QQuestion
The diagram shows wiring in a meter room of a building.
(a) What is the current rating of device X?
(b) What is the difference between switch Z shown in the diagram and the switches used to operate different appliances at home?
(c) What is the unit of the physical quantity displayed in Y?
✓Answer
(a) X is a company fuse or pole fuse. It does not have a fixed current rating; its rating depends on the load capacity of the connection.
(b) Z connects and disconnects the live and neutral lines simultaneously, whereas a switch used for a domestic appliance connects and disconnects only the live line.
(c) The unit is kWh.
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