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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.

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