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Thread: Whole House Surge Suppression

  1. #31
    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.

  2. #32
    DIY Senior Member BobL43's Avatar
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    Quote Originally Posted by jwelectric View Post
    if the RMS value is 120 then it would be 120 times 1.414 = 169.68
    169.68 times .707 = 119.96
    and the peak to peak voltage would be 120 volts times 2 X the sq root of 2 which would make that voltage about 339 volts.
    I am definitely not a pro plumber, but I am a pro crastinator

  3. #33
    Jack of all trades DonL's Avatar
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    It surprises me that many Surge Protection Power strips are UL listed , but are also claimed to be a fire hazard.
    Theory only works perfect in a vacuum.

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  4. #34
    Jack of all trades DonL's Avatar
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    Quote Originally Posted by BobL43 View Post
    and the peak to peak voltage would be 120 volts times 2 X the sq root of 2 which would make that voltage about 339 volts.
    I think many times people do not really know the rating for what they buy. A true RMS meter is nice and I use a o-scope for reading P-P. It is surprising to see what comes down the AC line.

    I have a computer logger for a AC Line monitor, and it works good when I have it online.

    Seems like if you have a lot of Joules then you must be better, people like large numbers, but where does the surge get dissipated ?. The key is to keep the energy from entering your house like Jim did.


    I prefer having bigger Jewels, My Girl does too.
    Theory only works perfect in a vacuum.

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  5. #35
    DIY Senior Member BobL43's Avatar
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    Quote Originally Posted by DonL View Post
    I think many times people do not really know the rating for what they buy. A true RMS meter is nice and I use a o-scope for reading P-P. It is surprising to see what comes down the AC line.

    I have a computer logger for a AC Line monitor, and it works good when I have it online.

    Seems like if you have a lot of Joules then you must be better, people like large numbers, but where does the surge get dissipated ?. The key is to keep the energy from entering your house like Jim did.


    I prefer having bigger Jewels, My Girl does too.
    Those jewels are the only ones that are important. You cannot buy them in a store at any cost, but if you are a bad boy, you may lose them in your sleep. Elena Bobbit removed the tool, but not the jewels, and John was able to make a loving or (living) on the results. Remember that story?
    I am definitely not a pro plumber, but I am a pro crastinator

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