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Discuss Identification of incomer in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
It looks like a very old TN-S supply, is there a lead sheathed cable entering the bottom enclosure ? can you not islolate the installation and do a Ze test on the cast iron enclosure, even if its a good reading the DNO should be asked to upgrade the earth connection to the service cable
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