I changed a couple of CU's recently stacked dual tarriffs as the existing were overcrowed with multiple circuits in single MCB's I decided to use two boards I brought the supply into a DP henly split the tails into 16mm2 and fed one board as a split. the off peak to one side 3 16A circuits and the rest of the day load to the other side by a supply from said henly all this is in a walk in store cupboard all cables are correctly erected clips, etc however I have looked in the BRB for a contradiction to what I have done as to the henly should it be in an enclosure or is a HB considered as double insulated
Pict
Pict