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Thread: fuse size for #10 wire

  1. #1
    Join Date
    Feb 2008
    Location
    Gila Wilderness, NM
    Posts
    190

    Default 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. #2
    Join Date
    Mar 2006
    Location
    SF Bay Area (California)
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    21,264

    Default 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.

  3. #3
    Join Date
    Feb 2008
    Location
    Gila Wilderness, NM
    Posts
    190

    Default 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...

  4. #4
    Join Date
    Sep 2006
    Location
    Willits, CA
    Posts
    5,704

    Default Re: fuse size for #10 wire

    I've always used the romex calc,
    10ga = 30A
    12ga = 20A
    14ga = 15A
    http://tinyurl.com/LMR-Solar
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    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
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  5. #5
    Join Date
    May 2006
    Location
    Florida, USA
    Posts
    1,274

    Default 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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