hi Paul
yep its TNC-S (pme) and connected in the house as that..

something i forgot to mention which as a long shot.. there is a 2.5 swa going to the stables over 100mtrs away. i have the problem that the cable full of capacitance, something i am waiting for the ECA to come back to me with regard to getting it discharged. never thought about that.. C+H mentioned capacitance in a machine, now would or could this have a bearing on things... ie the path via the bath having the least resistance?? when it discharges.. the cold main enters the house under the bath, solid floor, so effectivley the ground around the pipe would be live, and when the water leaves the bath as you pull the plug you get a small current flowing through you???

Long shot???? thoughts..