Motor circuit breaker sizing calculator: Engineers should check the NEC 430 article While this article presents helpful information about motor circuit breaker sizing, there are still several other things to consider when specifying motors for a particular application. For example, there is still the ...
1. Size the selected motor properly The common practice of motor oversizing results in less efficient motor operation and lower power factor. Some situations may require oversizing for peak loads, but otherwise select a motor that will operate with a load factor between 75% and 80%. Peak ...
The breaker trip could be due to a non-starting motor due to a bad cap as you've diagnosed, but be alert for a motor with failing bearings or a shorted winding too. The fact that your motor starts to rotate and then trips the breaker argues for a motor failure, perhaps a winding th...