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By comparing the generation meter with the import meter, or for a real time display buy a suitable meter with sensors on import and export cables, and you can have an instantaneous net import figure. I use the Wattson, but that is unfortunately no longer available.

Just interested, nothing more, but do you happen to know which part of BS EN 50131 covers this requirement? { Part 1 System requirements Part 2-2 Requirements for passive infrared detectors Part 2-3 Requirements for microwave detectors Part 2-4 Requirements for combined passive infrared and...

By the way, if you live in Llw******y, it might be an idea to also hide any QR codes you post on-line.

It was hard going finding it but I think it's BS 4662:1970 Specification for boxes for the enclosure of electrical accessories. The date doesn't make much sense - maybe there was an earlier one. Trying to access the spec on my file server but it's playing up.

But he also said: which is simply not true - unless you don't have a light in the room.

I must have one of those very few. And your edict did not allow for exceptions.

Surely it depends on the bathroom?

LEDs use MUCH less current today than the early ones. You can light a modern LED by holding one lead and touching the other lead on a random piece of metal. Every time we buy a new batch of LEDs we have to raise the resistor values in the circuit to avoid burning out the customers eyes.

With the 300k resistor, the breakdown current will be limited to well below a damaging one, so you are safe on that score. Breakdown voltage is how zener diodes work in their normal mode of operation.

Yeah, we know.

My son has a new old house. As the toilet ceiling fan didn't seem effective they decided to put a new fan in. On taking out the old fan they found it went into a duct , ran a meter towards the other end of the ceiling, and came down through a vent again.

Where on earth (in your case, flat earth) do you get that from.

It was a dangerous joke.

Citation needed!

Well, I guess that can only measure current, and the 40W assumes 230/240V (174mA). It doesn't take into account power factor. So something like a permanently connected power supply with no load connected may be able to give this, but usually lighting 'transformers' are switched at the input so...

I disagree with your tortuous logic.

I think it was meant as a joke...

Both the socket and the plug now need replacing...

When this happens you must change the plug at the same time.

That is essentially for building consumer units out of parts from different vendors. It has nothing to do with whether you must use an isolation switch.