back in post #2 PeterC said….”usually, there is no obligation to upgrade anything to current building standards if maintenance or repair is not needed. IE if something still meets the standard that it met when installed you don’t need to do anything. If you were to do new work, the new work would have to meet current standards.”
Peter’s correct, and even though the original electrical wiring is in the common property (ceiling) and is therefore the responsibility of the Owners Corporation (O/C), it doesn’t need to be compliant with current Building Codes provided it doesn’t present a hazard in its as-built form.
Of course the new owners of the lot may at their discretion seek the O/C’s consent to themselves alter any wiring for which it (the O/C) would otherwise be responsible, including within a roof-void or a common (perimeter) wall, where such consent would be routinely granted provided the lot owners engage properly licensed and insured tradespeople, and agree in writing to accept responsibility for the on-going maintenance and repair of all altered / renewed sections.
If I’m any judge, the new owners won’t be so keen to achieve compliance with current Building Codes if they have to pay for that!