Smart meter tripping RCD anymore than anecdotal evidence?

I have replaced the consumer unit with a new Fusebox consumer unit with double pole 30 mA type A RCBOs testing as I did the work.

On the kitchen ring someone had disconnected a spur leaving conductors taped up in a back box , unfortunately they disconnected the wrong neutral breaking the neutral ring and leaving the disconnected neutral live with the other end that is not visible possibly being an earth fault, a fault I have fixed, but not the fault causing the RCD to trip.

The house socket ring was iffy, but had an insulation test result of over 0.7 Mega ohms so as time was running out I connected it, as I suspected it would it tripped several times over night so I went back yesterday to strip the circuit.

So I returned and disconnected the circuit having unplugged all the appliances, neutral to earth insulation test result  400 Kilo ohms, great something to look for.

Broke the ring by removing a socket to start faulting by halves, fault in back half of house. Break ring again having identified sockets with issues using socket test lead adapter, take socket out test the cables no fault.

Test all circuit conductors of the ring that is now broke into three sections at both ends, six tests and no fault.

Logic dictates I have clear the fault by removing the sockets to test, so have a look at the insulation on the wiring in the socket back boxes and run my fingers over them, all okay so insulation test the actual socket fittings. 

Possibility repeated insulation testing has dried out a damp fitting, so dismantle the outdoor socket which looks okay. 

Reassemble the circuit, replacing one of the internal sockets and the external socket as well as opening up the drain hole in its enclosure and sealing the enclosure with silicone.

Retest at the consumer unit, confirming end to end continuity of conductors, then live to neutral insulation test and live + neutral combined to earth with a test result of 1.8 Giga ohms, so reconnected and came home.

The RCBO is still tripping and I have to go and try again, I want to say it is something that is plugged in possibly an extension lead with a SPD in it, but I did get a low insulation test result which then cleared whilst I was stripping the circuit.

Around thirty seven years ago in the mid 80's before I qualified as an electrician I was working as a carpenter on piecework on a new housing site with an electrician called Desi who taught me a lot about electrical work. One evening as I was about to go home Desi asked me to take my generator and circular saw to cut the chipboard floor up in a house, because there was an insulation fault on a circuit he needed to find. So I cut full sheets out, running the saw though the togues on the sheets of flooring chipboard, so we had big holes in the floor. Suddenly the meter showed a perfect test result, off the top of the scale on the meter, so we checked where every nail had been driven through the sheets to see if a cable had been nailed and all the visible cables, everything was perfect.

Desi said we might as well give up as with a perfect (off the top of the scale) test result we had absolutely no idea where to look, however back then there was no RCD protection at the consumer unit, only an RCD socket in a garage if there was a garage, so neutral faults would not be an obvious issue when the circuit was in use anyway.

So it looks like I am stripping and testing again, at least with the new consumer unit they can turn the socket circuit off when they go out and know the freezers, fridge and central heating are all working okay.

I have replaced the consumer unit with a new Fusebox consumer unit with double pole 30 mA type A RCBOs testing as I did the work.

On the kitchen ring someone had disconnected a spur leaving conductors taped up in a back box , unfortunately they disconnected the wrong neutral breaking the neutral ring and leaving the disconnected neutral live with the other end that is not visible possibly being an earth fault, a fault I have fixed, but not the fault causing the RCD to trip.

The house socket ring was iffy, but had an insulation test result of over 0.7 Mega ohms so as time was running out I connected it, as I suspected it would it tripped several times over night so I went back yesterday to strip the circuit.

So I returned and disconnected the circuit having unplugged all the appliances, neutral to earth insulation test result  400 Kilo ohms, great something to look for.

Broke the ring by removing a socket to start faulting by halves, fault in back half of house. Break ring again having identified sockets with issues using socket test lead adapter, take socket out test the cables no fault.

Test all circuit conductors of the ring that is now broke into three sections at both ends, six tests and no fault.

Logic dictates I have clear the fault by removing the sockets to test, so have a look at the insulation on the wiring in the socket back boxes and run my fingers over them, all okay so insulation test the actual socket fittings. 

Possibility repeated insulation testing has dried out a damp fitting, so dismantle the outdoor socket which looks okay. 

Reassemble the circuit, replacing one of the internal sockets and the external socket as well as opening up the drain hole in its enclosure and sealing the enclosure with silicone.

Retest at the consumer unit, confirming end to end continuity of conductors, then live to neutral insulation test and live + neutral combined to earth with a test result of 1.8 Giga ohms, so reconnected and came home.

The RCBO is still tripping and I have to go and try again, I want to say it is something that is plugged in possibly an extension lead with a SPD in it, but I did get a low insulation test result which then cleared whilst I was stripping the circuit.

Around thirty seven years ago in the mid 80's before I qualified as an electrician I was working as a carpenter on piecework on a new housing site with an electrician called Desi who taught me a lot about electrical work. One evening as I was about to go home Desi asked me to take my generator and circular saw to cut the chipboard floor up in a house, because there was an insulation fault on a circuit he needed to find. So I cut full sheets out, running the saw though the togues on the sheets of flooring chipboard, so we had big holes in the floor. Suddenly the meter showed a perfect test result, off the top of the scale on the meter, so we checked where every nail had been driven through the sheets to see if a cable had been nailed and all the visible cables, everything was perfect.

Desi said we might as well give up as with a perfect (off the top of the scale) test result we had absolutely no idea where to look, however back then there was no RCD protection at the consumer unit, only an RCD socket in a garage if there was a garage, so neutral faults would not be an obvious issue when the circuit was in use anyway.

So it looks like I am stripping and testing again, at least with the new consumer unit they can turn the socket circuit off when they go out and know the freezers, fridge and central heating are all working okay.