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You could do that. I imagine that it comes like that so they can supply the same cable with their 1, 2 and 3-phase versions.

What is that in reply to? A thermostatic mixer shower will work connected to mains cold and combi hot, with no pumps anywhere.

Fan instructions generally include a diagram showing a 3A fuse in the supply. In typical UK installations where the fan is powered from a 6A MCB lighting circuit, this instruction should be ignored. If an FCU is used, it should supply both the perm and switched live to the fan - and hence also...

All fine. Just use the cable.

That suggests that your lifestyle leads to high humidity, but you said: 55% is fine - but do I believe it? So: Do this, and let us know what the actual humidity is. Get the second-cheapest ones then. Don’t expect them to agree exactly, and note they take a while to stabilise when the...

No, they’re not fibre optic; just thin copper wires.

Yeah, mine is basically the same.

The cheap ones are so cheap that in a sense you can’t go wrong. I bought one. I think it would take a fair bit of trial and error to learn how to use it effectively. In particular, it’s not trivial to get it pointing in the right direction or to recognise what you’re looking at. I think that...

Is this a genuine question where you don’t know the answer, or are you looking for sympathetic messages of support? Both are available here, but it helps to know where we stand. You seem to have had a bad week, with this and the damp proofing complaint; sorry about that!

Often cookers have the possibility of being connected to a 3-phase supply, which would require 3 lives, a neutral and an earth. Are you sure yours has 2 lives and 2 neutrals? If so, maybe they’re using the same cable for the 3–phase and the single-phase versions. (Has anyone else ever seen...

Cheap but good-enough water pressure testers like the one in the photo in Madrab's post are available on eBay for under £15. Don't mess around with compressed air.

No:

Ancient thread!!!!!

“Single plus earth” is a thing: https://www.cef.co.uk/catalogue/products/2326306-6241y-1-5mm-single-core-cable-brown-grey-100m-drum The earths should have been joined together in a terminal of some sort, not just twisted. Yes. Don’t loose track of which red wire is actually neutral. Put...

Is the fan switch a “fan isolator”, i.e. a very wide switch?

Why, what’s wrong with it? That’s what I’d want to do.

So where is the other end of that cable now? I think I can identify it in the very first photo. Is it one of the cables in your new junction box, or not? Note there is no guarantee that the wires in the fan isolator actually have the roles marked on the switch.

I’m unclear about how this works - you say that the extractor runs when the lights are on, but you also mention an extractor fan switch. What switches do you have, and how to they behave?

Don’t worry, they’ll be fine. It’s a good sign - they aren’t dead.

Not the worst I’ve ever seen, but I’d re-do it properly. Ideally use rigid ducting, with a constant upward gradient. Then any condensation would run back to the shower. If you fitted a condensate trap, where would you drain it to? It should probably be insulated. (Is that a boiler terminal in...