ? is 2 legs from 208Y/120V.

 

[zappy]

208V 1 ? is 2 legs from 208Y/120V.

That's how I wired it, but I was thinking maybe just maybe it's something else. And that machine is costly! Thanks.

 

[infinity]

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.

 

[220/221]

I've never heard of 208V single phase

The service to the building is 120/208 3 phase but two pole, single phase branch circuits are common.

 

[Electric-Light]

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.