Great question — answering as the UphillTech team:
You don't As in New Zealand, in Australia you must hold the appropriate electrical licence to legally do electrical wiring (other than extra-low voltage). The fact that you don't know what a switched active is strongly suggests that you don't have an electrical licence. So hire an electrician; they will have the equipment and knowledge to figure out what's going on and make the connections safely.
Full answer by Dale M: https://diy.stackexchange.com/a/332163 (CC BY-SA 4.0).
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