
In our house fire the RCD took out the lighting circuit fortunately the kids were out the front door as it tripped ..
I've a couple of led battery PIR lamps which are fine for not falling over flea tard the cat that sleeps in the stairwell top "well" but not much else at a rush ..
So I added this to the top of the landing..
Just needed a 32 mm hole into the plasterboard and wires into a covenant constant power supply. There's a link out the bedroom light to the landing smoke detector 3' away so I linked into that using some 1mm^ ho5vvf flex (this is suitable for the task) protected by the 6a rcbo at the fuse box standard domestic 6242y (grey solid core domestic cable isn't flexible enough to facilitate maintenance if needed as you draw the battery back through the hole if needed I left 2m of slack to facilitate future maintenance that way I can lower it to avoid working off a ladder at the top of the stairs ..
The wiring box is tiny and I used some boot lace ends and a crimping tool to keep the wire strands tidy and secure..
This was when I tested it on the bench before fitting
The white insulation should carry into the casing and the lid forms a cable grip ..
So ....
To put it simply the power goes off the unit senses the loss of power and switches on the led lights and runs for 3 hours using the latest lithium iron phosphate (life) battery pack
Ignore the brown hole next to the lamp tried to putbit inline with the lighting but there's a blooming stringer between the joists in the way above it's filled just needs a brush of white paint once the filler is dry

There's a green status led that shows all is well it's a tad bright so I rotated the coloured bezel (comes with white silver and black to match the ceiling / other light fittings/ fixtures to cover the led you can still see it but it's not as obtrusive.... Bit bright enough...