Wire Size selection for long RunsVoltage autumn becomes important when the size of a operation of cable or cable becomes really long. Normally this is not a trouble in circuits in ~ a house, yet may become an worry when to run wire to an outbuilding, well pump, etc.Excessive voltage drop can reason loss of effectiveness in procedure of light, motors and also appliances. This could an outcome in lights that are dim and motors or appliances through a reduce life.To avoid too much voltage drop, choose a size wire that will minimize voltage drop. You need to understand the size of the wire run and the fill (current) that will be top top the circuit. To recognize the load, add up the wattage of every electrical gadgets that will certainly be on the circuit and also divide this complete by the voltage of the circuit, usually 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 of Run|
*The tables assume steel conduit, a power aspect of 0.9, an ambient temperature of 86°F, and also no an ext than 3 current-carrying conductors. We have taken reasonable treatment to develop the accuracy of this values; however, this device is intended just as a guide, above a expert engineer to recognize suitability for your application.**Based ~ above 60°C per NEC 110.14(c)(1)(a).***Based ~ above 75°C every NEC 110.14(c)(1)(b).
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