Why does an RCD knock out when the load is connected to the outlet?
Hello. In the apartment at the entrance there is a difavtomat with a leakage current of 100 mA. After that there is a wiring for lighting and sockets through RCD 1 (boiler), RCD 2 (washing machine) and circuit breakers (everything else). When the load is connected to sockets with an RCD (1 or 2), it knocks out. Both RCDs have a leakage current of 30 mA. I checked all the options for erroneous connections - everything is correctly connected. Disconnected grounding in sockets with RCD - it works. I tried different loads - it works, even when the incandescent lamp is turned on. There is no nail and no short circuit. I ask for advice in order to solve this problem. Thanks in advance.
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Hello! Are you sure there is no leak through the walls to the ground? Then it can operate regardless of the load if, for example, the neutral conductor is damaged. Also, pay attention to whether it is damp in and after the rosettes. And in general, find someone who rings the wiring with a megaohmmeter. If the wiring resistance is normal (the resistance between the conductors is greater than what is needed for the leakage current to flow, and ideally it should be more than 1 MΩ). It's ridiculous - check separately the sockets that are powered through the RCD. Maybe there is carbon deposits or cracks in the base?