Do you know how many years old the sockets and wiring are at home? Especially for old houses over 20 years, it must be completely renewed, because the wires and other materials buried in the walls may not meet the requirements or have deteriorated. Besides, in the past, the types of electrical appliances used in the home were not as diverse as they are now. It may be that the original design is insufficient and overloaded, and even open the power distribution box (main switch box) and find that there is only one switch (the electrical power for the household appliances are all on one circuit), or the switch fails to automatically trip, there will be a danger of fire! It is recommended to replace the cables with certification marks in the wall, to replace the switch of the distribution box, to increase the leakage circuit breaker, to add the number of circuits, sockets, etc. according to the demand for electricity. And you must understand the project content when evaluating the quotation. You cannot determine everything based on the price alone.

※ the picture from TPC Fan Page