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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.
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.