RCD Safety Switch - test and tag

Our latest series of FAQs are all about RCDs. Find out everything you need to know about RCDs now and get in touch with our team if you have any questions.

At Jim’s Test & Tag, we offer RCD testing services to businesses across Australia. Contact us now for a FREE QUOTE on any of our electrical and fire safety inspection services.

What does RCD stand for?

Residual current device. An RCD is also known as a safety switch.

Residual current devices are a type of circuit protection that prevents electrocution and minimises some chance of electrical fires.

Are RCDs mandatory?

The legislation regarding RCDs in Australia varies from state to state. In commercial environments, a functional RCD is essential. As a business owner or operator, you are legally obligated to provide a safe working environment for your employees and guests. For more information about your requirements, contact us today.

What is the difference between a safety switch and a circuit breaker?

Safety switch:

  • protects people from electrical shock
  • detects and interrupts a ground fault

Circuit breaker:

  • protects electrical wiring and systems in your home
  • detects circuit overload (short circuit)
  • detects a high current fault

What causes an RCD to trip?

There are a number of reasons why a safety switch trips. Most times, it is because of a faulty appliance. It can also trip when a person comes into contact with a live electrical current as a protection against electrical shock.

Who can test RCDS?

Your safety switch needs to be tested and tagged by a qualified professional. This will ensure that your circuit protection is as safe as possible. Only trained technicians operate according to the national standards for electrical safety testing.

Residual current devices need to be tested according to the AS/NZS 3760:2010 standard for the in-service safety inspection and testing of electrical equipment. It is a requirement that you receive a log book of results after the testing is complete. If you do not receive this report, it is a sign that your technician is not sufficiently qualified.

To avoid inaccurate work, call Jim’s Test & Tag. We are a team of highly qualified safety professionals who are dedicated to serving the community. We will test and inspect your device according to the current standard and adhere to all the requirements – including accurate reporting and re-testing intervals.

How to reset an RCD

If your residual current device has recently interrupted your power supply, you can easily reset it and move on with your day. If your RCD is located on a switchboard, go to it and open the panel. Find the toggle switch that has moved to an off position (this will usually have an RCD label) and move it back into the on position. This will reset your RCD. Some companies/body corporate groups have internal policies on who can access the switchboard – check the policies in your building before rushing in.

If your safety switch keeps moving back into the off position, it’s a sign that there may be a damaged appliance tripping the system. You can resolve this will our appliance testing services.

What RCD do I need for underfloor heating?

Because of the extra electricity required to pass through an underfloor heating system, it is recommended that you install a 30mA residual current device. This may vary depending on your system, so always check the manufacturer recommendations and install all the recommended safety equipment.

What RCD do I need for a shower?

Always refer to the manufacturer’s instructions when installing an electric shower. Each system will include a specific recommendation for that shower. It is worth consulting with the Australian Building Codes Board and checking the standard requirements for electrical shower installations.


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