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Hi, I have a number of light industrial units on one site, one unit is very large and difficult to let, so we have split it and created a smaller 2500 sq ft unit. We now need to run a new supply to it and fit a new consumer unit, we normally fit 3 phase boards with room for a 16 amp and 32 amp breaker, as most of the end users are small businesses without a massive need for big electricity supplies. All our units are sub metered from our incoming supply, so my question is what size of cable do I need to install, the rest of the units seem to be in 4 core 10mm and 4 core 16mm, the distance from the sub meter to the consumer unit is about 30m. Thanks in advance