Protected corridors and ELV cabling

Just check that your corridor is still covered by 422.2.1 - the 2023 corrigendum tweaked the definitions somewhat - and it seems to apply only to "a firefighting lobby, shaft or staircase of a protected escape route".

If it does apply, I see nothing with limits the requirements to LV cabling. I suspect part of the issue is smoke etc from cables when they're burnt - the fact that they're ELV rather than LV would make little difference in that regard.

  - Andy.

Thanks Andy that was my view also but wanted to get other views. Regarding your point on the exception of "protected corridor" the ELV cable serves the apartment by routing along protected corridor. The cable couldn't however cross any other type of protected escape route (unless fire encased) because it doesnt serve the protected escape route. 

Yes, because it's about the smoke etc. produced in a fire impeding escape etc.

BS 7671 applies to ICT cables as well as power/control (as required by BS 6701). This includes optical fibre cables.

Worth checking/specifiying the cat6 is LSZH (Low Smoke Zero Halogen) as normal cat 5 or 6 cable can be PVC sheath.  If you burn a piece of PVC cat6 cable it lets out nasty black smoke which is acrid.  Some will also let out Hydrogen Chloride gas which when mixed with water gives you Hydrochloric Acid

Remember LSF(Low Smoke Fume) is not the same as LSZH