Electrical Panel ?

If the phase to phase voltage is 480v. That means phase to neutral would be 277v? Because 277 x 1.732 is 480v. 

The most confusing thing to me is that in a residential home. You would run two legs to a dryer for a total of 240v single phase.

So if I run two phases of 480v to something, wouldn't the voltage be 480 x 1.732 which is 830 volts?

3 Answers

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  • Anonymous
    2 months ago

    in reality there is no phase to phase

    voltage of 480V anywhere in the world

    All equipment will simply blow up

    at such high voltage

  • 2 months ago

    voltage between ANY two phases = 480

    voltage between A phase and neutral = 480/(3^(1/2))

    so

    "So if I run two phases of 480v to something, wouldn't the voltage be 480 x 1.732 which is 830 volts?"

    becomes redundant

  • 2 months ago

    yes, 480/√3 = 277 volts

    or 480√3 = 830 volts

    From your previous question.... did you actually measure this voltage?  that is the easiest way to resolve this. 

    Yes, in North America, residences are supplied with either:

    240 volts split phase, 120 volts each line

    or

    two legs of 208 volts three phase, with 120 volts each phase, and 208 volts between the two.

    large homes may be supplied with all three phases but still 120 volts each phase, and 208 volts between any two.

    Any higher voltages would result in lights and appliances being damaged, and probably fires. 

    note that the rating on a panel does not tell you what the voltages are.... just that they are less than the rating. 

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