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Hi. Black and blue connect to N. Red and yellow connect to Loop. Red connect to L. Green/yellow to separate earth terminal.

This! Adding one or more earth rods to a TN system will have minimal effect on the overall Ze/Zs measurements. For example, say the Ze is 0.20 ohms, and you add one earth rod and achieve an Ra of 20 ohms on the rod (which is in itself not easy to achieve such a 'low' value), the Ze would be...

Hi all. Been a member on here since 2019 though only as a lurker... Anyway thanks to @Tim Howard for reintroducing me to this forum I'm a sole trader based in Coventry, 62 years young with domestic and commercial experience. I was unceremoniously disembowelled over at a different forum...