ABB S6H (and MSB-9) are Molded Case Circuit Breakers with electtronic tripps, ABB S6H is in a Y/Delta Starter with motor over loads (not sure what they are), Yes it is working now and yes there is a question regarding the prtection of the wire.
Thanks for you response.
Some believe that from the Switchboard to the Starter cabinet is a feeder others believe this is a Motor Branch Circuit. I can not find in the Code where it makes a clear distinction as to how this particular installation/application would be classified. Any further clarification or comments would be greatly appreciated.
Thanks for your replies Don & Worm,
Let me shed a little more light on the situation & system (I had asked the question very open/generalized as to not to lead anyone, I wanted honest interpolations/options first). This is an existing system that we are performing an Fault Current, Coordination & Arc Flash Hazard Study on. During a review the existing circuit breaker sizes vs. the wire sizes were questioned and it was suggested that the either the wire sizes or breaker sizes needed to be changed, but this is not everyone?s option. Some believe that from the Switchboard to the Starter cabinet is a feeder others believe this is a Motor Branch Circuit. I can not find in the Code where it makes a clear distinction as to how this particular installation/application would be classified. Any further clarification or comments would be greatly appreciated. See the attached sheets for more detail regarding the existing installation.
If it is a single motor, it really doesn't matter if you call it a feeder or a branch circuit. The required wire size is the same in either case and in either case you can use a thermal magnetic OCPD with a rating of 250% of the motor full load current from Table 430.250. In this case the ampacity of the conductors must be at least 451.25 amps. The installed conductors have an ampacity of 460 amps so they are compliant. ....