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Erm.... by checking the resistance? Got to be better than what was in there! (see image) Measuring Earth electrode resistance RA Using a proprietary earth electrode test instrument the Earth electrode resistance test is conducted as follows. In preparation for the test the installation...

Ok guys, thanks for the replies. Can I check some way if the voltage is coming in with my supply? I'll change the earth rod asap. 

Cut a long story short I replaced a weeping tee piece in the cold water pipe at the weekend and as I tidying up got a tingle from the copper pipework when touching the damp concrete. Measured the voltage (potential difference to earth (the damp patch)) at it was circa 9v DC  Switched off each...

Curious home owner. 😁

Hi guys 'n gals, new to the forum here.  Be gentle with me. ☺️ Don't know my way around the site so bare with me.