Why does an RCD work on old outlets in the apartment?
Dear experts. When reconstructing an old apartment for a new kitchen with a stove up to 7.5 kW, we were told from the supplier that we were supposed to install a residual current device because of the new outlet. The electrician who arrived replaced the old guard, installed an RCD in it, and laid a new cable in the kitchen. However, he said that we have a problem - this device is constantly knocking out, because two outlets have an old connection (as I understand the ground and phase). Therefore, another cable is needed, which he also laid. I am not an electrician and I can’t understand how a new cable can make it possible to use this residual current device. Help me please. Explain for the illiterate. Thank you very much in advance.
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Hello! The residual current device is not installed “because of a new outlet”, but to protect people from electric shock and from the occurrence of a fire due to possible leakage of current if the household appliance or electrical cable is damaged. If this protective device is triggered, then there is a leakage of current, to which it reacts. If this device works even when the appliances are turned off, that means the reason is the unsatisfactory condition of the wiring cable - there is a current leak and such a cable must be replaced. The new cable has reliable insulation, through which there is no current leakage and, accordingly, the residual current circuit breaker does not work.