Lighting circuit question

No. Manufacturers instructions should be taken into consideration now, rather than the old wording of 'manufacturers instructions should be followed.'

Nothing is required in the Regs in this respect.

Nothing to stop you putting an FCU with a 3A fuse on a lighting circuit, if that's what it wants - but you have to question what the manufacturer was thinking...

It's the same with bathroom fans - many are run from 6A lighting circuit sand many (most) will say "must be fused at 3A" so you end up with an FCU. Which gets silly if you have the switched lighting input in use - do you fuse that too?

Since it can switch automatically, you must have a means of isolation to make it safe to work on. The fusing would depend on what rating they require. If the requirement is adequately met by the circuits protection then you could argue there is no need for additional fusing.

Thanks, I wondered if that was the logic. Although since it is almost a black box and the bulb isn't replaceable you might argue that the only "work" you can do to it is to replace the whole unit. Many of them come complete with a wire tail. And you wouldn't normally disconnect it from its isolator without isolating the isolator, would you.

But if it says "must be fused at 3A" then I have to do it or it will fail an NICEIC inspection.

Still worth having a switch there, especially on stuff outside. Much easier to check to see if its the thing tripping your RCD or MCB etc, when you can flip a switch rather than climb a ladder and undo connections.

Sharpie pen?