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Thread: Whole House Surge Suppression

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    Electrical Contractor/Instructor jwelectric's Avatar
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    Quote Originally Posted by jadnashua View Post
    120vac RMS has peak voltages considerably higher than 120vac.
    if the RMS value is 120 then it would be 120 times 1.414 = 169.68
    169.68 times .707 = 119.96

    Edited to add;

    The cosine of the angle divided into 1 times the RMS voltage will give you the peak voltage of the sine wave. 1/.707*120=169.68 volts
    Last edited by jwelectric; 07-06-2012 at 08:47 AM.

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