Thanks to Alan Belson for the following:

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Here are some pics of Legrand's 'Mosaic' receptacles being fitted, [to first fix] in our remodel. These are an interesting departure from the traditional 'pull it all out of the wall by the guts' design, and while a bit complicated they work very well indeed, being firm and solid with lots of themed options. The design is modular, with a choice of gangs and module outlets. Still made of thermoplastic and not bakelite, but a great improvement. There are other options in the catalog- too many to post here.

Description below each photo.

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Pic 1. Drill 65mm holes for plastic drywall box with holesaw. The boxes have 'pilot holes' for accurate marking of drill positions.

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Pic 2. Fit box. The duplex and triplex ports need slight trimming with a Kraft knife to link the diameters. Fix is by 'tongues' screwed up behind the drywall, which in this case is 13mm/1/2" thick. Tongues 'auto-locate' with a clever cam mechanism, which works fine.

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Pic 3. Fit Plate. Duplex shown, this is heavy-gage galvanised and passivated steel. The screws are already in the boxes and fit into keyhole-slots for easy assembly and levelling / squaring up.

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Pic 4. Fish cable through box. It's necessary to break out tabs in the box rear to suit cable or 16mm plastic sheathing [ gaine ]. Here, the other side has not been plasterboarded yet, making wiring easier.

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Pic 5. Showing modules snap-fitted after wiring live/hot neutral and earth/ground. No polarity is shown in the module, but I always wire up with live on the left, earth at top for consistency, see later pics. The module snap-fit is strong and impossible to remove without tools. Note my mistake- drilled too near a stud, but easy to plaster a saw-waste disc back in with some spackle!

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