Why ELCB cannot work if Neutral input of ELCB does not connect to ground?

By Bharat Ribadiya -
Earth leakage circuit breaker (ELCB) is used to detect the earth leakage faults. If phase and neutral both are connected in an ELCB, the current will flow through the phase and that same current will have to return to neutral, so the resultant current is zero. 

 If a ground fault occurs on the load side, current from phase will directly pass through earth and it will not return through the neutral connection. That means one side current is going and another side not returning and hence because of this difference in current ELCB will trip and it will safeguard the other circuits from faulty loads. 

 If the neutral point is not grounded then fault current will be very high and that full fault current will come back through ELCB, and there will be no difference in current. 

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