hi, please help
got a call last friday to an RCD tripping every 30 mins or so for no apparent reason. went to have a look turns out it use to have supply coming in over head but was changed by DNO on thurs to a TNCS, since then its tripped every 30 mins or so (longest time to stay on was 1hour 10 mins). it use to trip every now and then when windy but coz the cable came thru some trees the owner put it down to the tree rubbing sheathing off.
first off changed rcd, thought i had sorted got paid drove off within 30 mins of leaving gets a phone call to say it had tripped again.
next day goes back, big american fridge that seems to start up something (motor) every now and then, un plugs it puts it in to socket which is on non rcd protected side of board. explains it could be that waited bout an hour no trip..and await to hear from them. just as left it trips. goes back asked if theyve done anything, ie boil kettle, switch iron on. "no nothing".
basically removed all circuits on RCD side tested the circuits r1,r2,rn, R1+R2, IR - live to neutral, live to earth, neutral to earth, all reading were fine. checked Ze 0.33, PFC 0.71, PSCC 0.72.
put one circuit in at a time and waited 45mins no trip, removed it and did another circuit.. did this for them all no trip. removed all sockets found the odd minor problem like slight loose connection, fixed all sockets back and circuits back in board. no trip. again waited abit no trip so left. 2hours later gets the dreaded phone call its tripped.
DNO have been back and reted there side and said theres is all perfect.
circuits on the 80a rcd side 3x socket rings 32a and 1x socket radial 20a, dont think its overloading as been fine for last 6 years apart from the odd time when windy. going to check with clamp meter on tuesday.
going back on tuesday anyone have any ideas what it could be?
could it be anything to do with new supply?
seem to have written an assay again but like to give as many details as possible to paint the picture.
cheers wayne
got a call last friday to an RCD tripping every 30 mins or so for no apparent reason. went to have a look turns out it use to have supply coming in over head but was changed by DNO on thurs to a TNCS, since then its tripped every 30 mins or so (longest time to stay on was 1hour 10 mins). it use to trip every now and then when windy but coz the cable came thru some trees the owner put it down to the tree rubbing sheathing off.
first off changed rcd, thought i had sorted got paid drove off within 30 mins of leaving gets a phone call to say it had tripped again.
next day goes back, big american fridge that seems to start up something (motor) every now and then, un plugs it puts it in to socket which is on non rcd protected side of board. explains it could be that waited bout an hour no trip..and await to hear from them. just as left it trips. goes back asked if theyve done anything, ie boil kettle, switch iron on. "no nothing".
basically removed all circuits on RCD side tested the circuits r1,r2,rn, R1+R2, IR - live to neutral, live to earth, neutral to earth, all reading were fine. checked Ze 0.33, PFC 0.71, PSCC 0.72.
put one circuit in at a time and waited 45mins no trip, removed it and did another circuit.. did this for them all no trip. removed all sockets found the odd minor problem like slight loose connection, fixed all sockets back and circuits back in board. no trip. again waited abit no trip so left. 2hours later gets the dreaded phone call its tripped.
DNO have been back and reted there side and said theres is all perfect.
circuits on the 80a rcd side 3x socket rings 32a and 1x socket radial 20a, dont think its overloading as been fine for last 6 years apart from the odd time when windy. going to check with clamp meter on tuesday.
going back on tuesday anyone have any ideas what it could be?
could it be anything to do with new supply?
seem to have written an assay again but like to give as many details as possible to paint the picture.
cheers wayne