Please Help Clarify - 220v from 208v-120v Txfmer

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llrodriguez

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All to often I hear of need for a 220v circuit for shop equipment or telcom equipment - I just need to clarify that 220v can be taken from a normally operating 208/120v txfmer and/or panel.

If 240v is needed however, then a second txfmer (240v/120) would need to be installed to power any 240v equipment????

thank you
 
Re: Please Help Clarify - 220v from 208v-120v Txfmer

220-volts and 240-volts are effectively the same thing. 220-volts nor 240-volts can be derived from a 208Y/120 volt system.
 
Re: Please Help Clarify - 220v from 208v-120v Txfmer

Are there really any products out there with a voltage rating of 220 volts @ 60 cycles?

IMO 220 is just slang, not a 'real' voltage rating.
 
Re: Please Help Clarify - 220v from 208v-120v Txfmer

220V is not a standard voltage in the United States. It is a slang term for a nominal 240V system. Supply systems are always listed as nominal voltages such as 120, 208, 240, 480, and 600V. Utilization equipment (stuff with motors) intended for connection to these nominal voltages are usually labled 115, 200, 230, 460, and 575V respectfully.

You cannot get any different voltages from your system other than the nominal 208Y/120 unless you use a transformer. There are standard 2 winding transformers that can be used to go from 208 to 240V or you can use a buck-boost arrangment to boost your voltage. The most common boost ratios are 208 to 229V (10%) or 236V (13.3%).
 
Re: Please Help Clarify - 220v from 208v-120v Txfmer

Is a buck-boost transformer an autotransformer?
 
Re: Please Help Clarify - 220v from 208v-120v Txfmer

Yes "220V." as well as "110V." & "440V." are obsolete & slang terms used by non-electrical persons. I'm talking the good old USA, because in some other countries I believe there are in fact 220V. systems.

I believe that in the USA, the 110, 220, & 440 nominal utilization voltages were phased out many, many years ago.
 
Re: Please Help Clarify - 220v from 208v-120v Txfmer

I agree with kiloamp that the terms were phased out years ago, but the voltages are still relatively accurate. The utility can deviate 5% below 120 volts and a feeder-branch circuit is considered functional with another 5% drop. 120 volts - 12 = 108 volts at the utilization equipment.
Jim T
 
Re: Please Help Clarify - 220v from 208v-120v Txfmer

I keep wondering about this question myself. I don't see much three phase and don't have to deal with it but if I did, what would I do to power a 240 appliance from 208? Are there appliances for 208? :confused:
 
Re: Please Help Clarify - 220v from 208v-120v Txfmer

Check the nameplate of your appliance. Some are rated for both voltages. Dual rated appliances with heating coils (range, dryer, heaters) would not produce as much heat at the lower voltage but would work. If the appliance is not dual rated you can add a buck/boost transformer to boost the voltage.
 
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