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No I have had a quote of an electrician , He gave me a load of information and I just thought I would check it. He hasn't bought the cable yet I just wanted to make shore as the quotation isn't the cheapest and he seems very young. 

I have a 4 core 25mm SWA, running at a length of 110 meters, clipped direct to the wall on its own, needed for a 3 phase 400v supply. Is it true that I would need to run a separate 16mm earth with it. Also what size main breaker would you suggest i think 80amp. any help on this would be much...