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What size electrical wire is required for 20 amp breaker 275 feet away on 120 volts?
Wiki User
∙ 9y ago
If the allowed volt drop is 3% or 3.6 volts, the cable resistance should be 3.6/20 ohms (or less).
The total wire length (two wires) is 550 ft so the resistance per ft is 3.6/(20x550) ohms/ft or 0.00033 ohms/ft, or .0011 ohms per metre.
Wiki User
∙ 9y ago
Wiki User
∙ 9y agoA #4 copper conductor will limit the voltage drop to 3% or less when supplying 20 amps for 275 feet on a 120 volt system.If the system voltage could be raised to 240 volts;
A #6 copper conductor will limit the voltage drop to 3% or less when supplying 20 amps for 275 feet on a 240 volt system.
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