faulty electrical wirings. How would you know? MAybe the tenant use an appliances that is not rated to the local standard? Or maybe abused a single socket and plug too many things?

Somebody I think LAkeland mentioned about bare wirings on ceilings, for sure it's not on buildings because everything is inside conduits and even if inside conduits and not visible to eyes, it can still be tested whether a wire was stripped or become bare, there is a test for it. And if it is bare, then it will not function cause the breaker will keep on tripping if two bare wire touch each other.