In which type of electrical wiring system are Vulcanized Indian Rubber (VIR) or Polyvinyl Chloride (PVC) insulated wires supported on porcelain cleats used as conductors?

Which system of internal wiring operates such that illuminating one light automatically switches off the previous light as a person advances through rooms?

A diagram that shows the actual physical connections and layout of components like lamp-holders, lamps, and two-way switches in an electrical circuit is called a _____.