Bell wire in consumer unit - against regs or dangerous?

[rubberduck]

Hi

I recently installed a Nest hello doorbell and used one of the transformers that fits in to the CU. The transformer is fed from a lighting MCB using 2.5 mm2 singles that I took from some T&E. The output from the transformer is bell wire and exits the CU in to a small bit of trunking before going through a partition wall.

By chance was watching a sparky youtube today and he mentioned you shouldn't have bell wire in the CU. Is this against regs and or particularly dangerous? If so, what is the danger? I guess the best solution would be to run some T&E out of the transformer to a fuse and then bell wire out of there to the doorbell and chime?

 

[Tinders]

Id at the very least be putting it in some trunking or conduit. I thought the cable should be double insulated. The output from the transformer wont be 240v ac in any case will it? Also wouldnt this be classed as a new circuit so essentially notifiable?

Ive been following a few sparkies on YT aswel, it seems orifices should be inacessible to finger, so where ever the cable is exiting, you shouldnt be able to get your fingers in etc.

 

[lewism]

Long story short. You're fine. If you wanted to do it tip top you could wire it in single core from the load side of the transformer to a 1 gang pattress with a blank plate and connect to the bell cable from there. It's mainly to do with insulation/interference of the cabling but for such a small distance I wouldn't bother.