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It must be, as the alarms have a battery backup, and the interconnect still works on battery only when the mains supply has failed.

For the UK, 3&E flat with brown L, grey oversleeved blue for N, black as the interconnect. Substantially the same as the UK, with the main variations being that their T&E has the CPC insulated green/yellow for the entire length and PVC insulated building wiring is not permitted.

For that box leave both switches on all the time. It only does the hot water, which will operate overnight. If you want extra hot water in the day, press one of the oval grey buttons to give it a boost for an hour. Storage heaters are controlled elsewhere, given that BX2000 box exists they are...

You need 2 zone valves, one for the heating and one for the new hot water cylinder. An entirely standard arrangement used in millions of homes everywhere. As for using - you turn the mixer shower on and hot water comes out of it. The cylinder is heated when it's needed by the thermostat...

AI slop which mostly creates stories some people might believe.

Stored hot water in a cylinder, either unvented if the cold supply is suitable, or pumped if not. Heated via your combi boiler. Certainly not, and even two of them is likely to be overloading the supply.

Fluorescent tubes of all types are obsolete. Don't spend any time or money on them.

The 3000 set is rated for 36 volts, and that is what that power supply provides. Whether they are 'dull' or not is unrelated, that's how they are designed.

Pretty much correct, and the reality is that that 1970s wooden cased fusebox should have been replaced several decades ago.

Instructions copied from some other switch instructions. Or it's AI generated slop. Or both.

Money laundering or other criminal coverups.

No. So the millions of properties that have pendant lighting will get a low rated EPC. As will those that have any other types of light fitting with G9, G4, GU10 and all the other styles of replaceable lamps, and all because someone might go and buy some inefficient incandescent lamps that...

Gravity and the fact it is fixed to the tray with silicone.

Phase balance is mostly irrelevant for the loads found in a domestic dwelling. However with a solar inverter you presumably want to actually use a majority of the energy being created, and if you only connect a single phase to the property loads you will only be able to use about a third of the...

Then there is the question of what is meant by this mythical 'signing off' process.

Not true, and no one cares about EPCs anyway, they are just a thing people are compelled to get when selling a house. They are also grossly inaccurate and only cover certain items that the software knows about.

Never noticed or cared. It's a metal plate with a hole, a glass disc, a couple of springs and a GU10 lamp holder. Warranty not required.

Junction boxes and other connectors are sized on the cross sectional area of the individual conductors. The diameter of the outer covering of a cable is unrelated.

https://www.toolstation.com/integral-led-evofire-fire-rated-downlight-85mm/p58865 with whatever GU10 lamps are desired. Sealed affairs are a fail. Seen far too many from various manufacturers where they have failed after a year or two, exact replacements don't exist, manufacturers warranty...

They certainly did, as in a certain block of flats near here which has FTTP and those exact ONTs from when it was built around 7 years ago. However they have already been abandoned - the battery part still works if people can be bothered to put batteries in it, but when broadband service is...