Suspended Ceilings

[Driller]

Need to fit some smokes to some 2ftx2ft ceiling tiles of the floppy Rockwool type.

What methods do you use for this, use a different tile, plywood backing?

[antinode]

Keep the tiles for aesthetic reasons, but back with a piece of plywood slightly smaller than the tile and fix the smoke through the tile and plywood and into a galvanised stop end or "U" conduit box with some long M4 screws and the relevant glands on the cable entries. I would never do it myself but you could fix them to the metal grid of the ceiling too.

[PeterJames]

Dont forget to PClip the cables

[Lwillis]

As above . Use plywood as a backing and a galv box . And stuffing glands

It can be a bit of a pain to do but makes the job right . ( at least the way I'd do it )

[Rulland]

Nah,just screw into the tile with a inch an quarter no8 woodscrew-so it looks the part and prog as final exit-NSI here I come,lol!.

Twas a jest peeps!.

[Alarm Protection]

As standard we use galv boxes with ply but why the use for galv boxes?

The cable is already p clipped to the detector so no chance of cable falling down?

[norman]

I read it as smoke on an intruder system, so probably 8 4 core

[Rulland]

Its a non conformant addition,no standards/requirements apply,therefore do as one feels fit,recent previous threads cover it all-or not-as the case may be!.

[Alarm Protection]

So another do what you want but some inspectors will agree and some will not with the install?

[james.wilson]

Fire on intruder is ancillary reg wise. If you want to comply then 5839 is your reg