There are six basic types of Motor Control Circuits addressed by the NEC.  Each type has overcurrent protection rules, and in some cases, each has only ground fault and short circuit protection rules.

The six types of motor control circuits are:

1. Control Circuits tapped from the Motor Short Circuit and Ground Fault Protective Device that do not exit the Motor Controller.

2. Control Circuits tapped from the Motor Short Circuit and Ground Fault Protective Device that exit the Motor Controller.

3. Control Circuits that are supplied by a transformer that have primary power supplied by a tap from the Motor Short Circuit and Ground Fault Protective     Device that are not Class 1, Class 2, or Class 3 circuits as defined in Article 725 and that do not exit the Motor Controller.

4. Control Circuits that are supplied by a transformer that have primary power supplied by a tap from the Motor Short Circuit and Ground Fault Protective     Device that are not Class 1, Class 2, or Class 3 circuits as defined in Article 725 and that exit the Motor Controller.

5. Control Circuits that are supplied by a transformer that have primary power supplied by a tap from the Motor Short Circuit and Ground Fault Protective Device that are Class 1, Class 2, or Class 3 circuits as defined in Article 725.

6. Control Circuits that are externally derived from a Class 1, Class 2, or Class 3 power supply.