The only “Wet” would be from some stray condensation and if the wire was ever “submerged”, I’d be having an entirely unrelated water problem…. With AC (and the calculator set with the AC button selected) do I need “round trip” length?Ģ. wire… if AC does NOT include “round trip” for length… thinking that this is true as 30amp shore power cords of 50′, or, so, are typically 10ga wire). In the “dry” rating I’m well within the range of using 10ga. Wire insulation temperature ratings call out a different rating for “wet” vs “dry”. There would be no area that would normally be “wet”. Length of the run from the new shore power inlet (including a new breaker I will mount within a foot or so of that inlet) would be about 33 feet. However, my intent is to run a new AC 30amp (120v) shore power line that would be housed in a sort of chase-way that exists near where the deck and the hull meet. The wire size calculator mentions that the length need to include the “round trip”. Our wire size calculators use a formula that is based on Ohm's law in order to calculate a diameter for the conductor that keeps the voltage drop below the value you set in the calculator.Īccording to both ISO and ABYC standards, the voltage drop should be kept below 10% in all cases and below 3% for sensitive or safety relevant consumers such as navigation lights, bilge pumps and main feeder cables for switch panels. So when we have longer cable runs, we also need larger diameter conductors, or else the resistance and voltage drop goes too high. The longer and smaller diameter the concuctor the higher it's cumulative resistance. is the voltage that gets lost on the passage from the battery to the consumer and back to the battery as a result of resistance in the conductor. Our calculators use the ABYC and ISO Ampacity Tables as the basis for these calculations. The number of current carrying conductors that are bundled together. ![]() The ambient temperature (whether part of the conductor runs through an engine compartment or not), and. ![]()
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