kiwi,
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As for the mechanical strength of the twisted wires, if you don't nick or mash the copper with your pliers its all good.
That's the big thing about wire preparation, there have been arguments here, over in the US Area about stripping wires and nicking the copper strands.
It seems to get worse with flexible cords too, with more strands that can be damaged at once.
However, if you are careful and keep you eyes on what you are doing, it's a cinch to strip wires properly. [Linked Image]