मानकों के अनुसार, किसी भी विद्युत वायरिंग स्थापना का इंसुलेशन प्रतिरोध (insulation resistance) किससे कम नहीं होना चाहिए?

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 _____.