AS 3000
1.5.5.3 Protection by automatic disconnection of supply
The following applies:
(a) Automatic disconnection of supply is intended to limit the prospective
touch voltage arising between simultaneously accessible conductive
parts in the event of a fault between a live part and exposed
conductive parts or a protective earthing conductor.
This method of protection shall be achieved by—
(i) provision of a system of equipotential bonding in which exposed
conductive parts are connected to a protective earthing
conductor; and
(ii) disconnection of the fault by a protective device.
NOTES:
1 Automatic disconnection of supply may also be required for protection
against overcurrents, in accordance with Clause 1.5.9 and Clause 2.5.
2 Clause 5.6 contains requirements for equipotential bonding.
3 Section 2 contains requirements for the disconnection of a fault by a
protective device.
1.5.6 Additional protection by the use of RCDs
1.5.6.2 Fault protection
RCDs are recognized as a means of providing automatic disconnection of
supply in accordance with Clause 1.5.5.3.
1.5.6.3 Where required
RCDs for the limitation of earth leakage current shall be capable of
interrupting the part of the circuit protected by the RCD when an earth
leakage current reaches a predetermined value.
RCDs shall be installed for additional protection of the following:
(a) Circuits, socket-outlets, lighting points and hand-held equipment, as
specified in Part 2, Clause 2.6.
(b) Wiring systems, as specified in Part 2, Clause 3.9.4.4.
(c) Electric heating cables, as specified in Part 2, Clause 4.10.5.
(d) Electrical equipment, including socket-outlets, installed in damp
situations, as specified in Part 2, Section 6.
(e) Specific electrical installations, as specified in AS/NZS 3001,
AS/NZS 3002, AS/NZS 3003, AS/NZS 3004, AS/NZS 3012 and
AS/NZS 4249.