The CTTT’s processes are far too ad-hoc, and consequently the outcomes they produce are unpredictable – so I’d avoid them like to proverbial plague, and I certainly wouldn't antagonise your EC and breach Strata Laws by making unauthorised additions to the Common Property (CP).
I can’t imagine how a transformer and conduit would be particularly disruptive to the use of your garage, or even to the aesthetics of your Lot, and whilst that’s for you to determine, your EC needs to concurrently consider the ongoing responsibility for maintenance / replacement of the transformer, cabling, and conduit and agreed access arrangements to your Lot for that purpose.
So I’d turn the whole thing around by writing to the Secretary of your EC with a request for the matter of the placement of CP on your Lot, together with the agreed process for the installation of and the maintenance access for that CP and for that already installed on your Lot, to be placed on the Agenda for the EGM – together with your item regarding those CP alterations.
You may wish to draft those Agenda Items yourself.
In that way, if there’s no EGM nothing is resolved, and as significantly, you’'re not displaying the same “forceful” behaviour as your EC, and rather, just following the correct discussion and decision-making procedures for such matters in a Strata Community.