I need to use my miller 175 at a shop were they are 4 prong plugs all around the room that say "250 volts, 30 amps". Is there such a thing as a 250 volt system, or is it just a 230 volt system. They are running bandsaws and such off these plugs right now.
I just want to make sure before I plug the welder in and screw something up.
I would defiantly check it out with a multimeter. No sense in screwing up a welder. As for the 4 prongs, its probably due to new standards (2 hot wires, 1 neutral and 1 ground). If yours is a 3 prong you could just make an adapter for it and leave the neutral out.
The only reason you need four prongs for 220V is when you also have 110V in the appliance - like the lights on a range or dryer. Possibly the bandsaws have a light in them? Otherwise for 220V you only need the two hots and the ground like RockRunner says. A neutral does nothing for 220V systems since they are inherently balanced.
I need to use my miller 175 at a shop were they are 4 prong plugs all around the room that say "250 volts, 30 amps". Is there such a thing as a 250 volt system, or is it just a 230 volt system. They are running bandsaws and such off these plugs right now.
I just want to make sure before I plug the welder in and screw something up.
I have a twist-loc 250v plug for my compressor even though it's only designed for 220v. The 250v designation is only a rating. I have some power tools that are rated at 120v but I know they will never see more than 110v unless a spike occurs in the circuit.
Chances are it is only 220-240V, but I know at my house the voltage is about 250. It should not hurt anything to run it at that voltage, but there should be an acceptable power range listed on your machine or in its manual.
250V is the rating of the plug. 240V is a common 'nomimal' system voltage. (actual usually 220-240V). You may even find 208V with this type of plug is the building is fed with a 3Ø system. Motors are rated at voltage less than nominal to allow for voltage drop.
Regular '110V' plugs are often rated at 125V.
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