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All equipotentials are connected to the ground of the building, so the first floor must be connected to the top floor, and if not, it must be a false grounding made by the construction party.
If the connection is correct, the potential is equal in the case of moisture.
Do not link the socket to the equipotential junction box. As long as it is reliably grounded, it will do.
Local equipotential is not required to be connected to the down lead, but must be connected to the total equipotential. >>>More
The ground wire of the socket in the bathroom should be connected to the local equipotential terminal, which is mainly used for lightning protection, followed by preventing leakage. >>>More
The flue is definitely not good, the following ones are used for ventilation, the water is okay, it belongs to the sky pipe, it is breathable, but it is not blocked.