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how to calculate electrical capacity for a 400amp 3phase service laundromat

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    how to calculate electrical capacity for a 400amp 3phase service laundromat

    Please help me. I have a small laundromat with a 400amp 3phase service. my service Amp load on my 3phase equip is 63amps and on my singlephase 120v equip is a total of 338amps@120volts. so its 63amps + 338=401amps plus an additional lets say 100amps for lights and 1A/C. Now im doing an addition and adding only 5amps of light, another A/C maybe 30amps and 5 stackdryers@ 16amps each and 9 washers which are add upto 51amps 3phase...so the total for new equip will be equal to another 51amps 3phase and 115amps single phase=166 total amps.
    when combined the old and new---it will be 114amps at 3phase + 553amps single ph which equals to=667amps total...
    my contractors electrician seems is gonna bail out. the city inspectors passed everything except electrical---they want the Load calculation done before inspecting and the electrician doesnt seem to know how to do it....
    so my question is---will my electric service is adequate enough? and how or who can do load calculations for me in dallas, tx? PLease Please help me---everyone i talk to and read on the net says i have enough electrical---i need someone who is very knowledgable to a give me an answer.....please.

    #2
    To a great extent it will depend on the duty cycle of the equipment. The answer will likely require your meeting on site with a competent electrical contractor or engineer.
    With that said:

    [COLOR=black]I am closing this thread, in accordance with the Forum rules. This Forum is intended to assist professional electricians, inspectors, engineers, and other members of the electrical industry in the performance of their job-related tasks. However, if you are not an electrician or an electrical contractor, then we are not permitted to help you perform your own electrical installation work.


    If I have misjudged the situation, if for example this project is related to your work, then send me a Private Message. If you can show me that I am wrong, and that you are a licensed electrician (or at least a licensed apprentice), then I will reopen your post, and offer an apology for the delay and inconvenience.

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