Does Acme provide “Zig-Zag” Grounding Transformers?

Yes. Please refer below for a special diagram which can be used to connect standard single phase off-the-shelf transformers in a three phase zig-zag manner. This system can be used for either grounding or developing a fourth wire from a three phase neutral.

An example would be to change a 480 V — three phase — three wire system to a 480Y/277 V — three phase — four wire system.