I seem to remember appendix 15 showed you could take a spur from the consumer unit direct, but the unwritten rule is no more than three wires in a terminal, and this is where I see the problem, two 32 amp radials in a RCBO means two wires in each terminal, but two 32 amp ring finals means four wires in each terminal which may result in one wire not being clamped well enough.
Using terminal blocks with link bars would allow one wire for each terminal. However if doubling up due to din rail length this is not going to help.
The problem with an EICR is you know in 10 years, may be less, it is going to be done again, so if you allow some thing untoward it is going to be picked up. I have not seen a claim going back 10 years, but I have seen on change of ownership court case claiming the previous inspector had not reported faults. (The case was brought by Pembrokeshire County Council Trading Standards and heard by Judge Huw Rees at Merthyr Tydfil Crown Court on Monday 20th September 2021) it seems the electrician admitted he did not do a good EICR so really no option but find guilty.
However not sure what would be the result if one reports the faults, but classes them as code C3?
I remember my son telling me how his bosses wanted a failure with every EICR as then they could say, it failed so no point continuing with the inspection. Yes I know this is wrong, the idea is the person commissioning the report can use it to decide the next step, so need to know all required to bring up to standard, however to do 4 EICR's a day, plus travelling, one has to cut corners, he got out as quick as he could.
So we have the big question, if I do XYZ could in the future a claim be made costing custom or money? We all cut corners from time to time, we hope they do not come back to bite us. A device one inch within the zone limits in a bathroom for example is unlikely to cause a danger, but if some pedantic inspector says it needs moving resulting in re-tiling job, it can become expensive.
Remember the EICR inspector is not worried about how much to correct the error, however he should not be looking for non compliance, but for potential dangerous or worse.
Potential dangerous of doing what? Harm personal, or harm equipment? or both of course. It seems we are lawyers looking at use of English language, rather than electricians, if there is a potential danger of a voltage spike taking out a £1000 worth of equipment, unless fitted with a SPD is that a potential danger when doing an EICR?
I watched a long winded video where some were saying lack of SPD in a commercial premises was a code C2.
So two ring finals on one RCBO is OK as long as done in a way so no more than three wires in a terminal. Which in turn depends on how much room inside the CU, and if the manufacturer allows the use of what ever you use to join cables within the CU.
