- Reaction score
- 3,010
I think the state the shower cable had been left in - particularly at its far end - could allow N-cpc or N to 'earth/terra-firma' currents to flow depending on the potential of the N with respect to cpc or earth/t-f.
There might also be some interaction between the redundant shower cable and the lower IR reading socket circuits through the fabric of the building especially if dampness is present.
As Murdoch might have said - 'did you clamp and measure earth leakage currents before and after the changes you made'? Or ramp test the RCD before and after?
I'd also take gander and do some IR measurements on those appliances which are plugged in which could suffer earth leakage even when switched off by the functional controls eg: kettles, ovens, immersion heaters, central heating, ...or in combination accumulate a high earth leakage current.
I'd want a bit more investigation done on the low IR socket circuits. What voltage did you do the IR tests?
Thanks for the response,
I have ramp tested the RCD before and after results were mid 20's mA (Can't remember exactly) and also clamp tested the main earth which didn't show any leakage however at that exact time the RCD was not tripping.
Did the IR first at 250 and as it was low did it again with everything unplugged at 500 where I got the 2-3 MOhms readings.