I was hoping someone could clarify this for me. I have two consumer units. From the meter, 16mm tails go to an isolation switch and then to a Henley block that divides to one consumer unit close to the metre and one eleven metres away, again with 16mm cable. Both consumer units have a 100amp switch. I understand that the tails should be 25mm. For the second unit, am I correct in thinking that either the cable should be armoured (and presumably 25mm) or unarmoured but with a time delayed rcd? Also there is an isolation switch after the meter before the Henley blocks, do I need a second isolation switch after the tails divide for the second consumer unit? I ask because I have had conflicting advice from different electricians and I want the set up to be safe but not "over engineered" as it were.