Question

Why is fuse wire always placed in the live wire?

Answer 1

to avoid short circuit condition as we know fuse wire had low melting point so as high voltage come and temperature rises it get melted and circuit is broken ...your electric appliances will be safe
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Answer 2

The fuse is always connected in the life wire of the circuit because if the fuse is put in the neutral wire then due to excessive flow of current when the fuse burns current stop flowing in the circuit but the appliances remain connected to the higher potential point of the supplied through the live wire now if a person touches the appliances he may get a shock as the person will come in contact with the live wire through the appliances.