Doing an EICR earlier and got some wierd readings not experienced before, thankfully property is empty.
I did a Zdb on a TNC-S system and got an earth loop of 0.44 this was with all earths connected at the MET in the DB so I checked the main earthing conductor into the cut out in the outside meter cabinet and all was ok, nice and tight, so I then disconnected the main earthing conductor in the DB and tested the Ze which measured 0.38 still above max.
As I put the main earth back into the MET I got a little bit of arcing , so with test leads I measued between the MET and main earth and got 40V!!!!!!! I also got 39V reading between N & MET.
Going back tomorrow for further investigation, but any ideas out there?
I did a Zdb on a TNC-S system and got an earth loop of 0.44 this was with all earths connected at the MET in the DB so I checked the main earthing conductor into the cut out in the outside meter cabinet and all was ok, nice and tight, so I then disconnected the main earthing conductor in the DB and tested the Ze which measured 0.38 still above max.
As I put the main earth back into the MET I got a little bit of arcing , so with test leads I measued between the MET and main earth and got 40V!!!!!!! I also got 39V reading between N & MET.
Going back tomorrow for further investigation, but any ideas out there?