Yes sorry I meant that it's not a 3 phase load, rather 3 seperate single phase loads.
So red phase does geyser
Yellow does oven
Blue does microwave
Above is just examples as they don't pull 50A but it's just some theory im working with.
I guess if you say a 3 phase supply but the
Red cottage A.
yellow cottage B.
Blue cottage C.
Then if they all use the ovens and kettle at the same time that Neutral would have to carry all that but it's normally always sizes same as the phase
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