Legrand CU with one RCD (80Amp – 30mA) covering 3 groups of sockets , plus garage and shower room so 5 mcbs in total . Tripping of RCD is sort of random ..in that most commonly occurring once between 4 a.m and 6 a.m. ..sometimes twice (i.e. again typically an hour or so after a manual reset..but no real pattern to a second trip if there is one..except it's not within minutes...even 30 minutes).
None of the 5 mcbs trip when the RCD does. To reset the RCD I have to manually switch off all 5 mcbs before the RCD will "hold". It resets ok and typically the fault does not recur until perhaps early the next morning (next day that is).
I have removed all but one portable extension boards that have surge protection...throughout the house...and certainly in mcb zone 2 which covers the "office" and TV room. That doesn't appear to make any difference. Ditto running my PC direct from mains socket as opposed to via a UPS.
However, after months of trial and error I am fairly sure the problem lies with my (2012 Packard Bell iMedia S1800) PC. Quite simply the tripping has so far only ever occurred when it is left on overnight. When I make a point of shutting it down before going to bed it has never happened. When visitors used the house for a week while we were away I switched off the PC & pulled the plug(S)..closing off the office where it sits..there were no trips that whole week. The RCD rarely trips during the day...but has done ..some 3 or 4 times over the last 6 months.
Could a single PC be the culprit ( I think it is) and if so is it most likely to be a dodgy connection to the PSU? Is there any test I can do on the PC apart from a visual inspection while unplugged.
If the PC is left running overnight (downloading iPlayer programmes usually on a slow rural 1 meg-internet profile) then there is a good chance the RCD will trip once in the small hours. Of course I can ensure the PC is switched off every night..and from my experience so far that stops the tripping. However, I 'd really like to be able to download stuff at night without having to get up to reset the RCD once or even twice.
EDIT - forgot to say I have used 3 or 4 different leads & checked the plugs on each..plus used different sockets to feed the PC..albeit only using extension leads from sockets in the same mcb zone.
Any thoughts?
Thanks for reading.
None of the 5 mcbs trip when the RCD does. To reset the RCD I have to manually switch off all 5 mcbs before the RCD will "hold". It resets ok and typically the fault does not recur until perhaps early the next morning (next day that is).
I have removed all but one portable extension boards that have surge protection...throughout the house...and certainly in mcb zone 2 which covers the "office" and TV room. That doesn't appear to make any difference. Ditto running my PC direct from mains socket as opposed to via a UPS.
However, after months of trial and error I am fairly sure the problem lies with my (2012 Packard Bell iMedia S1800) PC. Quite simply the tripping has so far only ever occurred when it is left on overnight. When I make a point of shutting it down before going to bed it has never happened. When visitors used the house for a week while we were away I switched off the PC & pulled the plug(S)..closing off the office where it sits..there were no trips that whole week. The RCD rarely trips during the day...but has done ..some 3 or 4 times over the last 6 months.
Could a single PC be the culprit ( I think it is) and if so is it most likely to be a dodgy connection to the PSU? Is there any test I can do on the PC apart from a visual inspection while unplugged.
If the PC is left running overnight (downloading iPlayer programmes usually on a slow rural 1 meg-internet profile) then there is a good chance the RCD will trip once in the small hours. Of course I can ensure the PC is switched off every night..and from my experience so far that stops the tripping. However, I 'd really like to be able to download stuff at night without having to get up to reset the RCD once or even twice.
EDIT - forgot to say I have used 3 or 4 different leads & checked the plugs on each..plus used different sockets to feed the PC..albeit only using extension leads from sockets in the same mcb zone.
Any thoughts?
Thanks for reading.
