Discuss Smoke Detector Wiring in the UK Electrical Forum area at ElectriciansForums.net

Where non metallic cable trunking is used in escape routes suitable fire resistant means of support can be used inside the trunking
Regulation 522.11.201 so can't see the problem if pvc conduit/ trunking is used as long as it has metallic supports for the internal wiring.
 
Where non metallic cable trunking is used in escape routes suitable fire resistant means of support can be used inside the trunking
Regulation 522.11.201 so can't see the problem if pvc conduit/ trunking is used as long as it has metallic supports for the internal wiring.
Thats right. Be aware though how you fix the internal metallic supports to the building fabric. We recently had an LPCB inspection and they no longer accept plastic plug and screw as a fire resistant method of supporting anything on an escape route. They are now expecting metal rawl plugs or frame fix type screws without a plug. In tests they carried out, plugs melt and drop.

Same goes for surface P clipping or saddle clips they expect metal plugs or frame fix screws.

See attached.

IMG_3966.JPG
 
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Nothing to do with cable fixing but flame propagating systems on an escape route, not at home to check Regs though.
 
Thats right. Be aware though how you fix the internal metallic supports to the building fabric. We recently had an LPCB inspection and they no longer accept plastic plug and screw as a fire resistant method of supporting anything on an escape route. They are now expecting metal rawl plugs or frame fix type screws without a plug. In tests they carried out, plugs melt and drop.
Self drilling masonry screws are the way forward.
 
Nothing to do with cable fixing but flame propagating systems on an escape route, not at home to check Regs though.
That regulation mentions absolutely nothing about flame propagating systems just supports.
Pvc containment is not prohibited as long as cables have metallic supports to prevent premature collapse.
Regulation 422.2.1 which can mean LSoH cables
 
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Think we are at odds with different Regs, I get the cable fixing bit but it is the use of flame propagating materials on an escape route can't check it out at the moment.
 
Last NIC/Elecsa 'web in air' vid I watched, Cable & Stantiforth stated the use of 'plastic plugs' were still deemed to be acceptable in such situations, it was the 'clip or fixing' that has to be metal or fire resistance. Seems, their advice comes from some document or study, suggesting the plastic rawplug, would survive fire due to the surrounded concrete or brick structure.

Once again, these 'organisations & bodies' need to have some sort of joined up thinking, and stop offering conflicting guidance.

Or is it the case, some manufactures sense a marketing opportunity. :)
 
Once again, these 'organisations & bodies' need to have some sort of joined up thinking, and stop offering conflicting guidance.

I've just seen a pig flying past the window.... and IF, I say IF the IET got its act together, the "variety" of interpretations wouldn't be required..
 
That regulation mentions absolutely nothing about flame propagating systems just supports.
Pvc containment is not prohibited as long as cables have metallic supports to prevent premature collapse.
Regulation 422.2.1 which can mean LSoH cables
422.2.1 states wiring systems shall be non-flame propagating. It is there in black and white.
 

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