Eh up 
Time for another daft question. Nothing specific, I'm after thoughts on the proper way to, for instance:
I know the forum rules... no asking a question until you've given your own thoughts, so here's some of mine:
Regarding (1), there are various methods that could be used for just a simple thing like a security light on a house, and the merits of putting in some conduit through the wall to pass the cable through (or not) have been discussed in many forums. T&E exposed to the elements seems to acknowledged as A Bad Idea. Talk of plastic conduit externally elicit some sucking of teeth and the mention of expansion joints (and also drilling a hole at the lowest point in the run to allow condensation to get out), whilst others suggest rubber flex or even arctic all the way back to the junction box/accessory inside. On the side of an industrial unit, I imagine you'd like to use steel conduit or SWA to adaptable boxes near the lights (if long runs and couldn't run cables internally). Is there a standard sealant you'd use to protect water getting in (where the cable passes through the external wall), and how would you do this on a steel building?
Regarding (2), this sounds like the job for some sort of fire rated expanding foam... again, is there some standard stuff that everyone uses? Can we be sure it won't damage the PVC sheath?
Regarding (3), obviously there's tray, ladder, conduit, trunking etc and these are all great. Plastic cable ties used on vertical runs? Plastic clips to support SWA (not a fire escape route)? Extra CPC cable-tied to the SWA rather than clipped to wall directly (was told to do this, recently)? Are there fire-rated (metal) cable ties? I'm aware of galvanised band, but this would seem to be a bit overkill for many situations.
Just after thoughts, really.
Time for another daft question. Nothing specific, I'm after thoughts on the proper way to, for instance:
- pass cable through various stuctures (bricks, steel buildings) to avoid damage to cable, look good, and avoid water ingress
- maintain/restore fire and sound barriers after passing trunking/conduit/cables through internal walls, or at the back of a domestic CU
- provide adequate means of support for cables, both for fire escape routes (thinking 521.11.201 in Amd3) and areas that are not fire escapes
I know the forum rules... no asking a question until you've given your own thoughts, so here's some of mine:
Regarding (1), there are various methods that could be used for just a simple thing like a security light on a house, and the merits of putting in some conduit through the wall to pass the cable through (or not) have been discussed in many forums. T&E exposed to the elements seems to acknowledged as A Bad Idea. Talk of plastic conduit externally elicit some sucking of teeth and the mention of expansion joints (and also drilling a hole at the lowest point in the run to allow condensation to get out), whilst others suggest rubber flex or even arctic all the way back to the junction box/accessory inside. On the side of an industrial unit, I imagine you'd like to use steel conduit or SWA to adaptable boxes near the lights (if long runs and couldn't run cables internally). Is there a standard sealant you'd use to protect water getting in (where the cable passes through the external wall), and how would you do this on a steel building?
Regarding (2), this sounds like the job for some sort of fire rated expanding foam... again, is there some standard stuff that everyone uses? Can we be sure it won't damage the PVC sheath?
Regarding (3), obviously there's tray, ladder, conduit, trunking etc and these are all great. Plastic cable ties used on vertical runs? Plastic clips to support SWA (not a fire escape route)? Extra CPC cable-tied to the SWA rather than clipped to wall directly (was told to do this, recently)? Are there fire-rated (metal) cable ties? I'm aware of galvanised band, but this would seem to be a bit overkill for many situations.
Just after thoughts, really.
