If you install a ceiling fan you're installing a fixed appliance which will be classed a fundamental alteration to the circuit. As such the circuit is then required to be made compliant by todays standard, not the standard it was installed to. I don't see this circuit being compliant unless it's completely rewired. See this thread for further opinions. https://www.theforumsa.co.za/forums/...l-installation

Also what about RCD requirements?