A comparison of NEMA- and IEC-type devices
The NEC defines a controller in a few different ways. In Art. 100, a controller is described as a device or group of devices that serves to govern, in some predetermined manner, the electric power delivered to the apparatus to which it is connected. Getting a little more specific, a definition in Art. 430.2 states, A controller is any switch or device that is normally used to start and stop a motor
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