What a safety switch does
NSW Fair Trading notes that safety switches “are also known as residual current devices or RCDs.” Queensland’s Electrical Safety Office describes the job: “They shut off electricity supply when current leakage is detected. This avoids serious electric shock and possible electric burns by stopping the current flowing through a person.”
The same office separates them from the switches beside them: “Circuit breakers and fuses do not protect people directly, only safety switches save lives.” Energy Safe Victoria describes the two as working together: safety switches “are an additional form of protection to be used with circuit breakers and fuses.”
What it cannot promise
Each regulator sets limits on what a safety switch can do. Queensland says one “will turn off the power in a fraction of a second if a leakage of current to ‘earth’ is detected”, but that “there may be instances where it doesn’t operate if a person is not earthed.” NSW Fair Trading says their use “can enhance electrical safety but they do NOT remove the need to observe safe electrical practices and properly maintain equipment.”
How to tell whether you have one
Queensland’s answer: “Safety switches have a ‘T’ or ‘test’ button on the front face. If the devices in your switch board do not have a test function, they are probably circuit breakers not safety switches.” Its film adds that the test buttons “can be blue, white, black or orange and they range in size and shape.” Energy Safe Victoria says they “are also sometimes labelled with the words ‘safety switch’”, and that if you are unsure whether one is installed, the person to ask is a registered electrical contractor. The test button guide covers the test itself.
Not every safety switch sits on the switchboard
Western Australia’s Building and Energy lists the forms they come in:
- Combination RCD“A combined circuit-breaker and RCD”, which the regulator suggests for meter boxes with “little or no spare space”.
- Portable RCDThese fit onto a power board or extension lead, protecting you while you use power tools or electrical appliances outdoors.
- Power point RCDRecognisable by a test button on the power point’s face plate, and intended to protect appliances in bathrooms and workshops.
NSW Fair Trading’s view of the first two: “Fixed safety switches offer the best protection but portable safety switches are also useful when working away from home.”
One may not be enough
A safety switch protects only the circuits wired through it. Queensland’s campaign line is “One safety switch may not be enough”, and its advice is that “You should consider having safety switches installed on all circuits in your home, including power points, lights, air conditioning, oven, hot water and pool equipment circuits, even if they are on a separate tariff.”
Western Australia puts a number on it: at least two are required, and more than two may be needed.
When the law asks for one, state by state
Queensland’s Electrical Safety Office describes how its state compares: “Queensland also has a range of additional legislative requirements such as requiring safety switches to be installed on ‘power point’ circuits in homes when they are sold and on domestic rental properties.” Each row below comes from that state’s own regulator.
| State | When | What the regulator says |
|---|---|---|
| Queensland | New homes | Safety switches “have been compulsory on all general-purpose socket-outlets (power point circuits) in new homes in Queensland since 1992”, and “on all power point and lighting circuits for new Queensland homes built since 2000”. |
| Queensland | Buying | “If you buy a property without a safety switch, you must install a safety switch for the power point circuits within 90 days of a property transfer.” |
| Queensland | Selling | Whether a safety switch is installed for power point circuits “must be declared on the standard sales contract and Form 24 Property Transfer.” |
| Queensland | Renting | A landlord “must ensure approved safety switches are installed for all power point circuits within 90 days after the residential tenancy agreement’s start date.” The regulator says a landlord without one “may receive a fine of up to $1,500” (as at October 2026). |
| Western Australia | Selling | Before the land title is transferred, RCDs must be properly installed, protecting every circuit that supplies power points and lights. |
| Western Australia | Renting | Landlords must make sure their rental premises have RCDs installed in the switchboard, as the Electricity Regulations require. For short-term rental accommodation, they must be installed “before guests stay in the premises.” |
| Victoria | Renting | Energy Safe Victoria’s page for renters says electrical and gas safety checks “must be done every 2 years”, by a licensed or registered electrician or gasfitter, and states: “All switchboards must have RCDs fitted.” |
| Victoria | Buying an older home | Advice: wiring check. “When buying a home built before the 1980s it is imperative the wiring is checked by a licensed electrical inspector or registered electrical contractor prior to moving in.” |
| New South Wales | Older homes | NSW Fair Trading’s safety page gives advice rather than a deadline: “If your house was built before 1977 it is unlikely to have an earth rod and you should seriously consider having a safety switch installed.” |
| New South Wales | Renting | Renters are told to report electrical problems to the landlord or managing agent “immediately”, as “landlords have a legal obligation to ensure all electrical installations and fittings on their property are kept in safe order.” |
South Australia, Tasmania, the ACT and the Northern Territory set their own rules through their own regulators; ERAC keeps a list of its member regulators (its list may show older names).
Who may install one
Queensland: “Only a licensed electrician can install a safety switch. DIY electrical work is dangerous and illegal.” Western Australia: to install RCDs, or to fix a problem a test turns up, you must engage a licensed electrical contractor. Who may do the work, and the paperwork that follows, are set state by state, on pages such as NSW electrical licences and Victoria’s Certificates of Electrical Safety.