- Reaction score
- 2,441
Doing one more of the flood of EICR today on a rented property before a tenant change, but ran into a slightly interesting case so would appreciate other people's views.
About 6.5 years ago I partially rewired the small kitchen at this property - and since the main fuseboard was a skeleton wylex cupboard job and a pain to replace, I added a small Garage CU with 80A RCD to supply the 32A MCB for the kitchen ring to comply with RCD requirements (The main fuseboard has a 100ma RCD).
Today during the EICR, the newer RCD tested perfectly using the megger, but the test button is non functional - doesn't seem to have any resistance behind it so I'm guessing has mechanically failed.
The issue then becomes what code this is noted on the EICR.
Common sense may say it's best to change it since it could be a sign of failure. However, it passed the tests with no problem and therefore functions correctly as an RCD.
A previous thread discussed a similar topic 6 years ago and most people agreed this should be a C2.
However, the ESC best practise guide states that C2 codes are for situations that aren't dangerous at the time, but "would become an immediate danger if a fault or other foreseeable event was to occur"
This is a TN-S system, and the circuit in question has a low Zs so the RCD is not required to meet tripping limits for the MCB - it is there for additional protection as required by Regs.
If this was an EICR on an older board the absence of an RCD would be no more than a C3, so it seems slightly overkill to list this as a C2 and therefore grade the whole EICR as "unsatisfactory"
My own view is somewhere around a C2.5 for cases like this, or perhaps a C2 but a "satisfactory" rating, both of which are not options based on the guidelines.
Given that we know exactly 0.05% of people press the test button, whether quarterly or bi-annually, and given that an inspection will occur after 5 years, does the non-functioning test button actually have an outcome on the "electrical safety" of the installation, which is what the EICR is for after all?
I have no idea how frequently the test buttons fail in comparison to the rest of the device, or whether one it is always indicative of a developing fault.
EICR aside, assuming that the RCD should be replaced, the further wrinkle is that it was a LAP branded board, RCD and MCB, which I believe are no longer produced, (At the time the customer wanted to save money so a LAP garage unit was the chepest option.) so replacnig just the RCD would either mean mixing and matching (which is itself usually a C3 in my book) or entirely replacing the unit.
How would other electricians deal with that part, given that it's long past supplier's warranty periods? Bite some of the cost themselves as a goodwill gesture? (Obviously not installing LAP brand goes without saying, but given MK and the current situation who knows which brands will be around in 6 years?
Final note - any one know who made LAP stuff - and whether it is still made under a different brand?
About 6.5 years ago I partially rewired the small kitchen at this property - and since the main fuseboard was a skeleton wylex cupboard job and a pain to replace, I added a small Garage CU with 80A RCD to supply the 32A MCB for the kitchen ring to comply with RCD requirements (The main fuseboard has a 100ma RCD).
Today during the EICR, the newer RCD tested perfectly using the megger, but the test button is non functional - doesn't seem to have any resistance behind it so I'm guessing has mechanically failed.
The issue then becomes what code this is noted on the EICR.
Common sense may say it's best to change it since it could be a sign of failure. However, it passed the tests with no problem and therefore functions correctly as an RCD.
A previous thread discussed a similar topic 6 years ago and most people agreed this should be a C2.
However, the ESC best practise guide states that C2 codes are for situations that aren't dangerous at the time, but "would become an immediate danger if a fault or other foreseeable event was to occur"
This is a TN-S system, and the circuit in question has a low Zs so the RCD is not required to meet tripping limits for the MCB - it is there for additional protection as required by Regs.
If this was an EICR on an older board the absence of an RCD would be no more than a C3, so it seems slightly overkill to list this as a C2 and therefore grade the whole EICR as "unsatisfactory"
My own view is somewhere around a C2.5 for cases like this, or perhaps a C2 but a "satisfactory" rating, both of which are not options based on the guidelines.
Given that we know exactly 0.05% of people press the test button, whether quarterly or bi-annually, and given that an inspection will occur after 5 years, does the non-functioning test button actually have an outcome on the "electrical safety" of the installation, which is what the EICR is for after all?
I have no idea how frequently the test buttons fail in comparison to the rest of the device, or whether one it is always indicative of a developing fault.
EICR aside, assuming that the RCD should be replaced, the further wrinkle is that it was a LAP branded board, RCD and MCB, which I believe are no longer produced, (At the time the customer wanted to save money so a LAP garage unit was the chepest option.) so replacnig just the RCD would either mean mixing and matching (which is itself usually a C3 in my book) or entirely replacing the unit.
How would other electricians deal with that part, given that it's long past supplier's warranty periods? Bite some of the cost themselves as a goodwill gesture? (Obviously not installing LAP brand goes without saying, but given MK and the current situation who knows which brands will be around in 6 years?
Final note - any one know who made LAP stuff - and whether it is still made under a different brand?
