This question concerns the size of three-phase tails required for a particular installation. It has been answered by SELECT (Theme – Installation Tips):

Question: I wonder if you could tell me the following - I need to know the meter tail size for single insulated tails contained within metal trunking, for an 80kVA three-phase and neutral incoming supply?
Answer: From your information, you will have a load current of just under 110A/phase and, therefore, 35mm tails should suffice.
You would need to increase to 50mm tails if your design current is between 110 and 134 A/phase.
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