RCD safety switches: what Perth homeowners need to know
An RCD, or residual current device, is designed to disconnect electricity quickly when it detects current leaking from a circuit. It has a different job from a fuse or ordinary circuit breaker.
RCDs, circuit breakers and fuses are not the same
Fuses and circuit breakers protect wiring against overloads and short circuits. RCDs are designed to reduce the risk of electric shock by responding to leakage current. Some modern devices combine RCD and circuit-breaker functions, but the labels and configuration vary between switchboards.
What are the WA rules when selling a home?
WA Government guidance says that, before the land title is transferred, at least two RCDs must be properly installed to protect all circuits supplying power points and lights. Owners should arrange an inspection with enough time to complete required work before settlement rather than relying on a visual check.
What should landlords check?
Rental properties also have RCD requirements. Because obligations can depend on the property and tenancy circumstances, owners and property managers should use current WA Government guidance and obtain advice from a licensed electrical contractor instead of relying on an old inspection report.
How often should the test button be used?
WA Government guidance recommends testing as stated in the manufacturer’s instructions or every three months, whichever is more frequent. If the switch does not move to the OFF position immediately, or will not remain ON after reset, contact a licensed electrical contractor.
How to perform the user test
- Tell everyone in the property that power may be interrupted.
- Shut down sensitive equipment where appropriate.
- Only open the meter box if it is in good condition and safe to approach.
- Identify the RCD test button, usually marked with a “T”.
- Press the button and confirm the device switches off immediately.
- Reset it. If operation is abnormal, leave it to a licensed electrician.
The test button confirms the device operates mechanically; it is not a substitute for professional testing of the switchboard, circuits or earthing.
When to arrange an electrician
- An RCD will not trip during a user test or will not reset.
- A device trips repeatedly and the cause is unknown.
- The switchboard has exposed damage, heat marks or missing labels.
- You are selling, renting or renovating the property.
- You are unsure whether every required power and lighting circuit is protected.
Official reference: WA Government: RCD safety switches.
