In cases of a capacitor connected to the load side of motor overload devices, the rating or setting of the motor overload device shall be based on what?

When determining the rating or setting of a motor overload device in cases where a capacitor is connected to the load side, the correct basis is the improved power factor of the motor circuit. The presence of capacitors in an electrical system affects the overall power factor by reducing the phase difference between voltage and current. This improvement in power factor can lead to a reduction in the apparent current drawn by the motor.

As the power factor improves, the current flowing through the motor and the overload protection device may decrease, which is why the overload setting should be adjusted accordingly. By basing the overload device’s setting on the improved power factor, it ensures proper operation and protection of the motor under the new conditions created by the capacitors.