In order to provide any safety the control circuit would need to have a sequencer switch to insure one pump was up to RPM before the second pump could start to prevent a simultaneous draw of start current. The problem with that reasoning is that if you provide 30amps to a motor that only requires 5amps to run, you would have flames coming out of the motor before the circuit breaker would trip out. If they have both motors on a common circuit the combined run current should then be approximately 10amps, however, the instantaneous start current would be 15amps x 2 or 30amps, which explains why they told you to install a 30amp breaker. That is technically defined as the "Locked Rotor Amperage" and is typically 3 times the normal run amps of the motor, therefore the instantaneous start current would be in the order of 15amps, howerver the locked rotor current is normally an instantaneous draw that only lasts a few milli-seconds and a breaker that is properly sized to the motor will tolerate the short duration of start current. When a motor starts it requires a momentary surge of power to overcome inertia and start the armature rotating. Watts = voltage x amperage,therefore we can divide the wattage by the voltage to determine the amperage.Īllowing that motors are not 100% efficient, the actual motor rating is probably in the order of 220v 5a This is being supplied by a double pole breaker, therefore it is a 220v circuit which is also typical of residential well pumps. Typically a residential well pump is a 1HP pump. Something is not making a whole lot of sense to me here.
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