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Can I run a 250 ft. extension cord to power about 500 watts of musical equipment?

Discussion in 'General Electronics' started by BJ_Selman, May 20, 2004.

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  1. BJ_Selman

    BJ_Selman Guest

    I keep getting mixed messages about this. Basically, we got a storage
    shed to have band practice in, but the outlet for power is about 100
    yards question is even if we ran two long extension cords,
    would it fry the cord or our equipment? we are pulling about 400-500
    watts with our amps. is this possible? is there something we can put
    in between to amplify the signal?
    thank you,
  2. Rich Grise

    Rich Grise Guest

    What it will do is the resistance of the extension cord will reduce the
    available voltage, albeit not by a whole heck of a lot. You can get heavy
    duty long extension cords, but they're kinda pricey. Go to your local
    home handyman warehouse store and find the oldest salesguy there and ask
    him this question.

    You can look up how much wire loss there will be for various sizes of
    conductors - if you can afford #10, do it, and it should run pretty
    good. 500 watts at 120V line voltage isn't quite 5 amps; for a 6-foot
    cord, #16 would be fine. For 50, I'd go to #14, for 100, #12. But these
    numbers are just off-the-cuff stuff - the numbers are probably printed
    on the cardboard sleeve the cord comes in at the store.

    Be sure to use 3-conductor wire, so you have a good safety ground.

    (I once made 115V 60Hz come out a speaker amp, on a damp concrete
    floor barefoot. It got there by way of the guitar strings and my
    hand. BZZZAT!)

    Good Luck!
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