AMD2 - Clause 422.2 - Cables in protected escape routes.

Note sure. The IET presentation on youtube seemed to indicate that it was beyond the scope of BS7671 to comment or regulate on fire safety regulations, thus rendering the responsibility beyond the electrical aspects of a project. At least that is how it came across to me.

Why did it make it through the dpc? Never underestimate the ability of logic to quickly depart from the process of creating regulations of any kind.

www.youtube.com/watch

From what I recall from the webinar a protected escape route is a very particular kind of escape route - designated by whoever is in charge of the fire design - and is likely to be places like sterile fire stairwells where's there's nothing but steel and bare concrete - rather than an ordinary corridor that happens to need 60/90/120-minute rated walls or whatever

What I didn't quite follow is what you're supposed to do where there isn't a modern fire precautions design (say rewiring an existing building) which might have something fairly similar but was never formally described in those terms and you've no-one to ask.

   - Andy.

I'm just concerned that if corridors become fire rated due to compartmentation then they become defacto protected escape routes and then the clause is triggered.

I started to view the video clip. I will watch it in its entirety when I have time, BUT why is the quality so bad? For an organisation called the Institution of Engineering and Technology why can't it get the poor sound quality sorted our. There is bad reverb in an early presentation. AND why can't the speakers enunciate clearly, speak slowly  instead of gabbling and mumbling?

3/10.

Z.

The provided definition of "protected escape route" in Amd.2 is woefully sparse if that is the case.

Appendix 13 explains more details. It does not seem too difficult to comply.

Non combustible conduit, such as steel conduit or trunking  is acceptable, as is bare M.I.C.C. cable. Expert fire safety advice may be required.  

Z.

I read that as being only for the permitted circuits serving the installation within the protected route - lighting, emergency lighting, fire alarm, cleaner's socket.

The main concern as stated in Appendix. 13 is that of allowing a safe escape from a building in case of fire where escapees travel a longer distance  than normal. This may occur in large and more complex  buildings. The removal of flammable materials is a wise one. Flammable materials may cause toxic smoke and also restrict visibility.

Z.

Its the escape route designated in the fire escape  plan that flowed from the Fire Risk Assessment. 

That's a pretty onerous definition of 'protected escape route'.
Would mean no containment runs down hotel, school, flatted accommodation communal corridors.