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Electrical Power and Panel Board Ratings

In 220volts 3 phase we see on panel board written 440volts. I’m wondering because when I counting this 3 times as equal to 660volts…


Electrical Power and Panel Board Ratings
Background: Noor, a Electrician from Jalalabad, Afghanistan

Question: Dear sir, In 220volts 3 phase we see on panel board written 440volts. I’m wondering because when I counting this 3 times as equal to 660volts can you explain me about this why 220volts 3 phase known for440volts

Additional Comments: I like it very much because when I face trouble than i’m searching this for electrical essential.

Dave’s Reply:
Thanks for your electrical question Noor.Your calculations are logical, however incorrect. I will have to do a whole section devoted to electrical power and power transformation to explain this further.

I have provided the following links that lead to fully detailed information on this website that will assist you with your electrical question:

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Questions about: Electrical Power and Panel Board Ratings


  1. Bill Tench says:

    My outdoor patio lights failed. A circuit breaker in the fuse box in garage beeps. I assume I should replace this breaker. Comments as to my intended action? Thank you.

    • Dave Rongey says:

      Hi Bill,
      Typically a problem with an electrical circuit does not damage a circuit breaker, it just causes the breaker to trip off. The circuit and the light fixture should be inspected for a faulty condition and repaired as needed. The circuit breaker should then be reset and turned back on to test the circuit for normal operation.

      I hope this helps,
      Dave

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