So if one end, I'll get one core and touch it to the inner copper/cpc then go other end and test between the inner copper/cpc and the cores till it bells?
If I have a helper I use a pair of GPO 704B linesmans 'phones, much more fun and saves running about, especially if the cable is long or in a different room. You can also tell the other bloke what to mark the conductor as.
connect a diode across the 2 cores at one end. then use your meter at the other. that will prove continuity and also polarity. then IR test the cores to the sheath.
I got a telling off on here once for using the term " belling out"
It's a term I've always heard used, but got put in my place big time for using it here.
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