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@rive_gauche
I would suggest that if there has been wholesale alteration to a fixed domestic installation that relied on metallic containment as the earth fault return path, then the metallic containment is possibly not continuous back to the source of supply, and that the possibility for sustained fault potentials at greater than 50VAC is realistic.
I would suggest that a periodic inspection be carried out before any more non-competent alterations carried out.
This should reveal whether the protective earth is continuous, the circuits are properly installed, and the protective devices of the correct type and rating.