Wire Size selection for long Runs

Voltage 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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120 Volt, Conductor dimension (AWG or kcmil)Single Phase, Max 3% Voltage Drop*
Length the Run
Copper1412108615 AMP**
Copper121286420 AMP**
Copper101064430 AMP**
Copper1112/04/0100 AMP**
Aluminum1/01/02/04/0300 MCM100 AMP**
Copper3/03/03/0300 MCM500 MCM200 AMP***
Aluminum250 MCM250 MCM300 MCM600 MCM900 MCM200 AMP***

240 Volt, Conductor size (AWG or kcmil) solitary Phase, Max 3% Voltage Drop*
Length of Run
Copper141412101015 AMP**
Copper12121210820 AMP**
Copper1010108630 AMP**
Aluminum8886430 AMP**
Copper8886440 AMP**
Aluminum6664340 AMP**
Copper6666450 AMP**
Aluminum4444250 AMP**

*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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