The supply company feeds a meter, then it goes to the 1st board which feeds 4 sub boards, there is a meter before each sub board. The 4 sub boards are protected by 63A 3 pole CB's.
I did suggest that kit to the customer before I started. He said he wanted to use the meter he already had.
What does CCC stand for, I do not know what the abbreviations you lot use. Is it Cable Capacity Chart?
This is a secondary board. This is a private meter just for this building. Mains supply branches off to 5 buildings, each with a private meter so the landlord can meter each building separately
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