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Thanks AlecK, This is what I also thought, checking all the documentation I had and after many years of encountering situations just ike this. Just to clarify though, out of interest, the scenario proposed to me was open circuit earth on each appliance AND a fault phase to frame on each appliance so...

Greetings all, In a commercial three phase installation, there are often (almost always) single phase 10 A switched socket outlets (power points) on different phases (some on red, some on white and some on blue). It has recently been suggested to me that when a meeting room (office type of environme...