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containment was designed to house single insulated cable ?
twin and earth was designed with its own incorporated an outer sheath so to be ‘clipped direct’
so why are we bothering to contain twin and earth cable
???
Containment was/is designed to house cables, all types of cables, not just single insulated cables.
Why not put T&E in containment where there is a lot of it going the same way?
Lots of cables incorporate an outer sheath allowing clipped direct installation but are installed in or on containment regularly.
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The old house I grew up in was wired in the 50s with VIR and buckle clips
Which proves that cowboys were at large in the 50's just as much as they are today.
VIR was/is single insulated cable and should always have been inside conduit/trunking, clipping it direct was no more compliant then than singles clipped direct woukd be today.
The predecessors to modern T&E were suitable for clipped direct installation such as lead sheathed rubber insulated cable or TRS sheathed rubber insulated cable.