You can either use notches in the insulation when you install the cable or use a permanent marker pen to put stripes on the cable i.e. put 1 stripe on each end of sw live, when using strappers you may end up with two or three stripes/notches. If using notches when you terminate them cut them back far enough to remove the notches!!
If you need to ID an installed cable then you can do it by attaching it to earth at one end and continuity checking it against earth at the other. Remember to check all wires to earth though in case there is one with damaged insulation.
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