I understand from the manuals that Multiplus 3-phase networks must be Wye/Star, not delta. However, I should be able to run 3-phase delta loads from the legs of the star, since the line-line voltage would still be 400V. Such a concept is drawn below.
My question is, what to do with the neutrals? They much be connected for the Multis to reference each other, and they are grounded by the ground relay. As drawn, there is nowhere to place an RCD or ground fault interrupter.
What is the best way to power a 400V_LL, three-wire, three-phase load.