My main circuit breaker keeps tripping after on attaching a new load, like an iron or home theatre. Please know this, there exists a main circuit breaker through which are connected 3 more breakers, each one of those 3 breakers is connected to 2 rooms.
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Your circuit breaker is tripping on overload. Pulling too much current thought the main causes the internal bimetallic strip to heat up and trip the unit. After tripping, the internal bimetallic strip is still hot and must cool down before it can reset. (The bimetallic strip in a breaker is similar to the bimetallic strip in a low cost dial thermometer where increasing or decreasing temperature causes the needle to move)
The bigger problem is you have too much load for your panel, so you either need to shed load (reducing consumption is low cost but inconvenient) or install a larger service (high cost - done by an electrician).
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