Modern switchboards also have measures to prevent electrical shock and overloading a circuit. IDK how useful that would be if the switchboard were under water though. There is also the case that wires themselves will be insulated so not everything would be in contact with water in a worse case scenario. There are actually special safety measures in electrical circuits for areas where outlets may get wet. Such as the bathroom and kitchen. So water is at least partly accounted for in the design of the home electrical system.
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