If you have flickering lights, dimmed lights, odour of burned from switches or sockets, sparks from sockets or switches, buzzing or humming sounds from appliances, hot cables or melted on the connection, MCB or RCD tripping for no obvious reason, and a bunch of faults not listed in here might occur , usually people know when something is wrong with the electricity as things do not operate the way they did before you do not have to be expert to know when something is wrong.

Fault-finding is rather difficult process that takes a while in order to find the fault, electricians can not say at a glance of the installation what is wrong. It is a process of elimination same as doctors, we run tests and exclude different options until we find the fault or narrow it down to 1-2 options and then fix it.

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