if a three phase board is fully populated what would be the common thing to do to create more space? Would you mount another board at the side and bring its feed from a 3 pole breaker in the old board?
Some boards can have vertical or horizontal linking kits which include not only the bolts/flange required, but also busbar extensions. This means the second board becomes part of the first, rather than being limited by the 63amp MCB you will typically install. On 250amp busbar boards, this is obviously desirable.
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