115 volts taken from 1 of the wires in a 3 phase circuit?
- Thread starter wpod
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you need 2 leads to complete a circuit. If it's 3x115 you can use 2.
Yes, IF you have a neutral. If you don't have a neutral there, it would be unsafe and a code violation to use the ground. This is assuming it's a 208/120 wye 3 phase circuit.
JHZR2
Staff member
If it is a 208V 3-phase you can get 120 between a phase and Neutral. Might need to watch balancing between phases.
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JHZR2
Staff member
The OP could also have 240V 3-phase delta. It's not that common.
I agree.
A while back I purchased a used GE 3kva transformer on Ebay, it was around $100 and that included shipping. Such a transformer could be used to step 480V down to 120V with plenty of capacity to run a welder that can run off a 15 or 20 amp circuit. (My intended use is to step 120V up to 240V to run my well pump off an inverter if I should need to do so in a power outage--it has two coils on both the input and output that can be connected in series or parallel).
Yup..480V
THIS^^^^ PLEASE don't touch it!
Your property is a commercial property? Residential property does not ever have 3 phase, only 120 volt/ 2 pole.
You have 2- 240 volt legs, and 1 Wild leg, usually about 277 volts. That's 3 phase. There is NO 120 volt with out a transformer, the big warm box thingy that makes loud humming noise.
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That's not true at all, there's a lot of residential properties that have 3 phase. It's not standard but if 3ph is available in your area and you want it, most utilities will bring it in to your property. A lot of guys have hobbies that use 3ph equipment and it's easier to get 3ph power than to run phase converters on everything and you don't need to worry about building a big enough rotary converter to run future stuff.
Sorry, I have never seen 480V in a residential property. You would think we would hear of more people Electrified! I'm not shy of 120V, but 480V, I'm wearing my Wiggy even after I double checked ALL breakers off.
It's only available in industrial production in my area.
I'm not sure how much you are acquainted with Electricity so I'm hesitant...
That size motor has to be three phase, It does not matter anyway anything above 10hp is probably three phase anyway.
All motors that size I know of use a MAG starter to turn the on/off, often these mag starters are 120V single pole. That maybe your only power source if there is a Mag Starter with 120V there. Its in its own box, not the main fuse box W/Big candle stix, or the pressure switch. Its in the box W/ the changeable protective heater coils I believe.
That size motor has to be three phase, It does not matter anyway anything above 10hp is probably three phase anyway.
All motors that size I know of use a MAG starter to turn the on/off, often these mag starters are 120V single pole. That maybe your only power source if there is a Mag Starter with 120V there. Its in its own box, not the main fuse box W/Big candle stix, or the pressure switch. Its in the box W/ the changeable protective heater coils I believe.
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