Our home is located in India. We have an individual circuit breakers for all the 7 rooms in our home. And wrapping them whole is the main breaker. Earlier there used to be short circuit in certain rooms due to water leakage. When short-circuit occurred, everything thing else worked if turned of the individual breaker corresponding to that branch where short-circuit originated. But now we have a different problem.
Even after switching off all the individual circuit breakers corresponding to each branch, the main breaker is getting tripped. Electrician told us that it was due to ground-fault. He opened up a few switch boxes and found out that termite had eaten some portions of the wire, which resulted in neutral wire coming in contact with the ground wire. They identified 3-4 switch boxes and we completely rewired it. Even ceiling fans were given extra rubber bushes at the support. But after a week since they left, the issue is persisting. Earlier, where the ground-fault problem was identified, the main breaker used to never turn on even when the individual circuit breakers were turned off. Now, the same issue persists but now we get 1-2 hours of electricity before the main breaker trips.
One another observation I have made in the current scenario is that, if I try to switch on the main breaker right after it got turned off with all the circuit breaks in off mode, it will get tripped right away. But if I do it after 10-15 minutes, it stay on for another 1-2 hours. And in the night, if we are lucky, we get 5-6 hours gap before it gets tripped!
I would be glad if somebody can help to put possible reasons why this is occurring. We had already brought in electrician 3 times already!
Edit: I turned all the knobs to phase 2 and it is working okay for the past one week. What could be the possible reason that it doesn't work in Phase 1 and 3?
Here is quick picture of our electricity distribution panel with the individual circuit breaker and main breaker: