RCD's shall be fixed setting RCD's complying with AS/NZS 3190, AS/NZS 610081.1, AS/NZS 61009.1, or IEC 62423 and intended for use in electrical installations.

An RCD detects fault currents flowing to earth that are too small to trip over-current protection devices (such as circuit breakers or fuses), but are still sufficient to cause a dangerous electric shock (see also figure attached) or an electrical fire. Verifying their operation is critical for safety, and is covered in IEC 60364 (and its various national equivalent standards). This standard specifies the requirements for fixed electrical installations in buildings.