MC Step Up Transformer Wiring

[Crumb]

Hi;

I am in the process of building an MC step up transformer. I am
somewhat confused about the wiring though. I have been reading that to
prevent ground loops, the input and output jacks(ground connections)
should be isolated from the metal chassis. That seems fair. But what
has me confused is that the chassis nearly always has a binding post
for grounding.

I have noticed that some transformers have a shield wire and
manufacturers recommend connecting it to the binding post(ground) but
this seems to defeat the chassis/box as a shielding enclosure.

But what about transformers without this available shield wire? Having
a ground connection which connects to a metal box that is not
connected to the internal components seems to not accomplish anything.
Am I missing something here?

Thanks