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Thread: 125% of largest motor

  1. #1
    Join Date
    Jul 2005
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    Tennessee
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    125% of largest motor

    In the past few months i have completed two courses on Residential Load Calculations. Although both contained much of the same info, I noted one emphasized a step adding 125% of the largest motor load to the final calculation whereas it is not mentioned in the other.
    In looking at MH calculation tools I don't see that 125% figure. Has anyone noted form testing if such a number should be included when calculating load ?
    At my age, I'm accustomed to restaurants asking me to pay in advance, but now my bank has started sending me their calendar one month at a time.

  2. #2
    Join Date
    Dec 2010
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    1,314
    I have seen it as a requirement from a number of utility companies.
    The more they overthink the plumbing, the easier it is to stop up the drain

  3. #3
    Join Date
    Jun 2006
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    Ohio
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    Quote Originally Posted by augie47 View Post
    In the past few months i have completed two courses on Residential Load Calculations. Although both contained much of the same info, I noted one emphasized a step adding 125% of the largest motor load to the final calculation whereas it is not mentioned in the other.
    In looking at MH calculation tools I don't see that 125% figure. Has anyone noted form testing if such a number should be included when calculating load ?
    The extra 25% for the largest motor is actually required under standard calculation. It seems many, including AHJ's, overlook it in residential calculations... especially if the motor is part of an appliance.
    I will have achieved my life's goal if I die with a smile on my face.

  4. #4
    Join Date
    Jan 2009
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    Maryland
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    11,897
    Many times the HVAC contains the largest motor and when it is calculated at 125% and 220.50/430.24 is satisfied.

    Problem is that it is not always stated clearly by authors.
    "Electricity is really just organized lightning." George Carlin


    Derek

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