Being safety minded, I wanted to add RCBO's to some of my house circuits - washing machine, kitchen plugs, exterior plugs, water pump. Our area is standard TNC-S with MEN but my sparky discovered that the house is wired with many shared neutrals so he could not install the RCBO's on three of the four circuits. He said a problem he sees a lot. Next best option was to install a 50A 2P main breaker RCBO which I had waiting for another project - but to do this he said he needed to remove the incoming neutral from the ground. OK I said not really understanding the reason why, he just said to avoid nuisance trips. All was good after circuit testing but now tonight I have three LED lamps that don't shut off completely, it's like they are on a very low dim. Your expert guidance needed please ????????