Non combustible cable supports in escape routes.

[dlt27]

Hi all, I have just read a report by BRE on the effects on cable supports caused from fire. It stated the obvious about the plastic clips, plastic conduit etc failing. However what I found interesting was that the metal supports failed due to the plastic rawl plugs failing. So I just wondered what is the point of using non combustible supports if the rawl plugs fail. ( in concrete that is). Does this mean we should be fixing saddles up with those concrete screws rather than plastic rawl plugs!

 

[plantpot]

Sorry "Shirley tower fire"

 

[Marvo]

I'd imagine it's not the raw plugs getting hot directly from the fire, it's the heat transferred through the bracket and the screws. If the rawplugs are polyethylene they'll melt at maybe 120-140 Celsius so I'd imagine it could be an issue. Maybe drop-in threaded anchors and thread rods would be better.