Hiding Wagos in ceiling void

Terminals, whether wagos or conventional choc blocks should be enclosed (building materials can form part of that enclosure provided they have the necessary fireproof qualities (plaster or masonry OK, timber definitely not). I reckon a dry lining box and a lid makes an acceptable enclosure in principle - whether the aesthetics and practicalities work for you is another matter (I've had problems in the past where the blank plate screws are obstructed by the fitting, while fixing the fitting to the blank plate needs access to the back of the plate ... and ended up with self clinching nuts, which is bit "unusual").

   - Andy.

put a dry lining box into the ceiling with plastic blank plate to house some Wago connectors, and screw the light fitting to the blank plate?
Yes, if the fitting is light enough. Even if not socket boxes and cover plates make can be used as  'accessible from below' junction boxes in rooms under flat roofs and so on. Not the most elegant, but quite handy sometimes, in less obvious places. also the plasterboard mounting round "conduit" boxes can fit under a large ceiling rose with a flatter cover plate.  
And there are very slim junction boxes  or even smaller for such situations as well that can post into the void through a slot behind a fitting 

regards Mike.

Good point - I'd just assumed a round dry-lining box for a ceiling (with a plastic round conduit box lid as a cover)- you very rarely see square/rectangular anything on ceilings - as they'd look very odd unless kept parallel with the walls, and you can't use anything simple like a spirit level to get the angle right on a horizontal ceiling,

   - Andy,

I thought about posting a junction box through the hole in the ceiling - whilst it would certainly fit behind the plasterboard, the space available means I wouldn't be able to post it up (vertically) through the hole and rotate it to lay horizontally on the top of the ceiling, so it would involve removing and then replacing plasterboard in order to fit it.

Thanks for these ideas.

And these really big round plate things can be used behind a ceiling rose when you have had to chew up the plaster to fit blocks of wood or something to spread the load or move things over a bit to reach the joists. (they are nearly 6" diameter and intended to cover holes left by  fire alarms.)

There is always a way out - it depends on the customer's tolerance for 'ugly' . Maybe my seeing and doing odd job stuff in scout halls and so on sets some of my methods a notch below landlord cheap-out ;-)  I should also perhaps sound a note of caution that I don't do  wiring for a living these days, I may be a bit behind.
Mike.

Maybe a quick wire junction box would be thinner, but still has the length issue.

If you used normal screw terminals would the connections fit inside the light fitting? Wagos are quick, but take up a lot of extra space.

If not as you say a dry lining box, quite often it's possible to install a light fitting over the top of circular ones. The screw holes line up nicely with the holes in the mounting bracket.

Or cut a circular hole, install the maintenance free box, put a wooden batten across the inside of the hole, secure with a couple of screws, then use screws to secure the circle of plasterboard and then some filler.

Stephen Hill said:

nfortunately there isn't enough room above the plasterboard to fit a Wago box

Is there enough room for one of these: https://www.wago.com/gb/electrical-interconnections/discover-installation-terminal-blocks-and-connectors/wagoboxpro ?

They are only 28 mm high ... or as per your earlier post, would you have a job getting it through?

If the light fitting is over the top of the dry lining box the fitting acts as a cover to the connections, it is no different to the normal connections behind any fixed light fitting. They are accessible when the fitting is removed from the ceiling but not when it is on the ceiling. This is presuming the light fitting completely covers the dry lining box and you have enough ceiling space to fix the light to the ceiling. There is no need to fit a blank plate.      Gary