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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.

Looks like you have switched it to display export. Probably just a couple of button presses needed.

1/6th of the wall thickness - in other words 16.6 mm for a 100mm wall.

Will you be able to access these drivers when they go faulty?

Thanks for all the answers. I'll review them with interest.

Let's suppose you need to install a Ring Final in steel conduit. This would seem to involve a ring of steel conduit in which you might fit each piece of conduit by screwing it into the previous piece. The last piece would seem to need to be screwed into two female threads and unless one of them...

It wouldn't surprise me. Cheapest possible transformers in power supply circuit are very likely to buzz.

Sorry, I must have taken to mean "they changed all my tails to 16mm² ones".

Mmm... seems odd for anyone to go to the effort and expense of replacing a large cable with a smaller one just because it could carry too much current. Still, I've given up trying to understand people.

Everyone has been putting in 25mm tails forever now regardless. (imho)