For 6mm2 T&E, I would very likely use different 20mm oval conduits, 1 for each of The 2 cables, but I'd guess you'd will need 32mm oval conduit it you actually desired to put each in one duration. Mini and Maxi trunking are two types of cable management programs that https://roundconduit46789.blogstival.com/51558848/how-much-you-need-to-expect-you-ll-pay-for-a-good-round-conduit