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Thread: Voltage Drop vs distance chart available?

  1. #1
    Join Date
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    Voltage Drop vs distance chart available?

    I am wondering if there is a chart of some sort available that will give me wire size needed for varying amperages at a given distance. I am working in a warehouse and am hoping to avoid running alot of caculations. For example I need to place a 30A/240V receptacles at 250 from the panel. Then another at 230 feet and so on. Just hoping there may be a premade answer out there.

    Thanks,

    c2500

  2. #2
    Join Date
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    There on line calculators available, I doubt you will find a chart as there are to many variables.

    A rough method is to bump up a size per 100'

  3. #3
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    Are these receps on the same circuit? And will they both be used at the same time? And what is the actual amperage draw [load] on the circuit (not the recep. rating)?

  4. #4
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    Each recptacle will be on an individual circuit. I would have to guess the max draw would be 24amps.
    c2500
    Last edited by c2500; 01-11-08 at 07:22 PM.

  5. #5
    Join Date
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    IMO voltage drop calcs are a worst case scenario. I fired up parking lot lights yesterday and my calcs said I would have 196V at the last 208V fixture. I have 204V there? Go figure.

    This is not the first time I have noticed this.

  6. #6
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    did you use the Zoltek 99 wireguide?

  7. #7
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    Quote Originally Posted by chris kennedy
    IMO voltage drop calcs are a worst case scenario. I fired up parking lot lights yesterday and my calcs said I would have 196V at the last 208V fixture. I have 204V there? Go figure.

    This is not the first time I have noticed this.
    What was the voltage at the main? You may have started with 215 volts
    instead of 208 volts.

  8. #8
    Join Date
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    Quote Originally Posted by chris kennedy
    IMO voltage drop calcs are a worst case scenario. I fired up parking lot lights yesterday and my calcs said I would have 196V at the last 208V fixture. I have 204V there? Go figure.

    This is not the first time I have noticed this.
    Many variables like starting actual voltage vs. nominal, actual load vs. name-plate, load distributed along the cicruit vs. at the end, etc.

    source>>>>>>>middle>>>>>>>>end
    208>>>>>>>>>>>>>>>>>>>>total load 196
    208>>load>>>load>>>load>>>load>>>Last 204
    Volts 208 207 206 205
    Less load>>>>>>>>>>>>>>>>>>>>>Higher load
    Electric heretic
    It's always gonna be in the last place you look....

  9. #9

    Smile Fast way to do voltage drop

    I don't know of any voltage drop charts but if you have to do a lot of voltage drop calculations then you might as well buy Electric Calc Pro. It is a very nice $100 dollar calculator that solves the voltage drop really easy and much more.

  10. #10
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    Talking That'd be nice.

    Quote- Just hoping there may be a premade answer out there.


    Don't we all:grin: It doesn't hurt to dream.
    Old and in the Way.......

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