RCD & Safety Switch Installation Perth

RCD & Safety Switch FAQs

• What is an RCD or safety switch?

  An RCD (residual current device) monitors the balance of electrical current in a circuit and disconnects the supply when it detects leakage. It provides additional protection against electric shock. “Safety switch” is the common name for an RCD.

• Is an RCD the same as a circuit breaker?

  No. A conventional circuit breaker protects wiring against overloads and short circuits. An RCD detects current leakage and adds protection against electric shock. An RCBO combines both functions in one device.

• How many RCDs does a WA home need?

  For a WA home being sold or rented, the regulations require at least two RCDs protecting socket-outlet and lighting circuits. No more than three final subcircuits may be protected by one RCD. Where there are two or more lighting circuits, they must be distributed across RCDs. The right arrangement depends on the installation, so the number of switches alone doesn’t confirm compliance.

• Do all circuits need RCD protection?

  WA guidance states that residential installations constructed after 1 January 2019 require RCD protection on all final subcircuits under the Wiring Rules. Older homes are not automatically required to upgrade every circuit solely because this requirement changed. New circuits and alterations can trigger current requirements for the work involved.

• Does an older house need every circuit upgraded?

  Not automatically. We assess the existing protection, whether the property is being sold or rented and any new electrical work proposed. We explain the required work separately from recommended or optional improvements.

• Do I need RCDs before selling my home?

  Yes. The required RCD protection must be installed before the title transfers. We can assess the devices and circuit distribution, test the protection and arrange the necessary work before settlement.

• Are RCDs required in rental properties?

  Yes. WA landlords must ensure the required RCD protection is installed and maintained. We assist landlords and property managers with inspections, testing, identified defects and repairs, including work across multiple properties.

• What is an RCBO?

  An RCBO combines residual-current protection with overload and short-circuit protection in a single device. It is commonly used to provide both types of protection for an individual circuit.

• Are individual RCBOs better than a shared RCD?

  Individual RCBOs can help keep a fault on one circuit from switching off unrelated circuits. They can also make fault finding more straightforward. We assess the existing board, circuit arrangement and your priorities before recommending an option.

• What is a Type A RCD?

  Type A RCDs detect alternating current leakage and pulsating DC leakage. Suitable RCD types depend on the connected equipment and application. Type AC RCDs have been prohibited for new applicable installations in WA since 1 May 2023; Type A, F or B may be needed depending on the work.

• Do existing Type AC RCDs need immediate replacement?

  Not solely because they are Type AC. WA guidance says existing Type AC RCDs permanently installed, tested and certified before 1 May 2023 do not have to be replaced just because the rules changed. A faulty device, new work or the equipment connected may still require assessment and a suitable replacement.

• How often should I test my safety switches?

  Follow the manufacturer’s instructions or test every three months, whichever is more frequent. Use the test button only if you are confident doing so and the meter box is in good condition. Professional inspection and testing may also be needed, especially where the testing history is unknown or a fault is suspected.

• What should happen when I press the test button?

  The RCD should switch off immediately when you press the button marked T or TEST. If it doesn’t, or it won’t remain on afterwards, contact a licensed electrical contractor. Don’t force it. The test button checks part of the device’s operation; it does not replace professional testing of the installation.

• Why won’t my safety switch reset?

  Possible causes include a faulty appliance, damaged wiring, moisture, excessive leakage or a faulty RCD. Don’t repeatedly reset or force it on. We can investigate the cause, test the circuit and recommend the appropriate repair.

• Why does my RCD trip when it rains?

  Moisture may be affecting outdoor equipment, fittings or wiring. Rain-related tripping needs fault finding to locate the problem. Replacing the safety switch without checking the installation may leave the underlying fault unresolved.

• Can a faulty appliance trip an RCD?

  Yes. Current leakage from an appliance can trip the RCD protecting its circuit. Several devices can also contribute small amounts of leakage that add up. We can help identify whether the issue is an appliance, the wiring or the protective device.

• Can RCDs be added to my existing switchboard?

  Often they can, but it depends on the board’s condition, capacity, available space and wiring arrangement. We assess these first and explain any associated work needed for a suitable installation.

• Will I need a full switchboard upgrade?

  Not necessarily. A full upgrade may be appropriate if the board is damaged, outdated, crowded or unsuitable for the required protection. Where the existing board can accommodate the work, a more limited installation may be possible.

• Can you test and install RCDs at commercial properties?

  Yes. We work on commercial RCD and RCBO installations, testing, fault finding, maintenance and fitouts. Workplace requirements differ from residential sale and rental rules, so we assess the premises, equipment and applicable requirements.

• Will I receive an electrical safety certificate?

  For electrical installing work that requires an Electrical Safety Certificate, we provide the applicable certificate. WA guidance requires it within 28 days of completion. Maintenance and like-for-like repairs can be treated differently, so we’ll explain the documentation relevant to your job.