Stabilization of voltage in an apartment building
Hello, I am the chairman of an apartment building, a one-entry house with 180 apartments. Last month, an accident occurred in the house, namely, due to power surges, many small and large household appliances burned out. The reason was found out, according to the conclusion of the electrician, this is the lack of a working zero, which jumped to the ground due to the fact that during the construction of the grief electricians forgot to put a jumper. For 5 years, the earth worked as a working zero, but at a fine moment it could not stand it due to power surges, the surges were recorded up to 280V at the entrance to the house, and the drops were up to 210V. The management company proposed to install a voltage relay on each riser, which implies high costs, and in the event of a power surge there will be short-term power outages.
Question:Is there any equipment that can be installed on the input to the house to stabilize the voltage? The so-called voltage stabilizers, as a separate unit for an apartment, are only interested in the whole house, and is there such a practice at all?