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The cable I am using is 4mm NYY 3 Core cable. I went to a few wholesalers who said that I would need 25mm PVC Glands and would be best with 25mm Conduit, as 20mm would be too tight on the glands and the conduit would be a pain to pull the cable through, would be better with the bigger conduit and glands.
I may have missed something here but why are you installing NYY in flexible conduit? That seems like a very weird design to me, what's the purpose of the conduit?