Master Electricians

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Protection by RCD’s
Clause 2.6 Additional protection by RCD’s
An RCD, or residual current device, is a life-saving device which is designed to prevent you from getting a fatal electric shock if you touch something live. 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)
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 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;
Clause: 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.