Why live wire is connect a switch ?
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A switch in the electrical circuit is always connected to the live wire so that the socket/appliance is not live when it is switched off. A fuse is usually a thin piece of wire that will melt and break the circuit if too large a current flows through it.
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Explanation:
The switch must be placed in live wire to maintain the body of appliance at zero potential in the switch off position and if the switch is kept in neutral wire, then the body of the appliance to keep the body at infinite potential in the switch on position
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