60 amp aluminum wire size11/19/2023 ![]() feed from the sign to the lights if installed on opposing leg of 240v feed. You shouldn't need more than #12 for the 115 Ft. Serious explanation is needed for why anybody would specify a 60A panel!ġ20v, 16A, 400ft, 5% loss fed from service panel, gets you #6 copper. The aluminum feeder will work fine since we are going panel-to-panel, so we're running between lugs that are either made for aluminum, or are aluminum.Īssuming since this is commercial that it is probably 208v 3Ø, and that whoever told you you needed a 60A panel knew that signs and lights were rated as continuous loads, and they told you 60A panel based on 125% of actual load, and your voltage drop tolerance is 3%, then you are looking at about #2 awg copper or 2/0 aluminum.Įdit: Your update changes things. If we go with the 2-2-2-4 MH feeder, we're at 3.13% which is completely acceptable anywhere but maybe Canada, and even there it's within the margin of error, for Pete's sake. We have to go clear up to #6 just to get 4.71% drop, but that makes more sense since it's much more expensive than the MH feeder I mentioned earlier. The minimum legal size is #10 copper, but that's right out, giving 11% voltage drop at 16A. The 120V load is probably at least 10A (since it's demanding a 20A dedicated circuit) but should not be more than 16A continuous as that's too much for a 20A circuit.Īnd when we consider voltage drop at 120V, that's a very grim picture. Which really throws a wrench into it, unfortunately. This means you really need to do your voltage drop calculations on 120V not 240V. Given your application, the power usage is 120V and wildly lop-sided onto one leg. (not so good for #10, but not our problem). The difference is aluminum, which is absolutely fine for large feeders of #2 size. An oddity of wire economics is that 2-2-2-4 "MH Feeder" (90A 100A if service) is about the same cost as 10-3 UF-B cable (30A).
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