Wire Size choice for long RunsVoltage autumn becomes crucial when the length of a run of cable or cable becomes an extremely long. Commonly this is not a problem in circuits in ~ a house, however may come to be an concern when running wire come an outbuilding, well pump, etc.Excessive voltage autumn can cause loss of effectiveness in procedure of light, motors and also appliances. This could result in lights that space dim and also motors or appliances with a to reduce life.To avoid extreme voltage drop, choose a size wire that will minimize voltage drop. You require to understand the length of the cable run and the load (current) that will certainly be top top the circuit. To recognize the load, include up the wattage of every electrical gadgets that will be ~ above the circuit and also divide this full by the voltage of the circuit, normally 120 volts or 240 volts.
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|Length the Run|
|Aluminum||1/0||1/0||2/0||4/0||300 MCM||100 AMP**|
|Copper||3/0||3/0||3/0||300 MCM||500 MCM||200 AMP***|
|Aluminum||250 MCM||250 MCM||300 MCM||600 MCM||900 MCM||200 AMP***|
|Length the Run|
*The tables assume steel conduit, a power factor of 0.9, an approximately temperature that 86°F, and also no an ext than 3 current-carrying conductors. We have taken reasonable treatment to create the accuracy of these values; however, this tool is intended only as a guide, above a expert engineer to identify suitability for your application.**Based top top 60°C per NEC 110.14(c)(1)(a).***Based top top 75°C per NEC 110.14(c)(1)(b).
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