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How do you calculate what gauge wire you need to use over very long distance runs like 500 ft on 3 conductor solid copper wire at 1.5 amps and 120V formula or way to calculate for various lengths amps?
Wiki User
∙ 11y ago
There are formulae, but it is much easier to simply use a "voltage drop calculator" (many interactive ones can be found online), plug in your values and increase your conductor size until the calculated voltage drop over the required distance, at 1.25 times the required load (80 percent design factor), does not exceed 5 percent (the allowed voltage drop in USA and Canadian electrical codes, other countries vary).
For instance, your example could use 14 AWG, giving you a 4.8 percent drop, or 12 AWG for a 3 percent drop (assuming copper). If you were to use aluminum, you would need the larger conductor.
Wiki User
∙ 11y ago
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