Yeah, this is on an intruder panel. Shall use ply as you suggest.

fast fix circular box.

job done!

fast fix circular box.

job done!

not sure that complies mate (not that we haven't done it) as the circular box isn't fire resisting? in reality, some ceiling you can't use a galv box so it will be plastic.

The 8 core cable aint fire resistant either-in reality some fire detection hooked up to the intruder system is better than no fire detection at all,token gesture,and imho better than standalone smokes.

not sure that complies mate (not that we haven't done it) as the circular box isn't fire resisting? in reality, some ceiling you can't use a galv box so it will be plastic.

Yep you can and im talking 5839. We use porcelein conectors IF we have to make a Joint BUT not when the joint is behind a detector. How is the fire integrity diminished when the appeture is protected and sealed by a Smoke detector. False ceilings are only half hour and one hour IF clipped down to the grid. Appetures have to be sealed and the detector does the job.

These + 2 glands. Beats Galv every time in false ceilings.

http://www.marshall-tufflex.com/shop/section.php/161/1/circular_dry_lining_boxes

These + 2 glands. Beats Galv every time in false ceilings.

http://www.marshall-tufflex.com/shop/section.php/161/1/circular_dry_lining_boxes

We have used loads of these on plaster ceilings

We have used loads of these on plaster ceilings

cheapest way to fit heads IMHO

We have used loads of these on plaster ceilings

Agreed but definately 20mm B/E U box on false ceilings. You guys wasting your dosh on galv pehh!

Another note: i never conect the earth to the detector base. i use a yellow crimp and earth the U box with a single M4 (2x 1.5 in single crimp).

Isnt that what i suggested!?

We always knew them as fast fix box.