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What size wire do you need for a 240 volt 3 hp well pump that is 400ft from power source?
Wiki User
∙ 10y ago
To answer this question accurately the amperage of the motor must be given.
Using 746 watt equals one horsepower will not be as accurate but will be close to the correct wire size. The equation for amps when HP is known is I = HP x 746/E x %eff x pf. Amps = 746 x 3 = 2238/240 x .84 x .86 = 2238/173 = 13 amps.
A standard motor's efficiency between 5 to 100 HP is .84 to .91.
A standard motor's power factor between 10 to 100 HP is .86 to .92.
A #8 copper conductor will limit the voltage drop to 3% or less when supplying 13 amps for 400 feet on a 240 volt system.
The electrical code book states that a 3 HP motor on 230 volts draws 17 amps. If this is closer to what you pump draws then the wire size will be;
A #6 copper conductor will limit the voltage drop to 3% or less when supplying 17 amps for 400 feet on a 240 volt system.
Wiki User
∙ 10y ago
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