Back box screw hole positions

[EFLImpudence]

The edge of the body is even chamfered to assist the removal.

 

[Deleted member 18243]

Centaur CDLB1-35 from CEF allow for a greater thickness of plasterboard than any other I know of. Thomas Nagy agrees.

(Also available 47mm deep.)

https://www.cef.co.uk/catalogue/products/3920516-1-gang-accessory-box-35mm-white-sold-in-1-s

 

[SUNRAY]

View attachment 187845

Levering out the yellow bit requires that the little arm at the bottom of that picture pops back inside the box; does that really happen without it breaking off?




Yes, and it’s useful to know that! But that doesn’t cause anything to stick out behind the body of the box, so you don’t need any extra depth.



You can get it into the hole yes, but then you need to push them back before pushing them out, and it’s at this point that you need the extra depth:

View attachment 187846

You are correct the Applyby box does need the extra space behind, I had exactly the same problem at the weekend when changing a single for a double. Lucky I was able to drill some of the Batten away to create the space, this is a pic of the box I removed:

Sadly no markings but it is likely to have come from Homebase some 25 years ago.

I will warn though the posts in the corners prevented me using it for a LAP FCU

 

[SUNRAY]

Reading Your post again I see you have a solution Ignore my last.

 

[rsgaz]

Sadly no markings

They are Norslo...

https://www.buildworld.co.uk/merchant/norslo-2-gang-dry-lining-box-47mm-bw-2775

greater thickness of plasterboard

Norslo is up to 30mm.