Why is an RCD triggered in an electrical panel for no apparent reason?

Vasya asks:
Changed the shield in the house. Based on the future three phases, a 3-phase input 25 A from ABB, on each phase 16A RCD from Hager, then the machines - 16A, 10A, 6A. On one hang sockets of the 1st floor. I turn on the kettle or refrigerator - the UZO of this group is cut down. With data cut down by consumers, the group works. Until I put the 25A machine from the old shield on which all this used to hang, the problem repeated itself in different connection variations. What is the error, the problem?
The answer to the question:
So the RCD or the machine still works? What machine did you connect instead of 25A? 3 options are possible:
1. Malfunction of ouzo / machine.
2. Incorrect wiring, somewhere zero and ground are mixed up, as well as damage to the wiring.
3. Faulty devices themselves.

There is a separate article on this subject:https://our.electricianexp.com/en/pochemu-srabatyvaet-uzo-i-chto-delat-v-etom-sluchae.html

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