Ok an easy post to settle a discussion. I have posted two rough diagrams below. One shows a 3 phase motor connected directly to the supply through a 10Amp MCB for protection and a second single phase load connected via an MCB again. Now in theory if I was remove the 2nd MCB and connect the single phase load to one of the motor feed phases after the MCB - what impact would this have? One person says that it will cause an imbalance on motor and potentially damage it. It may also damage the motor during a surge as the MCB would not protect it properly. Other theory is that the motor will remain in balance due to Kirchhoff law, so the motor will still draw exactly the same current and the remainder of the current will go to the second load if connected. If the current on any phase exceeds 10A the MCB will trip and protect both device. Please note this is purely a theory based question, not a regulations one as these may differ from place to place.