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extension cord questions

Discussion in 'Electronic Basics' started by Eric R Snow, Jun 25, 2006.

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  1. Eric R Snow

    Eric R Snow Guest

    Greetings All,
    Let's say I have two extension cords, both 50 feet long. I need to use
    both to reach a device that is 90 feet away from the receptacle. One
    is 12 gauge and the other is 14 gauge. Looking in the book I find the
    voltage drop for each cord and add them together. The total voltage
    drop at the required amperage is acceptable for the device plugged
    into the cords. Two questions: Does it matter which cord is plugged
    into the power source? And is my assumption correct about adding the
    voltage drops?
    Thank You,
    Eric R Snow
     
  2. Tom Biasi

    Tom Biasi Guest

    No and yes.
     
  3. hi,
    since the current (ampereage) flowing through both the cords is same,
    it does not matter whichever cord u connect first. the voltage drop
    will be sum total of both. u r right.
     
  4. Alan B

    Alan B Guest

    I'm agreeing with the other posters, and noting out that this is one of
    many points where a common analogy - comparing electricity to water flow
    and pressure - breaks down.

    I also want to caution that you should look at peak current as well as
    continuous current before you connect your hundred foot cable. Is the
    device you wish to use one that requires a high starting current, for
    instance an air compressor? In that case, the voltage drop in the cable
    with the inrush current might well be high enough to prevent proper
    operation.
     
  5. Eric R Snow

    Eric R Snow Guest

    Thanks for all the responses folks. It's nice to know I was thinking
    about this correctly. And the device is a battery charger this time so
    a high current inrush won't be a problem now. I do know about motors
    drawing many more amps when starting than running and always size
    wiring for them that takes this into account.
    ERS
     
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