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RCDs fail. RCDs don't protect against heat build up in bad joints. RCDs don't detect an incorrectly rated fuse in the plug.

What's good about it? It's only 7mm thick and should be better than 12mm of PIR. It isn't going to be nearly as good as 100mm of PIR, but that's not an option for the OP. My point is, that everything is a compromise. If you want effective insulation, under 12mm and cheap, it isn't going...

Why? It's so much easier if you do things in the right order. 1. First fix electrics 2. Plastering 3. Second fix electrics

Good underfloor heating installations have good insulation in the floor. Usually, that means something considerably thicker than you are considering (100mm of insulation is not unusual). To get a similar performance in a thickness of less than 20mm is going to be expensive. For example this...

Would you be so kind as to give a clear, consistent and logical answer to my question then? Are cables ancillary? If so, why are they explicitly mentioned in 1 (b) and 3 (a)? If not, why are they absent from 2 (c)? Just to be clear, by ancillary I mean that they are implicitly...

Are cables ancillary? If so, why are they explicitly mentioned in 1 (b) and 3 (a)? If not, why are they absent from 2 (c)? Any interpretation is inconsistent or illogical and that's why I think it's poorly drafted. Nothing to do with my desires.

We're getting some mammoth posts, so here's a short one. If an electrician was going to install some mains powered interlinked smoke alarms from a fused spur, how do you think they would describe the work on a quote/EIC/etc? "Installing mains powered interlinked smoke alarms" or...

As you say, safe, but possible not compliant. If, hypothetically, I was designing such an installation, I'd go for an IP rated luminaire, just to cover myself.

You make some interesting points Paul_C. I'm sorry I don't have time to address them all in detail. It's also been bugging me why it's "lighting points or sockets and fused spurs". I think the intention was to limit fused spurs to being used in conjunction with socket outlets. However, it...

Is the surround wide enough to stand on? If so I'd call it a floor. If you're not sure then assume the worst case interpretation. What are you planning on fitting in the disputed zone?

Just to throw a few of my thoughts in: I think the only thing that is expected to be connected to a fused spur without notifying is some socket outlets. That's why the two are mentioned so closely together. Also, remember that Schedule 4 starts with the phrase "work consisting of". It...

Like 1john says, it's not just about the zones. All equipment must be selected to be appropriate for the environment it's installed in. A common example is a light above a shower. It might be high enough to be outside the zones. However, if the shower head is removable, it can be expected...

IMO the exemption is clearly intended to cover a fused spur with only socket outlets fed from it, nothing else. If the intention had been to include a fused spur feeding any electrical equipment, it would be phrased differently.

Which would you rather replace: a damaged extension lead, or a powertool with a damaged flex?

There is no requirement for existing installations to be brought up to current regs. However, if you have any alteration or extension work done on the installation then the earthing will have to be checked to see that it is adequate. At the moment I'd say it's is far from adequate. I...

This installation doesn't comply with 17th edition wiring regs. BS7671:2008 542.2.4 The metallic pipe of a water utility supply shall not be used as an earth electrode. Other metallic water supply pipework shall not be used as an earth electrode unless precautions are taken against its...

Yeah, I've got the control part sorted. Will probably have 4 or 5 channels of lighting in the kitchen, some of it dimmable, all with clever controls. 8)

That's the sort of thing I was thinking of. The tricky bit is getting the height of the socket just right.

Hi, I'm wanting to install some lights under the wall cabinets in my kitchen to illuminate the work surface. Probably some small fluorescent strip lights. The kitchen has just been built and hasn't been plastered yet, so I'm doing the first fix electrics. I'm wondering what the neatest...

That's the only bit that sticks out as something that should have been sorted when the extension was wired. No work should be done without checking the earthing and bonding. There should be a tick box on the electrical certificate to say this has been checked and is satisfactory. It is...