AMD2 - Clause 422.2 - Cables in protected escape routes.

PWW325

That is the definition of a Protected Escape Route. Yes you can run cables down this route on Unistrut and tray. After installation 2 layers of 12.5mm fire resistant plasterboard with staggered joints and a skim coat of plaster gives 2 hour fire protection. That is the way it is already done.

The clause refers to the definition within the regs: "Protected escape route. A route enclosed with specified fire-resisting construction designated for escape to a place of safety in the event of an emergency"

I'm trying to highlight that currently the soffit above a demountable ceiling (if there is a ceiling at all) is quite often the fire line, not the ceiling itself. This new clause now precludes the installation of distribution cabling within such spaces.

I was wondering this. The most recent refurb Job I did we ran all elect services thru corridoors, to each apartment /flat.  However my take on the regs is that most protected routes will have a fire rated ceiling, and that the Ladder/tray is above the protected route as its bounded by the ceiling which is fire rated.  This doesnt get round the fact you need to provide a proper containment using ladder/tray etc.  But allows for other Electrical service sub-mains etc to pass thru the ceiling void above the protected route, which is not in it. IMO.  The revised regs dont change this ?

I was wondering this. The most recent refurb Job I did we ran all elect services thru corridoors, to each apartment /flat.  However my take on the regs is that most protected routes will have a fire rated ceiling, and that the Ladder/tray is above the protected route as its bounded by the ceiling which is fire rated.  This doesnt get round the fact you need to provide a proper containment using ladder/tray etc.  But allows for other Electrical service sub-mains etc to pass thru the ceiling void above the protected route, which is not in it. IMO.  The revised regs dont change this ?