In my opinion, there are four key definitions in Article 100 that interlock into a whole, with respect to your question, George.
- Premises Wiring (System) - branch circuit in the walls
- Controller - light switch
- Utilization Equipment - flood light
We are told that the current path internal to a controller is not part of the Premises Wiring
. Current has to be taken from the Premises Wiring
for it to flow in the Controller.
When the controller allows an equipment (flood light) to utilize energy, the current for the utilization equipment must be taken from the premises wiring system, routed through the controller, returned to the premises wiring system and be taken again at the flood light.
In my opinion, a light switch is installed at an outlet.