In non-residential installations, all final sub-circuits, up to and including 32A, multi-phase and lighting, are to be 30mA RCD protected. There are however two scenarios to this requirement.
If the electrical equipment is fixed wired direct in that installation, meaning that it cannot be moved unless by skilled persons (wiring disconnection), the requirement for an RCD is a consideration only.
If the electrical equipment is plug and socket connected in that installation, meaning that it can be unplugged and moved by unskilled persons (inadvertent damage to the equipment and insulation may occur, as well as unsafe equipment being plugged into the socket), the requirement for an RCD is a mandatory one.
There are several exceptions to the non-residential installations that exist already but a new one has been added. If the owner/operator deems that a piece of electrical equipment must not be exposed to nuisance tripping, as it may cause economic or personnel disruption for example, then the RCD can be left off the final sub-circuit.
As with any of these exceptions it is required to have over-current protection at the switchboard, mechanical protection of the cable, wiring connection marked to state that RCD protection is not provided.
Home-care medical installations are now referred to AS/NZS 3003 Electrical Installations – Patient Areas rather than duplicate information between both installation standards.