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Does my house need safety switches, and how many?

The short answer

New and altered circuits must be protected by a residual current device under the national wiring rules, but what is required on an existing untouched home varies by state. Several now require them at sale or lease.

TradieAnswers editorial · written in-house and sourced to the authorities listed below

Checked against 4 published sources, listed in full at the end of this page. How we source this

A safety switch and a circuit breaker are not the same device and do not do the same job. A circuit breaker protects the wiring from overload. It stops a cable overheating and starting a fire. A safety switch, properly a residual current device, protects a person: it detects current leaking to earth, which is what happens when electricity finds a path through a body, and cuts power in well under a second.

A switchboard can be full of breakers and have no safety switch at all. That is common in Australian homes wired before the 1990s, and it is the single most consequential thing to check on an older switchboard.

What the rules require

The national wiring rules, AS/NZS 3000, require residual current protection on new and altered circuits. That means any circuit an electrician installs or modifies today gets it. What is far less uniform is the position for an existing home nobody has touched: several states now require safety switches when a property is sold or leased, and the detail of which circuits must be covered differs.1

Testing yours

  1. Find the devices on your switchboard with a TEST button, those are the safety switches.
  2. Press the test button. The switch should trip immediately and cut power to its circuits.
  3. Reset it. If it does not trip, or will not reset, have it looked at. A safety switch that fails its own test is providing no protection.
  4. Do this every three months. It takes under a minute and it is the only maintenance these devices need.

Who does this work

You need a licensed electrician

Because installing or altering residual current protection is work on the switchboard, which is licensed everywhere in Australia.

This is licensed work in every Australian state and territory. Check a licence in your state

Where are you?

Who regulates electrical in your state

Trade regulation in Australia is state law, so the body that answers this depends on where the work is. Pick yours.

New South Wales — NSW Fair Trading
Electrical work is licensed with no homeowner exemption. NSW publishes a plain-language page on what electricians may do and what you must not. How to check a licence in NSW
Victoria — Energy Safe Victoria
Electrical and gas safety regulation, and the register of licensed electrical workers. Separate from the building regulator. How to check a licence in VIC
Queensland — Electrical Safety Office, Workplace Health and Safety Queensland
Electrical licensing and safety sit outside the QBCC. Electrical work is licensed with no homeowner exemption. How to check a licence in QLD
Western Australia — Building and Energy
Electrical contractor licensing and electrical worker licensing, plus electrical safety regulation. How to check a licence in WA
South Australia — Consumer and Business Services
Electrical work also sits under the PGE licence classes rather than a separate electrical regulator. How to check a licence in SA
Tasmania — Consumer, Building and Occupational Services
Electricians are licensed under the Occupational Licensing Act 2005 and appear on the same register. How to check a licence in TAS
Australian Capital Territory — Access Canberra
Electricians and gas appliance workers are licensed under the same Act and appear on the same registers. How to check a licence in ACT
Northern Territory — NT WorkSafe
Electrical worker and contractor licensing sits with NT WorkSafe rather than either board. How to check a licence in NT

What to do now

  1. Open the switchboard cover and look for a test button. A breaker without one protects the wiring, not you.
  2. Press the test button on each device you find. It should trip immediately. If it does not, that device is not protecting anything.
  3. Count how many circuits are actually covered. Older boards often have one safety switch on the power points and nothing on the lights or the oven.
  4. If anything fails the test or is missing, get an electrician to quote on bringing the board up to current requirements.

Related questions

How can I tell a safety switch from a circuit breaker?
A safety switch has a test button on its face. A plain circuit breaker does not. Some modern devices combine both functions and are marked RCBO.

Sources

Every source below was fetched and its response recorded on the date shown. Where a government site blocks automated clients, that is noted rather than reported as a successful check.

  1. Standards Australia · Standards AustraliaChecked 2026-08-10 · responded 200 OK
  2. Electricians · NSW GovernmentChecked 2026-08-10 · responded 200 OK
  3. Energy Safe Victoria · Energy Safe VictoriaChecked 2026-08-10 · responded 200 OK
  4. Building and Energy · Department of Energy, Mines, Industry Regulation and Safety (WA)Checked 2026-08-10 · responded 200 OK

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