Why do people twist CPC's?

Back in the olden days, before even my time, it was usual to twist  the shielded  CPCs of T&E outside the junction box with no other form of connection other than the odd blob of solder occasionally, often on top of the box it so it became impossible to open the box without the CPCs being untwisted. Of course it was quite common for lighting circuits not to have a CPC. Then in the 60's it was considered good practice to gently twist the CPCs so that if the screw came loose in the connector you still had a good connection to earth. This was before we inspected everything to death and a test of ring continuity at the main board and a global IR test and you were good to go live plus a test for polarity if you were conscientious. A figure of eight was a knot not a test. Since then I have snapped any number of twisted CPCs  while trying to undo them to modify, fault find  or test circuits. Usually when they have been twisted back to the point of entry into an enclosure you know the break is going to occur where it enters so it is almost impossible to make a joint. If they have been twisted with a drill the chance of snapping is very high. Of course when they have been twisted they will al have been stuffed into one piece of green sleeving which is impossible to get off and it is impossible to get the twisted shape of the single wire into the G/Y sleeve you have with you and when you try to straighten it,  it snaps.
I agree with Z about the problem of putting multiple singe wires into a connector but a tug test on each one should find the loose one or two and then you can spend a happy hour or two trying to get them all in a configuration which allows the screw or cage clamp to grip on them all. A little twist at the end does solve this even though you know future electricians will probably curse you.

It's quiet in here isn't it, one could nod off quite easily.

Back in the olden days, before even my time, it was usual to twist  the shielded  CPCs of T&E outside the junction box with no other form of connection other than the odd blob of solder occasionally, often on top of the box it so it became impossible to open the box without the CPCs being untwisted. Of course it was quite common for lighting circuits not to have a CPC. Then in the 60's it was considered good practice to gently twist the CPCs so that if the screw came loose in the connector you still had a good connection to earth. This was before we inspected everything to death and a test of ring continuity at the main board and a global IR test and you were good to go live plus a test for polarity if you were conscientious. A figure of eight was a knot not a test. Since then I have snapped any number of twisted CPCs  while trying to undo them to modify, fault find  or test circuits. Usually when they have been twisted back to the point of entry into an enclosure you know the break is going to occur where it enters so it is almost impossible to make a joint. If they have been twisted with a drill the chance of snapping is very high. Of course when they have been twisted they will al have been stuffed into one piece of green sleeving which is impossible to get off and it is impossible to get the twisted shape of the single wire into the G/Y sleeve you have with you and when you try to straighten it,  it snaps.
I agree with Z about the problem of putting multiple singe wires into a connector but a tug test on each one should find the loose one or two and then you can spend a happy hour or two trying to get them all in a configuration which allows the screw or cage clamp to grip on them all. A little twist at the end does solve this even though you know future electricians will probably curse you.

It's quiet in here isn't it, one could nod off quite easily.