Why is current rating of a fuse required?

1.	Why is current rating of a fuse required?
Answer» 1) The electric wiring for light and fan circuit uses a thin fuse wire of low current carrying capacity because the line wire has a current carrying capacity of 5A. 2) Thicker fuse wires of higher current carry ing capacity (15 A) are used for large current consuming appliances such as air conditioner, geyser, washing machine, etc. because the line wire for such dev ices have current carrying capacity of 15A. The current rating of a fuse in a circuit can be obtained by the following relation. Current rating of fuse = Total power of appliances in that circuit/ Voltage of the supply

Answer»

1) The electric wiring for light and fan circuit uses a thin fuse wire of low current carrying capacity because the line wire has a current carrying capacity of 5A.

2) Thicker fuse wires of higher current carry ing capacity (15 A) are used for large current consuming appliances such as air conditioner, geyser, washing machine, etc. because the line wire for such dev ices have current carrying capacity of 15A.

The current rating of a fuse in a circuit can be obtained by the following relation.

Current rating of fuse = Total power of appliances in that circuit/ Voltage of the supply

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