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What's your Ze? What's the R1+R2? Three lead/no trip tests often give higher results due to a lower test current. There's also RCD uplift to take into consideration. It is acceptable to add your measured R1+R2 to your measured Ze for your Zs. But you could always carry out the alternative Zs...

The 5%/3% is from the source of supply, as Fleeting has pointed out a good number to aim at for a submain is 2% but this isn't set in stone.

That might not be possible if the lighting circuits have a shared neutral. What that means is there's a neutral cable that's common to both lighting circuits and will cause tripping issues if on two separate RCBOs. If the circuit trips out when a lamp blows then I would look at upgrading the...

As long as it contains the basic information shown in the model forms of BS7671 then it is acceptable.

That needs sorting immediately. The polarity looks correct looking at the cables within the board so I would suspect reverse polarity coming in from the meter, that needs looking at. The CPCs (earths) chopped off is worrying...

Morris wiring was never brilliant, Joseph Lucas is often referred to as the Lord of Darkness... On a serious note it may need stripping down and the coils looking at.

My mother in law commissioned and reort through their letting agent for a flat they own in Chelsea. Came back with a few C2's, FI's and the usual C3's. High Zs on some circuits yet R1+R2 and Ze are good. Low IR on some circuits from a global test  but they couldn't gt in to isolate the boiler...

Unless they're growing something in the summer house I doubt it will be hitting 20 amps. Is there any eletric heating? Kettle? Fridge?

I would be seekig advice from the manufacurer. Some state 300mm and/or 150mm away from walls, light fittings etc. Edges like that aren't mentioned in the installation instructions.

Not unreasonable to ask for clarification. Seen it so many times on remedials and I now quote additional time to locate the problem if things are not clear. When I complete an EICR I even attach pictures if required for clarification. And why has he put RFC test results in for the cooker radial...

Do you want me to answer that??? 🤣

On a TN system I always use the max Zs for the MCBs rather than the RCD/RCBO as this should easily be achieved on the vast majority of TN systems. The only time I use the RCD max is for TT systems. I would comment, though not necessarily code, that the whole installation could be affected if...

There has been some minor shortages and delays in getting parts and materials however I haven't had to wait more than a week for some parts, the vast majority are available same day.

Yet another regulation that can be read both ways and is ambiguous. TBH I just use fire clips anyway as they help support the cable and trunking when the glue eventually gives up and it peels away from the wall.

So the customer has a potentially dangerous installation but isn't willing to fix it?

That response does read more as a threat. You have had an EICR completed, this is the legal requirement. It does not have to be satisfactory.  Within 28 days the faults identified need to be rectified and paperwork raised accordingly. You do not need a satisfactory EICR, just evidence that...

I'm going to stick my neck out and say 4.18 doesn't even apply in this situation, depending upon the earthing arrangements for the installation. They more than likely mean RCDs with 30mA for additional protection for lighting circuits in a domestic property. This would only normally be coded as...

Did you test through the socket-outlets or the terminations on the back of the socket-outlets?

TBH I would probably look at stripping the barrel off and chucking in a bucket for some electrolysis treatment. I've got an unknown origin .22 that fell into my possession a few years ago, helps me keep my eye in occasionally.

Some of those ties need trimming flush... 🧐😂 I prefer to use Velcro wrap on data cables, makes it easier to change things around and reduces the chance of crushing the conductors.