![]() And also, the compressor ahs an unloader for easier starting. And also let's say nothing else is running or starting when you start your compresssor. ![]() And let's say your voltage is always at a healthy 240 volts. Let's say your motor is wired just a few feet from the breaker panel with a 30 amp breaker and 10 gauge wire. ![]() In case you want to know why a 30 amp circuit is risky, here you go: ( or a larger gauge, such as 6 gauge, but that is overkill in capacity and cost). Also remember, that the breaker size determines the wire size, so the 40 amp breaker requires at least 8 gauge copper wire. The suggested breaker for your motor is 40 amps. Running at full load (or less) at full voltage, and full rpm, then the current will drop down to the rated 21 amps. Think of how the lights dim when that motor starts. That 5HP motor will have an initial inrush current of over 100 amps for the first 1/120th of a second, and then the current will drop down to maybe 40 to 80 amps until the motor reaches full speed, about a second or two. Simple answer: use 40 amp breaker and 8 gauge wire.įor a 5 HP air compressor motor the 30 amp breaker MIGHT work, but it is not suggested, and you might regret it.
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