Chapter 52 Selection and erection of wiring systems
Regulation 521.11. 201 giving requirements for the methods of support of wiring systems in escape routes has been replaced by a new Regulation 521.10.202. This is a significant change. The new Regulation 521.10.202 requires cables to be adequately supported against their premature collapse in the event of a fire. This applies throughout the installation. Not just in escape routes.
Years ago this could be done, however
when this was banned then we were forced to revert to plastic rawplugs, I have not found any replacement other than very large metal units which are not affected by heat, yes you can put clips inside the trunking but those clips are again only held with plastic rawplugs.
"premature collapse" is rather open, health and safety wise unless some one is inside a house the fireman should not enter if he is likely to be trapped, unless we have a fire sign on the door saying this house has modern fire resistance fittings then how do they know if safe to enter?
OK with a old peoples home with people who can not get out without assistance and even then long corridors, but in a private house what is the point? So looking at
reported fires in the area it does seem the fire brigade have a very slow response time, OK car park not a house, but it seems from reports they took 12 minutes for first appliance to arrive, that is in a fire a long time, since new houses now need a sprinkler system, I assume because the fire brigade is so slow, it seems a bit daft to worry about rawplugs melting and wires falling out.
Even parts of the concrete floor melted, and you are worried about cables dropping, get real.