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2018UNE-HD 60364-5-54:2015/A11:2018 Low-voltage electrical installations - Part 5-54: Selection and erection of electrical equipment - Earthing arrangements and protective conductors
2015UNE-HD 60364-5-54:2015 Low-voltage electrical installations - Part 5-54: Selection and erection of electrical equipment - Earthing arrangements and protective conductors