2/19/2023 0 Comments How to size breaker fla motorWhat is MOP? Maximum Over-Current Protection (MOP) is a calculated value that determines the maximum size of the over-current protection device (fuse or breaker).The wire size takes into account the normal current draw, ageing of components and anticipated faults. It is chosen to guarantee that the wiring will not overheat under the expected operating conditions. The minimum circuit ampacity (MCA) is also used to figure the minimum wire size required for a field wired product. More specifically, MCA is the highest steady-state electrical current that the rooftop unit should see when operating correctly. What is MCA? Minimum Circuit Amps (MCA) is a calculated value that specifies the minimum main power wire size.Understanding these ratings, and their relationship to each other, is critical to properly selecting wire and circuit breaker sizes. The minimum circuit ampacity (MCA) and maximum overcurrent protection (MOP) ratings provide guidance for safely connecting field-wired equipment to the building mains. To start this discussion, we first need to know what MCA and MOP are. On commercial equipment, there is some information on the data plate of the unit that has to do with safely wiring and protecting the equipment.
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