Twin and Earth cabling

It all rather depends who is the design authority signing on the dotted line that it will be OK.
I presume the original poster is not the main consultant, as it seems they are not in charge of the design - the snippy answer of course is to go and  ask the design authority - after all this is what they are paid for, but it maybe that in this case the person 'in the hot seat' is not that clued up on electrics.

Someone will be deciding he construction of the partition walls - and if for example those partitions might be have sharp metal inserts that may damage T and E, then the correct cable and or routing method needs to be defined. You need to find that person, or to be that person dictating the spec. (this sort of thing is common but needs great care - pulling wires in with abandon can strip it to the copper and create a live wall .. )

In un-insulated partitions the cable would be pretty much  in free air, so I'd use the clip direct figures perhaps less 10% for luck (but note that indoor meeting rooms often have insulation in the walls, not for heat but to provide  acoustic privacy - so unfilled partitions are not always a certainty.)

Unrelated but  I think  I have seen plenty of TnE in baskets without a mat , and the only instance of deformation damage I can think of is when there was a huge bundle of it so the compression force was from the weight of many cables above, but maybe avoid the cheapest basket with really thin wires widely spaced.
Mike.

It all rather depends who is the design authority signing on the dotted line that it will be OK.
I presume the original poster is not the main consultant, as it seems they are not in charge of the design - the snippy answer of course is to go and  ask the design authority - after all this is what they are paid for, but it maybe that in this case the person 'in the hot seat' is not that clued up on electrics.

Someone will be deciding he construction of the partition walls - and if for example those partitions might be have sharp metal inserts that may damage T and E, then the correct cable and or routing method needs to be defined. You need to find that person, or to be that person dictating the spec. (this sort of thing is common but needs great care - pulling wires in with abandon can strip it to the copper and create a live wall .. )

In un-insulated partitions the cable would be pretty much  in free air, so I'd use the clip direct figures perhaps less 10% for luck (but note that indoor meeting rooms often have insulation in the walls, not for heat but to provide  acoustic privacy - so unfilled partitions are not always a certainty.)

Unrelated but  I think  I have seen plenty of TnE in baskets without a mat , and the only instance of deformation damage I can think of is when there was a huge bundle of it so the compression force was from the weight of many cables above, but maybe avoid the cheapest basket with really thin wires widely spaced.
Mike.

mapj1 said:

Unrelated but  I think  I have seen plenty of TnE in baskets without a mat , and the only instance of deformation damage I can think of is when there was a huge bundle of it so the compression force was from the weight of many cables above, but maybe avoid the cheapest basket with really thin wires widely spaced.

Sadly, I;'ve seen the worst of this, as well as the option of keeping the T&S close to a horizontal part of the basket ... although I still couldn't assume the T&E would be OK even in the latter case, because the diameter horizontal wire of the basket is less than the width of the T&E.

All I can say, is that the cable is not likely to be designed for that purpose, and may be subject to mechanical damage.