OP
Tidy Max
Sad isn't it, i pop round to an old dears near my house. I heard it was her birthday so rang her up to wish her well and it made her week!
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Discuss Strange in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
its not possible for the light to turn on and off on its own.... With out someone turning it on??
Sounds like completely unrelated problems so I'd be looking for separate faults not one fault that covers both issues.
Is it exactly the same on and off time each day? Does it happen every day, most days or just occasionally? Have you done all the usual circuit tests? Have you tested for crossed neutrals or borrowed live with all the other circuits? Is it a circuit with 2-way wiring and or switches? Was it ever a 2-way system in the past?
Elbows will be more sensitive to elevated voltage and especially so maybe for old people with thinner skin so this doesn't surprise me, in fact it adds credibility to her story for me. I'm not a big fan of the static theory either, static would give one short sharp shock and not a prolonged tingling sensation. It might only take a few milivolts potential difference to be detectable as a tingle.
I know it sounds a bit 'Cockburn' but just for the hell of it I'd run a bonding wire underneath the sink just between the hot and cold tap if they're metallic construction and if it can be done easily and see if it helps. Also continue the wire to the drain/plug fitting as well if that's also metallic. She's detecting a very small potential between two different points, if you can get all points that are within the area of the sink at the same potential there's a chance you might get rid of the problem, if you don't then that only leaves the potential difference being between the bonded objects (taps etc) and the ground path through her feet in which case revisit the bonding wiring and maybe even lift floorboards in front of the sink (if there are floorboards) and check for a nail through a cable along with a bit of dampness perhaps.
Reply to Strange in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net