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google 20mm compression glands for T+E, Tlc sell them about 2 pound each, they have an oval slot rubber

could you use 1 of each type in series

Its a TN~S system, Looks like 2 cables, its possible your neighbour has same problem

You say the connecter is rated at 10a but no mention of the plug rating, most moulded plugs have a rating embossed on them, usually 5a or 10a and occasionally 13a. 1 would not expect the fitted fuse to exceed the plugs rating. As for your suggestion a lower rated fused lead might get used...

All off is 2 minutes,all on is 2 hours according to what you posred above

I mentioned an mcb used as a fcu years ago, during a discussion on here regarding what accessories are allowed on a ring and noone believed me, i'm not sure when it got deleted as i was at college early 80s. This reg would likely have allowed 16a commando sockets off the ring which may have...

If the textured ceiling is not smooth and holding off the metal bezzle then id quess the gaskets were not doing much anyway

T and E is not ideal in a plug, however if you must, take L, (E) and N both to the switch first then L (E)and N from switch to light. Alternatively light first then onto switch

Them terms are now obsolete been replaced with codes. The switched maintained was more popular with tubes, reason being to prolong lamp life by not having them lit 24hr and only when building occupied. Sustained fittings have 2 independent lamps for similar reason not to deplete the lamp life...

When you do the other switch, you will likely see the same colours there, however with a Red and Black pair also bunched in with the yellow and blue cores.

Ok, looks like they will send you it in parts, the dimmers they give you are 2 way according to the makers website, what made you feel there 1 way

That looks like self assembled BG Nexus grid, it is rare to buy it like that as you usually buy the components you need. where is that pic from. Nearly all push on and off dimmers are 2 way, whereas rotary on and off dimmers are always 1 way. Rotary dimmers are rare nowadays

Them lampholders not really suitable, should now have extra insulation and cable restraint. Your lampholders and them open fittings is how things were done years ago. Not ideal but ones from screwfix may do the job

I missed where you mentioned app sorry, most of them stats have volt free contacts which you can use but you need to check there ratings, usually somewhere in the manual, some salus units have 16A res 5A inductive contacts, which is ample for over 1000 watt of any load, other makes may vary

Are you sure there's not a stat built in, what's the make and model of the heaters

Surely you can use any empty box and just use connecter blocks inside to join the wires if the tape comes prewired. What 6 core tape are you using? RGBW 5 core is more common

Turn the power Off, you should not be live working. Just do a continuity test between red and black of each. Operating the switch will toggle between open/closed circuit on your meter

A lot of the medical sites we do have them, apparently it aids the staff who often wear some form of gloves It allows them easier switch operation as well as preventing operating both switches inadvertently,. Moreso for the corridor sockets that cleaners use

When you return see if there's others located, that's a newish logic plus and as you say the sign looks old and possibly older than the original logic range. I would also expect it to have outboard rocker switches in a hospital environment Maybe if recent even a grey microbial socket

Yes I agree with you, it would appear that the top and possibly the bottom of the connecters as you say would indeed be single insulated, but the instructions I have seen with similar fittings, insinuate that there supplied box needs to be used. I assume somewhere they may have been tested...