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Wire size in an invisible fence

Discussion in 'Electrical Engineering' started by John, Nov 22, 2003.

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  1. John

    John Guest

    I ran a bit short while installing an invisible dog fence.
    They supply 20 gauge PE insulated wire.
    Another reel of their wire is $25.
    A reel of 14 gauge regular wire is $12.

    The instruction book cautions against mixing sizes. What difference would
    it make? I am guessing that the heavier wire might radiate a bit wider
    field, but I can live with that. Any other problem you can see?
    I don't know what normal insulation is but guess it is PVC? That is no more
    likely to deteriorate in the ground than PE, is it?

    Any insights would be appreciated. Once it is in the ground it is too late.

    Also, do you think the waterproof wire nuts that HD sells will be okay? The
    ones that came with the kit are more elaborate, but also bulkier and more
    difficult to bury.

  2. daestrom

    daestrom Guest

    The *impedance* difference can be important. Doesn't an 'invisible fence'
    work at radio frequencies? If so, a different impedance could be a problem
    ('reflection' and standing waves??)

    Don't know for sure, never worked with one. Just some thoughts.

  3. John

    John Guest

    I connected it up above ground, and the field was much smaller. I had to
    turn it to the highest setting to get the field size back. I don't know if
    it would work out, but didn't want to mess with it.
    So, I found some 18 guage, and that worked fine; but took a while to find

    If anyone has an explanation why 14 & 20 gauge gives a much smaller field
    than 18 & 20...
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