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International Standards define a Global Earthing System as an earthing net created interconnecting local Earthing Systems (generally through the shield of MV cables and/or bare buried conductors). In Italy, the regulatory authority for electricity and gas requires distributors to guarantee the electrical continuity of LV neutral conductor. This requirement has led to the standard practice of realizing...
This paper introduces a characterization of a single Grounding System (GS) or a set of interconnected GSs, according to their safety level and defines their condition of “conventionally safe” and “intrinsically safe”. GSs or a set of them are intrinsically safe, if they guarantee safe touch/step voltages permanently permissible for an assigned ground fault value. It is proposed a new definition of...
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