| Phase (line) and Neutral both wires connected through RCD. |
| It trips the circuit when there is earth fault current. |
| The amount of current flows through the phase (line) should return through neutral . |
| It detects by RCD. any mismatch between two currents flowing through phase and neutral detect by -RCD and trip the circuit within 30Miliseconed. |
| If a house has an earth system connected to an earth rod and not the main incoming cable, then it must have all circuits protected by an RCD (because u mite not be able to get enough fault current to trip a MCB) |
| RCDs are an extremely effective form of shock protection |
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