Smart meter tripping RCD anymore than anecdotal evidence?

Is that referring to a Type G RCD or a Type G SPD, I am assuming it is a RCD but it seems it could be either or both.

I think a G-type RCD is one with a very small deliberate delay - around 10ms - so it still provides additional shock protection (overall it's still within the 300ms at 30mA and 40ms at 150mA limits) but is less sensitive to very short duration residual currents/surges.

https://www.eaton.com/content/dam/eaton/products/electrical-circuit-protection/circuit-breakers/xeffect-rccb/eaton-rcd-application-guide-br019003en-en-us.pdf mentions them.

If the (presumably non-delayed) 300mA device is tripping and but the downstream 30mA ones aren't then that to me points to a large magnitude (>>150mA) but short duration (<40ms) pulse of residual current, where both devices are in their 'may or may not trip' regions.

Modern boilers do normally ignore the gas by a generated spark - galvanically that should be all contained within the boiler but I suppose some strange fault might let the surge escape. If the boiler is close there might possibly be some radio interference (the original radio transmitters were a spark gap with an aerial/earth connection just to help the effect propagate longer distances) but again the original design should have prevented such a problem.

Other thought is the classic DP switch in front of a high resistance N-PE fault - with the switch fully open or fully closed there's little leakage, but if the N opens slightly before L or closed slightly later than L, then there can be a momentary surge of current to PE.

   - Andy,

"Modern boilers do normally ignore the gas by a generated spark".   I like that. 

And in someone else's comment in another recent thread there's "hypnotic" instead of "hypothetical".  

Does this new site have spelling "correction" that I haven't yet been victim of, or at least haven't noticed?  These seem unlikely words to have come by accident, and I don't remember such gems from the earlier site. Or perhaps it's mobile devices doing clever AI-based inference of what's meant. 

And now I remember also a "route 3" versus "root 3" that might have had the same reason.

Inside the modern boiler, as well as the spark ignition is also a micro-controller and a fair amount of delicate sensor electronics to keep the fan speed mass air flow and so forth all on the efficiency knife edge - designs where the ignition was bosky enough to fire an RCD at 40 paces by EMP would almost certainly at the least re-set its own processor if not put itself unequivocally beyond use. I think we can rule that out.

Something like a shared neutral that only comes into circuit when the pump is on and the 3 way valve is in the hot water position might just about sneak in under the net as it were, but I think even that would have already been found during other tests.

Beware of the autoKrikketer and double check your spellings before committing to witchcraft as a career.

Some errors phrase are funnier then others

M.

Inside the modern boiler, as well as the spark ignition is also a micro-controller and a fair amount of delicate sensor electronics to keep the fan speed mass air flow and so forth all on the efficiency knife edge - designs where the ignition was bosky enough to fire an RCD at 40 paces by EMP would almost certainly at the least re-set its own processor if not put itself unequivocally beyond use. I think we can rule that out.

Something like a shared neutral that only comes into circuit when the pump is on and the 3 way valve is in the hot water position might just about sneak in under the net as it were, but I think even that would have already been found during other tests.

Beware of the autoKrikketer and double check your spellings before committing to witchcraft as a career.

Some errors phrase are funnier then others

M.

A cute clemon!