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    Vanilla Lace's Avatar
    Vanilla Lace Posts: 1, Reputation: 1
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    #1

    Oct 19, 2006, 04:28 PM
    How to calculate electrical service needs
    My husband and I frequently do art shows. The only electricity we need is to power six clamp-on lights, each using a 65 watt bulb. For the first time ever, we are being asked to request the type of service we need, i.e. up to 600 watts or 5 amps, up to 1000 watts or 8.3 amps, etc. I hate to be ignorant but I'm clueless. Do I calculate the total watts of the bulbs I'm using? Or is there a better way to ensure that I order the appropriate service?

    Thank you soooo much,
    ceilingfanrepair's Avatar
    ceilingfanrepair Posts: 5,733, Reputation: 109
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    #2

    Oct 19, 2006, 05:03 PM
    Six 65 watt bulbs is 390 watts, so you need at least that. I'd go with the 5 amp service so you have a little extra should you need it. This isn't the official answer, TK will tell you more.
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #3

    Oct 20, 2006, 02:56 AM
    Ceilngfanrepair is correct.

    Total the wattage of the lamps you use 6 x 65+390 watts

    To arrive at the amps, divide the watts by the voltage, which is usually 120 volts.

    Amps = watts/volts
    Amps= 390/120
    Amps=3.25 total amps

    Request at least 600 watts or 5 amps to have some spare power for fan, calculator, etc.

    They manager of power must add up all the vendors power requirements, and the total must be fed by a distribution system that is 25 % larger than the totla connecte4d load, if the event will operate longer than 3 hours, which we consider as "continuous" load.

    The event planner must have a limited amount of power where this function will be held, and is asking all vendors for their exact power requirements , so as to be sure there is enough power to go around for all vendors.
    nante's Avatar
    nante Posts: 1, Reputation: 1
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    #4

    Feb 13, 2010, 07:02 AM
    3.5 amp your total watts, use 15 amp circuit breaker ligthing protection, 2.0mm thhn wire, heavy duty lamp receptacle & switch. For your safety, OK? [email protected]
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #5

    Feb 13, 2010, 07:22 AM
    Please refrain from replying to questions older than few months.

    This thread is over three years old.

    And my calculation of total amp load is still 3.25 amps, not 3.5.

    This thread is closed.

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