(a) Why are fuses fitted in the fuse box of a domestic electricity supply ?

(b) What device could be used in place of the fuses ?

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Solution

(a) Fuses are fitted in the fuse box of a domestic electricity supply to protect the whole wiring of the house when excessive current flows in the circuit.
(b) MCB. It is a device for automatically interrupting an electric circuit to prevent excessive current, as that caused by a short circuit,from damaging the apparatus in the circuit or from causing a fire.

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