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Panny I asume you are asking about the bathroom supplementry earth bondng which should be the 4mmsq earth cable that is connected to your bathroom pipes and electrical fittings. the reading you should obtain when testing the resistance is as follows: R<50/Ia R= earth resistance Ia=...

This work should be inspected and tested for safety and complience with electrical regulations. A certificate should be completed and building control should be notified. If you you decide to take on the work yourself. You will not be able to test the work for safety. And how do you know...