Electric Motors and Maintenance

3. How To Calculate Safe Electrical Load Capacities

We all have so many motors around the house, so how is one to know what sized circuit to put each of these items on? You see, the circuits are protected by either circuit breakers or fuses that limit the amount of amperage allowed to flow through that circuit. They watch over the circuit’s power draw like a watchdog. But still, how do we determine the right size for these circuit breakers and fuses?

Motors have a nameplate rating that is listed on the side of the motor. It lists the type, serial number, voltage, whether it is AC or DC, the RPM’s, and the amperage rating. If you know the voltage and amperage rating, you can determine the wattage or total capacity needed for the safe operation of the motor.