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Residual Current Device
Responsible agency
Department of Mines, Industry Regulation and Safety

Residual Current Devices (RCDs) monitor the flow of electricity from the main switchboard and prevent electrocution by cutting the electricity supply if an imbalance in the current is detected. Two RCDs must be fitted before land title is transferred.


By installing two RCDs, the property’s circuits can be divided evenly between the two. This ensures some light and power remain if one RCD operates and also minimises faulty operation from appliances which have low-level leakage current.

From 9 August 2009, two RCDs must be fitted to protect all power point and lighting circuits in all homes before the land title is transferred. If you are planning to sell your home and it does not already have two RCDs protecting all power point and lighting circuits, you will need to engage a licensed electrical contractor to fit two RCDs to the main switchboard or distribution board.

Landlords must arrange for two RCDs to be installed on the switchboard at their rental premises before a new tenant takes up occupancy or before August 2011 for continuing tenancies. If RCDs are not fitted at the time that a new lease is entered into, tenants should contact the managing agent or landlord and request that two RCDs be installed.

Electrical inspectors will monitor homes sold or leased for compliance. Penalties of up to $15,000 for individuals and up to $100,000 for a body corporate may apply if the regulations are breached.

For more information see or call (08) 9422 5200.

Date updated
05/07/2017 18:44:16