Firstly i'll point out that i'm the property owner and the installer of the majority of the electrical fittings in the building, including Main & E7 DB's.
now the history lesson... sorry, but it is relevant
property is 230 years old, I have owned it for 42 years. it was semi derelict at purchase, and i completed most of the rebuild including plumbing & electrics. (i'm not formally qualified in either trade)
building was wired to the existing standards (1978) at the time. and i opted to include E7 as the means of heating.
The system was checked and signed off by a qualified engineer, and the 'electricity board' engineer when meter was fitted.
The E7 DB connected to 6 individual points and 6 heaters of varying capacity were fitted. and the system worked well and reliably.
10 years after installation, i opted for a different heating system and the ESH's were removed, and that side of the system became redundant, though DB and points remained.
approximately 3 years ago the meter was changed, and, as far as i was aware, everything worked ok.
had the odd rcd trip over the years, don't you just love rogue tripping!, on 2 occasions traced to slugs in sockets in the conservatory would you believe... also damp in a JB .... apart from that no probs.
a month ago She Who Must Be Obeyed, decreed that we should have an ESH in the living room and another in the dining room (we won't go into the why's and wherefores right now, i'm just the labourer round here )
so.... ordered 2 nice dual input ESH's (Newlec, but Dimplex by another name), and duly fitted them....
i noted that they required a second (peak) supply into a fused DP point, so put them in as well.
connected the whole shebang up, all seemed great, until the next morning when i noted the rcd had tripped overnight., as E7 was still live, i isolated both ESH's and reset the trip, fine , stayed set ok.
switch on either ESH and the rcd trips.
well, seems i've cocked something up, so, check and recheck all ESH connections... all done by the book, and no obvious errors.
next i make up a cable to connect NSH direct to 24hr supply ..... works fine, no tripping, left for 2 hours for heater to warm up... all ok.
ok, the E7 DB is forty years old and running on 20a cartridge fuses and 60a mcb, (none of which are tripping by the way), so i fit a nice new DB with 100a mcb and 6 20a mcb's ... it would have had to be changed sooner or later anyway.
and we still have the rcd tripping! ....
nothing else, just the main rcd, and if the mcb's for each ESH are isolated then all is ok... and that is just removing live from the circuit, so what can be causing the problem? .... the only thing that has changed from when the old ESH's were removed to when the new ones were installed is the METER ...
going to need some help here guys....
now the history lesson... sorry, but it is relevant
property is 230 years old, I have owned it for 42 years. it was semi derelict at purchase, and i completed most of the rebuild including plumbing & electrics. (i'm not formally qualified in either trade)
building was wired to the existing standards (1978) at the time. and i opted to include E7 as the means of heating.
The system was checked and signed off by a qualified engineer, and the 'electricity board' engineer when meter was fitted.
The E7 DB connected to 6 individual points and 6 heaters of varying capacity were fitted. and the system worked well and reliably.
10 years after installation, i opted for a different heating system and the ESH's were removed, and that side of the system became redundant, though DB and points remained.
approximately 3 years ago the meter was changed, and, as far as i was aware, everything worked ok.
had the odd rcd trip over the years, don't you just love rogue tripping!, on 2 occasions traced to slugs in sockets in the conservatory would you believe... also damp in a JB .... apart from that no probs.
a month ago She Who Must Be Obeyed, decreed that we should have an ESH in the living room and another in the dining room (we won't go into the why's and wherefores right now, i'm just the labourer round here )
so.... ordered 2 nice dual input ESH's (Newlec, but Dimplex by another name), and duly fitted them....
i noted that they required a second (peak) supply into a fused DP point, so put them in as well.
connected the whole shebang up, all seemed great, until the next morning when i noted the rcd had tripped overnight., as E7 was still live, i isolated both ESH's and reset the trip, fine , stayed set ok.
switch on either ESH and the rcd trips.
well, seems i've cocked something up, so, check and recheck all ESH connections... all done by the book, and no obvious errors.
next i make up a cable to connect NSH direct to 24hr supply ..... works fine, no tripping, left for 2 hours for heater to warm up... all ok.
ok, the E7 DB is forty years old and running on 20a cartridge fuses and 60a mcb, (none of which are tripping by the way), so i fit a nice new DB with 100a mcb and 6 20a mcb's ... it would have had to be changed sooner or later anyway.
and we still have the rcd tripping! ....
nothing else, just the main rcd, and if the mcb's for each ESH are isolated then all is ok... and that is just removing live from the circuit, so what can be causing the problem? .... the only thing that has changed from when the old ESH's were removed to when the new ones were installed is the METER ...
going to need some help here guys....
