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Oh right, I had originally connected as in the picture with only the output side neutral connected to the star point, powered it up and all seemed fine. But after I left site, I started second guessing whether the input side neutral would be needed to carry back any unbalanced loads and keep the sta...

I'm connecting three phase step down auto transformer. 400V input and 230V output. It's to supply a piece of equipment brought over from America and the load won't be balanced.

My question is the star point common for the line and load side of the neutral. I'm not 100% sure on this one.

Cheers