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Questions about power grid in US

  1. Apr 8, 2011 #1
    1) What's the voltage in the overhead power lines in residential areas? Basically how many volts is it before it gets stepped down to 120 for your house?

    2) What's the typical primary inductance of a distribution transformer that does the stepping down?
  2. jcsd
  3. Apr 8, 2011 #2


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    Staff: Mentor

    This should help with your first question:


  4. Apr 8, 2011 #3
    Thanks, so it's 7,200V.

    Anyone know about the transformer? I imagine the inductance is huge!
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