Live wire brings the current, neutral completes the circuit back to the substation, and earth is our safety shield, connected to the ground. During a short, huge current flows, heats the fuse wire, and melts it, breaking the circuit. But I tell you, most faults I see are because people use a thin earth wire or connect it poorly—bhal lagise na. Just yesterday, a new apartment had all earths tied to a rusted water pipe. That's asking for trouble. My flask of cha stays safe only because the connections are correct.
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