La Manzanilla Message Board Archives
Re: Circuit breaker size for cistern pump
Posted by Erin Strench on October 18, 2017, 6:37 pm, in reply to "Re: Circuit breaker size for cistern pump"
Is the breaker a ground fault type, if so, it is probably tripping for a reason, the motor has gone to ground somewhere either within or in the wiring to the pump. Look at the pump, see what the FLA (full load amps) reading is on the label, the breaker should be no larger than three times that amount to allow for the inrush of current when the motor is starting. The circuit should be designed in such a fashion that the closes breaker trips first as it should provide thermal protection for the motor, the second breaker at the panel is basically protecting the wiring to the pump. One issue to look for is that the motor is well grounded, if it is not, the voltage will float and not be consistent and will certainly cause issues. Remember, the lower the voltage, the higher the current (which is what the breakers sense), so you need to check all the factors to ensure proper operation. If there is a serious issue, the motor is fry and then you have a much larger issue to deal with.
My two cents worth.
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