किस प्रकार की विद्युत वायरिंग प्रणाली सबसे अधिक यांत्रिक और अग्नि सुरक्षा प्रदान करती है?

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 _____.