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Echoing Steptoe's post; The correct terminology MUST be used. The Earthing conductor, Earthing Terminal, Earthing arrangement are different things in 2391. In addition, when answering questions about test procedures, about 9 to 11 separate items are applicable. They include things like seeking permission to isolate and, in the case of taking live reads for Zs, verification against the tables of BS7671 for maximum permissible earth loop impedance. My trainer alerted me to another "rule of thumb" of 0.75 to allow for possible future deterioration within the interval between any two inspections. Hope this assists.
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