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ABYC 7 circuit protection rule-gctid402270

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    ABYC 7 circuit protection rule-gctid402270

    How do I determine what size fuse I should use to protect my house batteries and my start battery? House batteries are 4 6v (no amph rating on them!), and the start is a regular 12v 850 cc A battery.

    #2
    You rate the House Battery fuse based on the cable size/capacity to the house bank. If the House Bank and the cabling is in the engine bay you reduce the fuse rating by about 10% below the cable capacity.

    I assume you are planning to install one of the battery terminal style house bank fuses. I installed one a couple of years ago.

    The ABYC specifies fuses are not required or recommended for starting batteries.
    Jim McNeely
    New Hope a 2004 Bayliner 305 Sunbridge Express Cruiser
    Twin 5.7s with Bravo2 drives
    Brighton, Michigan USA
    MMSI # 367393410

    Comment


      #3
      God, what a bone head I am! Of course if I thought about it a bit more then I wouldn't have posted the questions. No different than breaker sizing in residential wiring.

      So yes, I am planning on installing Blue Sea Terminal Fuses on the house bank to protect that circuit, it's fed with a 1/0 cable (where do I find the current carrying capacity of marine cables so I can size the fuse?). I also thought on putting one on the starter battery but not in series with the main motor's starter. I have a Yamaha T9.9, Panther T4 steering system on the starter battery so that was the circuit I was planning on protecting. I suppose the T4 should have it's own fuse since the gage of the wiring is much smaller. I thought of putting everything on the house battery but thought it was a better idea to have the kicker charge up the start battery while in use.

      Gary

      Comment


        #4
        garball wrote:
        God, what a bone head I am! Of course if I thought about it a bit more then I wouldn't have posted the questions. No different than breaker sizing in residential wiring.

        So yes, I am planning on installing Blue Sea Terminal Fuses on the house bank to protect that circuit, it's fed with a 1/0 cable (where do I find the current carrying capacity of marine cables so I can size the fuse?). I also thought on putting one on the starter battery but not in series with the main motor's starter. I have a Yamaha T9.9, Panther T4 steering system on the starter battery so that was the circuit I was planning on protecting. I suppose the T4 should have it's own fuse since the gage of the wiring is much smaller. I thought of putting everything on the house battery but thought it was a better idea to have the kicker charge up the start battery while in use.

        Gary
        Gary,

        The chart in the link should answer your questions.

        [[/url]http://www.marinco.com/page/wire-tech-data
        John Rupp
        1989 2455 Ciera Sunbridge
        5.8 OMC Cobra

        1989 3288
        Starshine
        Hino 135

        Comment


          #5
          garball wrote:
          God, what a bone head I am! Of course if I thought about it a bit more then I wouldn't have posted the questions. No different than breaker sizing in residential wiring.

          So yes, I am planning on installing Blue Sea Terminal Fuses on the house bank to protect that circuit, it's fed with a 1/0 cable (where do I find the current carrying capacity of marine cables so I can size the fuse?). I also thought on putting one on the starter battery but not in series with the main motor's starter. I have a Yamaha T9.9, Panther T4 steering system on the starter battery so that was the circuit I was planning on protecting. I suppose the T4 should have it's own fuse since the gage of the wiring is much smaller. I thought of putting everything on the house battery but thought it was a better idea to have the kicker charge up the start battery while in use.

          Gary
          Gary,

          The chart in the link should answer your questions.

          http://www.marinco.com/page/wire-tech-data
          John Rupp
          1989 2455 Ciera Sunbridge
          5.8 OMC Cobra

          1989 3288
          Starshine
          Hino 135

          Comment


            #6
            Gary

            I have 2/0 cable and I fused it at 250A. I have never blown that fuse even when I stalled the windlass with a monster hunk of the bottom recently.

            For 1/0 the chart says 242A in the Engine Bay. Blue Sea has them for 200A, 225A and 250A as well as smaller and larger.
            Jim McNeely
            New Hope a 2004 Bayliner 305 Sunbridge Express Cruiser
            Twin 5.7s with Bravo2 drives
            Brighton, Michigan USA
            MMSI # 367393410

            Comment


              #7
              Thanks guys for pointing me in the right direction. Here's a resource sent to me by Blue Sea Systems. http://bluesea.com/viewresource/529

              Cheers,

              Gary.

              Comment

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