Protected corridor lighting cabling compliance

As with many things electric, there’s more than one way of choosing light fixtures, V-TAC a lighting manufacturer comment on their website “If the aim is to create a strong barrier against fire, then fire-resistant lights with 30, 60, or 90-minute ratings are the best option. On the other hand, if the goal is to provide a safe escape route during fires, lights with TP(a) or TP(b) rated covers are the way to go.”.

www.vtacexports.com/.../what-are-fire-rated-downlights-understanding-tp-a-and-tp-b-covers

So back to the ceiling, if the suspended ceiling is a fire barrier,  is the void above the corridor ceiling in the corridor?

The light fixture referenced above is TP(a) Rated, I presume it’s not actually fire rated and won’t stop a fire breaching the suspended ceiling if it is a fire barrier? So the void above the ceiling is in the corridor?

www.lighthubdirect.com/.../emergency-pro-tpa-1200x600mm-led-40w-140lm-w-light-panel-recessed-for-office-suspended-ceiling-white-4000k-neutral-white

As with many things electric, there’s more than one way of choosing light fixtures, V-TAC a lighting manufacturer comment on their website “If the aim is to create a strong barrier against fire, then fire-resistant lights with 30, 60, or 90-minute ratings are the best option. On the other hand, if the goal is to provide a safe escape route during fires, lights with TP(a) or TP(b) rated covers are the way to go.”.

www.vtacexports.com/.../what-are-fire-rated-downlights-understanding-tp-a-and-tp-b-covers

So back to the ceiling, if the suspended ceiling is a fire barrier,  is the void above the corridor ceiling in the corridor?

The light fixture referenced above is TP(a) Rated, I presume it’s not actually fire rated and won’t stop a fire breaching the suspended ceiling if it is a fire barrier? So the void above the ceiling is in the corridor?

www.lighthubdirect.com/.../emergency-pro-tpa-1200x600mm-led-40w-140lm-w-light-panel-recessed-for-office-suspended-ceiling-white-4000k-neutral-white

The suspended ceiling is not a barrier so effectively the void is in the corridor, it's being treated as one space. The fittings selected are not fire rated as the ceiling is not a barrier so we didn't think it necessary. I've already spent time on this and spoken with manufacturers and Fire advisors etc, I was really wondering if anyone else has come across this issue and how they handled it. It sounds as if it's one for the manufacturers.

On a side note I've had Building control reject plastics of any kind in protected staircases including the TPA & TPB types.