The EC must abide by the law when maintaining common property, it is that simple.
I would write to the EC stating that unlicensed electrical work is being carried out in the building, and that as they are aware of this and have condoned its practice, the buildings insurance is at risk. It is not just from potential electrical fires; shock, plant and equipment damage/failure, etc would all be void. You would also have a devil of a time trying to re-insure the building.
Additionally, point out that the insurance that covers office bearers would also be void as they acted outside the law. That will then ensure each of the EC could be personally liable for any costs, and, in the event of electrical shock resulting in injury or death, it could even be a criminal liability.
Ask to have this included in the next EC meeting to ensure that it is tabled, but I think that once the EC realises that they will liable you should see the issue stop 