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Old 09-15-2010, 02:55 PM
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One more thing to be considered is the ampere requirement for the compressor motor you get.

Motors up to 1hp can be connected to a 20 amp, 120 volt outlet as long there is no other load on the circuit.

Any motor above 1hp will need a dedicated circuit to power it.

The ampere load of a 2hp single phase motor connected to a 240 volt source is 12 amps at full load. 25% must be added to the 12 amps to determine wire size. #14 wire is rated at 15 amps under normal conditions.

A 3hp motor is 17 amps. #10 wire.
A 5hp motor is 28 amps. #8 wire.
A 71/2 hp motor is 40 amps. #6 wire.

The ampere load of your motor could vary from the above.

Also the capacity of your main service panel needs to checked to see if the motor load can added.

vicrod
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