Is a fused disconnect switch or disconnect switch required by Code adjacent to a motor with circuit breaker protection already at the panel? Please help.
And if for some reason you would like to have the added flexibility of being able to open and close the disconnect under load, you will be better off with a circuit breaker instead of a switch and fuses.If the motor is large and the available fault current at the disconnect exceeds 10,000 amps, you will need a fused disconnect. As far as I know none of the non-fused disconnects are listed for use where the fault current exceeds 10,000 amps.
If the motor is large and the available fault current at the disconnect exceeds 10,000 amps, you will need a fused disconnect. As far as I know none of the non-fused disconnects are listed for use where the fault current exceeds 10,000 amps.
And if for some reason you would like to have the added flexibility of being able to open and close the disconnect under load, you will be better off with a circuit breaker instead of a switch and fuses.
I don't think so. It is my understanding that you only get the higher fault current ratings with a fusible disconnect.but the fuses are not required to be part of the switch. they could be upstream.
Interesting, is this standard ie a squared interlock switch accessory for the ds opens before the disconnect contacts standard or is this a special feature?or you could add an early break interlock aux wired into the motor starter circuit.
I don't think so. It is my understanding that you only get the higher fault current ratings with a fusible disconnect.
I don't think so. It is my understanding that you only get the higher fault current ratings with a fusible disconnect.