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fuse size for #10 wire

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  • fuse size for #10 wire

    Is it 30 amp or 40 amp max? And how about #6 wire? Thanks.
    2 Kyocera 130, 2 Kyocera 135, Tristar MPPT 45, SureSine 300, Iota 30r TS, 420 amps battery juice, 5000 watt and 2500 watt gen, lots of wire...

  • #2

    Re: fuse size for #10 wire

    Re: fuse size for #10 wire

    Depends... Are you going with NEC (National Electric Code)? Is the wire type Listed in the NEC? Is it going in Conduit? Conduit Fill Factor? Open Air?

    This chart lists maximum amperage (no insulation type listed) for chassis (open air?) type wiring.

    For example, typically NEC lists 14 AWG as 15 amp fuse. That chart lists at 32 amps maximum. For sending energy any distance, it seems to be very conservative (14 awg = 5.9 amps).

    This chart seems to list generic NEC type ratings (fill factor?).

    If you are going to do this a lot using "house wiring"--then you should get a copy of the current NEC. (no--I don't have a copy ).

    -Bill
    20x BP 4175B panels (replacement) + Xantrex GT 3.3 inverter for 3kW Grid Tied system + Honda eu2000i Inverter/Generator for emergency backup.

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    • #3

      Re: fuse size for #10 wire

      Re: fuse size for #10 wire

      Thanks Bill., The NEC chart is what I was looking for. I book marked it. It is for the battery bank back to the panel. I am using #10 right now and would like to fuse it at the post via the Blue Sea terminal post fuses that Tony talks about. I ordered a 40 amp and now will ask them to change to a 30 amp fuse.
      2 Kyocera 130, 2 Kyocera 135, Tristar MPPT 45, SureSine 300, Iota 30r TS, 420 amps battery juice, 5000 watt and 2500 watt gen, lots of wire...

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      • #4

        Re: fuse size for #10 wire

        Re: fuse size for #10 wire

        I've always used the romex calc,
        10ga = 30A
        12ga = 20A
        14ga = 15A
        http://tinyurl.com/LMR-Solar
        http://tinyurl.com/LMR-BigLug
        http://tinyurl.com/LMR-NiFe

        Grundfos 10 SO5-9 with 3 wire Franklin motor (1/2hp 240V 1ph # 214505 ) on a timer for 3 hr noontime run - Runs off PV
        Powerfab poletop PV mount | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe battery | 15, Evergreen 205w "12V" PV | Midnight ePanel || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT

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        • #5

          Re: fuse size for #10 wire

          Re: fuse size for #10 wire

          The NEC charts are based on heating per foot which does not assure a satisfactory voltage drop for any given total run length.

          Wire types that have multiple layers of insulation like SOOW cord have a lower max current rating for their wire size because of inability to dissipate heat. The heat dissipation also derates for number of current carrying conductors in a conduit/cord bundle which generates more heat in a given confined area.

          Original reasoning was elevated heating will progressively degrade wire insulation, making it brittle. Modern wire insulation is much better at resisting enbrittlement.

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