Comment by fgfarben
4 days ago
Ferrules often have insulating shells around the base which are good strain relief.
Ferrules also evenly distribute the clamping force and prevent crushing of the strands.
Ferrules solve the problem of having to align the threads every time you re-post them in a terminal block.
I wonder if crushing is more of a phenomenon when you have a lever you're encouraged to push down to a flush position, rather than a screw you tighten and have tactile feedback regarding the difficult of tightening further.