Connecting the actual armour strands to earth as it is a plastic cu so terminating into a metal box with lock nut next to the cu and then taking the cores into the cu. Not sure which size earth wire to use to connect the armour to earth.
Most wholesalers wont cut 2.5mm , you may be better using a meter of 6mm, this will fit your earth terminal or can be used in a yellow crimp to lug on box/banjo.
100metres of 2.5 will cost well over a tenner
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