Protection by RCD’s Clause 2.6 Additional protection by RCD’s The RCD must suit the type of circuit and waveform in use. There are four types of RCD, although most of us only use one of them, the “Type AC”. Note that many inverters require the use of “Type B” RCD as a result of the wave form. Use of the wrong RCD with an inverter may cause instantaneous tripping or total failure of tripping. Where RCDs are required the circuits shall be arranged as follows: a) Not more than 3 final sub‐circuits shall be protected by any one RCD; and b) Where: i.
the number of RCDs exceeds 1; and ii.
more than 1 lighting circuit is installed….then the lighting circuits shall be distributed between the RCDs. c) In domestic installations having more than 1 final sub‐circuit, a minimum of 2 RCDs shall be installed. Clause 2.6.3.1 Residential Installations RCDs are required for socket outlets and lighting circuits in residential electrical installations. And also for— a) One or more socket outlets b) Lighting outlets (inc combined light, heat and fan units) c) directly connected hand‐held electrical equipment forming part of – i.
individual domestic installations; or ii.
residential areas of other electrical installations (motels, hospitals etc); or iii.
multiple residential electrical installations that are provided for common use; Exceptions: Clause: 2.6.3.3 Home dialysis installations In accordance with AS/NZS 3003 medical equipment used in home dialysis installations shall be: a) supplied by a dedicated circuit; and b) protected by a 10mA RCD positioned so that it may be reset by the patient while under treatment. Clause: 2.6.3.2 Other electrical installations Additional protection by 30mA RCDs shall be provided for final sub circuits supplying — a) socket outlets having a rated current not exceeding 20A; and b) one or more lighting points and having a rated current not exceeding 20A; and c) directly connected hand‐held electrical equipment. Note: The final sub circuits referred to in Item (b) above include, without limitation, those supplying the following: a) External lighting installations, such as bollard‐type luminaires; and b) Illuminated signs; and c) Ground mounted lighting for the illumination of public features. Exception: Where disconnection could cause a dangerous situation. E.g. Traffic lights. Clause: 2.6.3.4 Alterations, additions and repairs Socket outlets added to an existing circuit shall be protected by an RCD. Exception: a) Where socket outlets or lighting points are not RCD protected are replaced, including the replacement of a single outlet with a multiple. b) Extensions to circuits supplying lighting points only, provided the existing circuit is not RCD protected If you would like further information contact the Master Electricians Technical
Hotline on 1300 889 198.