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I agree with you, you should record the protective device and additional protection provided for the entire final circuit. Otherwise you create the impression that the circuit has additional protection that doesn't exist.

I used to think that DP RCBOs were more essential than they in fact are. Detection is the same. A L-E fault is isolated. An N-E fault that isn't isolate by a SP RCBO will on many installations just be duplicating a TN link in the head. (There are exceptions of course!) I'm more recently thinking...

That's what I thought you might have meant, hence my comment about cross purposes!

It's quite easy to talk at cross purposes here. The point about RCBO boards is the N's are joined upstream of the RCBO test coils that look for the imbalance. Whether SP or SP with switched N this doesn't change. That said, SPSN (DP) RCBOs are much more convenient for testing and fault finding...

That is all true. What I was trying say is that If the valve fails to open one day, the NO would still become live and the boiler would fire trying to pump against a closed valve. My suggestion is below. My understanding of the sequence is: 1 - remote radio stat calls for heat, activating...

Could be - faulty rcd - something plugged into a socket with earth faults. You should definitely try unplugging things, especially any heaters - faulty light fitting -outside light on same circuit full of water Any real electrician could test each circuit and measure the Earth leakage. Some...

No, not on this one.

If you have the probe with test button, not too bad. But I know what you mean. Megger has had hands free continuity tests going back to the BM series and once you’ve used it you want it! If I was starting out I’d get a 15xx, they are bullet proof, batteries last forever, and they are easy to use.

There is one improvement, you don’t want the boiler to fire unless the UFH zone valve opens. So I’d use the orange from the zone valve to feed Common on the heat enable relay That way if the valve doesn’t open, the boiler won’t fire up.

Another local sparks who I'm good friends with asked me to look at this one with him. He'd gone there to try and solve nuisance tripping. Based on testing he reckoned the car port electrics were a big factor (I could certainly see why) and he replaced some accessories with decent IP rated...

That looks spot on. (If it's the only heating system you may not have a zone valve for the under floor heating)

That's a really funny coincidence, I did one of these at a school on Saturday....with 4 wireless stats. So the way these work is that the heat enable is just a relay. In my case.... The under floor heating pump was a simple 3 wire connection to the controller. I had a four core flex going to...

Nothing wrong with them. If you are buying one 2nd hand, I'd suggest you find one with 12 months calibration on it from a seller that accepts returns.

The issue was the manufacturers spade connector onto the terminal, it had hardly any grip. The screw terminal was tight, and while it could have been prepared better it wasn’t causing any problems.

This one didn't take long. The spade connector was seriously loose. As a lover of interesting cheeses, I had to contain my indignation that this smell was likened to cheese....

Aside from giving it time, there is only one more thing you can do; see if there is a cooker isolator switch in the kitchen on the wall or in a cupboard. Turn it off. Check the cooker circuit will turn on at the consumer unit and not trip the RCD. That is the best you can do without special...

@Stephen Munt there are also a few software options for generating certificates. The most practical software for your situation is probably Electraform as you can purchase a few credits at very low cost and then it doesn't matter if it takes you a month or years to use them.

Another job I like is sorting out broken under floor heating control systems. In my area other sparks seem to run a mile from these jobs.

Unfortunately things have this habit of evolving... I sometimes wonder what would happen if the completion certificate (equivalent to EIC) from the 14th edition came back. I suspect many people would certify work as it would barely take any time to do. The danger is things would get certified...

Really you want a cheap dual channel monitor as advised above. They can be had for under £30. Most require putting in a suitable box and need a power supply providing and then have two CT clamps, which can be used for import and export.