I have a Service Entrance with conductors sized for a 1500A. The load is multiple motors in a MCC. I want to use a PD frame size CB, thermal-magnetic breaker. Am I allowed to round up to 1600A for overcurrent protection, or do I use the next lower size available setting? The MCC bus is 1600A so the 1600CB size would not exceed the bus ampacity.
If I am allowed to round up, does the conductor ampacity need to be increased so it is greater than CB setting?
If I have a Thermal-Magnetic breaker, similar to Siemens SPD, and it is located in a manner that meets the requirements allowing an adjustable setting CB, do I set it for 1500A and call it a day?
Paul
If I am allowed to round up, does the conductor ampacity need to be increased so it is greater than CB setting?
If I have a Thermal-Magnetic breaker, similar to Siemens SPD, and it is located in a manner that meets the requirements allowing an adjustable setting CB, do I set it for 1500A and call it a day?
Paul