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Thread: 18 awg max amp

  1. #1
    Join Date
    Jan 2018
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    Default 18 awg max amp

    I googled a lot, bit found no real answer. I need to run a 2 wire power cable 66 feet from PSU to RGB amp, max amps that amp will pull is 4.5, I would like to T off the same line at 33 feet to an additional RGB amp. This would keep me from using so much wire. However, I cant seem to find if this will work.

  2. #2
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    Jan 2018
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    Default Re: 18 awg max amp

    I know this works on my 100 count tombstones, but that is only 20 feet of wire and 2 tombstones on 1 wire

  3. #3
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    Dec 2012
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    Default Re: 18 awg max amp

    Do a google search for "resistance per foot chart". You will find a table that gives you common resistance per foot of wire for a given gauge of wire. Using that and your estimated current values you can predict the voltage loss in the wire. If you loose more than is allowed for your application then you need thicker or shorter wires.

    Data from the table (NOTE: This is for solid wire, use a different table for stranded):
    Common Wire Gauges
    AWG wire size (solid) Diameter (inches) Resistance per 1000 ft (ohms)
    18 0.0403 6.385
    16 0.0508 4.016
    14 0.0640 2.525
    12 0.0808 1.588


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  4. #4
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    Default Re: 18 awg max amp

    It all looks like it will handle it, but I think the one thing I did not take into consideration is that I am unsure how many amps the traces on a distro board can handle. I can always out in a larger fuse but not sure the trace will handle it.

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