What is the minimum size feeder required for feeding a softstarter?
I have a softstarter which I will be connecting to motor. The softstarter will be fed from an MCC by cable for some distance. What are the requirements for the size of the cable and breaker in the MCC.
I would think the softstarter would be similar to a VFD which would require a feeder circuit and breaker rated for 125% of the rated input current to the softstarter. Or if not maybe just the typical 125% rating of the motors FLA? The input current and the motors FLA are the same so either way the feeder cable needs to be 125% of motor FLA but I was wondering for future reference what this was based off of?
Am I correct on the 125%?
So for a motor with FLA of 180A I am going to use a 4/0 cable with 250A breaker. Does this sound o.k.?
I have a softstarter which I will be connecting to motor. The softstarter will be fed from an MCC by cable for some distance. What are the requirements for the size of the cable and breaker in the MCC.
I would think the softstarter would be similar to a VFD which would require a feeder circuit and breaker rated for 125% of the rated input current to the softstarter. Or if not maybe just the typical 125% rating of the motors FLA? The input current and the motors FLA are the same so either way the feeder cable needs to be 125% of motor FLA but I was wondering for future reference what this was based off of?
Am I correct on the 125%?
So for a motor with FLA of 180A I am going to use a 4/0 cable with 250A breaker. Does this sound o.k.?