Hi, In a conversion of a property to flats, the 3 phase head is to be located in the communal entrance together with isolator switches. The consumer units will be located some distance away within each flat on each floor. Which cable should be used to connect the consumer unit to the isolator switch? If the unit was in clos proximity, I'd of used 25mm tails, but that's not practical here. My electrical wholesaler suggests I'd be ok with 16mm T&E as flats are only 1/2 bedroom unit. Or should I use 25mm armoured? Any advice appreciated. Thanks.