Question

The diagram shows wiring in a meter room of a building.

1. What is the current rating of device X?
2. What is the difference between the switch Z shown in the diagram and the switches you use to operate different appliances at home?
3. What is the unit of the physical quantity displayed in Y?

Answer 1

1. Current rating of device X = 50A
2. A double-pole switch is Switch Z. There is an iron coating on this switch, and it is worn. This single-pole switch, which is used to control appliances, doesn't need to be earthed.
3. The unit of physical quantity shown in Y is