One of the sleeved blues should go into the other switch, without looking at the back box or belling it out, it’s impossible to know which one. The rule with two way lighting is, whatever colours go into L1,L2 and Common in the main switch goes into the same one in the other, si your yellow...
I think here is an error in both switches.
The red and blue in pic 4 definitely need separating, but in the other pics, it appears that the non dimming switch has both sleeves blues going into it, when one should be going into the dimmer. It appears there are two, two-way switches there, but...
That does sound like a two way wired switch. My advice is the get an electrician to look at it and see what the issue is, as it may need a bit of investigation and some wiring at the switches altered
My apologies and to the OP. It was inappropriate sarcasm based on what will probably end up happening anyway
As the others have said here, the connections, for safety, should be in an enclosure, such as a ceiling rose or a Hager J501.
But most importantly, don’t guess it, if you’re unsure...
That looks like an old style two way switching system. The single wire is the switch line. It was how things were done prior to 3C &E cables coming along. It’s done the same way as doing two way in singles.
I recommend getting a good (old) electrician who remembers it.
Put the two reds together in a connector block and put insulation tape around everything to avoid anything accidentally falling into or touching the screws or connections
I understand it’s a recommendation, but 532.6 says “shall be installed” which usually means “will be installed”
The helpline say, do a risk assessment when installing to explain why it hasn’t been fitted! I’ll just do that and as others have said, put it on the higher rated circuits for now and...
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