You can get m4 bolts in pz2 or torx from jr Webster ect for around the same price always use theese on fire alarms especially xp95 sounders can be a right pain torx are the better
Looks iffy to me seen a few pms systems during periodic s with the incoming neutrals not connected and the Earth neutral linked to fool the metre abstraction at its finest
I would be more inclined to install 3 phase supply if available and tap of phase and neutral per hook up point you could use 16mm and still have scope for additional load should it be required
Fit a interlocked socket 16a you can get them with room to fit a mcb or rcd on din rail in the same enclosure quite a few companies do them ilme ,Garo ect
Wow if you honestly don’t know how to get single phase from a 3 phase supply you shouldn’t be let loose near electrics
btw the isolator in the db is only 2 pole so my gues would be that it is a 3 phase db with a single phase conversion kit
I think you proding around in there has made things a lot worse if you’re that concerned get a eicr instead of messing yourself no questions it dosnt look great but you have definitely made things worse
other option is a smart switch and recever via a contactor in the attic
done a huge industrial kitchen few years ago with all the circuits on a mk grid switch via 16 contactors worked a treat client wanted nothing on show
Most of the time it isn’t the fixings that fail but the plasterboard themselves anything over 5kg I would recommend installing a mounting board between joists
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