Many people have heard of the term “RCD safety switch,” but few understand exactly what these life-saving devices are or what they do.
In today’s article, we want to help you learn about what to look for and how to test an RCD safety switch. Of course, if you don’t have time to inspect or test this yourself, you can always call Amp Electrical Perth for an inspection.
What an RCD Safety Switch Does and How it Protects You

RCD stands for residual current devices. It refers to electrical safety switches, which are your first line of defence against electrocution and fires caused by faulty electrical systems.
An RCD safety switch monitors the electrical current flowing through a circuit. If it detects overloaded circuits, electrical faults, or an imbalance, it cuts off the power to those circuits.
A fault usually means that, for whatever reason, whether it’s a faulty appliance, a faulty wiring, or a person has come into contact with a live wire, the switch will cut off the electricity supply in milliseconds.
It’s easy to see why Australian regulations now mandate these. This simple device can and does save lives!
Why RCD Safety Switches Matter in Western Australian Homes
As mentioned earlier, an RCD switch can save lives by detecting abnormalities in the current within a specified circuit.
For example, if you drop your radio into the bathtub while you’re in it, the RCD trips and cuts off the current to the radio to keep you safe.
When RCD safety switches work properly, they add an extra layer of protection for everyone in your home.
Simple Steps for Testing the RCD Safety Switch in Your Home

So you see how RCDs are silent life-savers at home, but what happens if your RCD fails? Most homeowners are unaware that these switches are installed inside their meter box, so it’s no wonder they never perform RCD testing.
To make sure that you don’t have faulty RCD switches, you can do a simple test with the following steps:
- Turn off as many appliances as you can, especially computers, since you will be cutting the power when you do the test.
- Locate the safety switch(es). You should see these labeled with a ‘test’ button.
- Press the test button firmly for one second.
- The switch should move to the off position.
- Check that power has been disconnected.
- Turn the switch back on to restore power.
- Check that power has been restored.
To ensure that your RCD functions properly, you need to do this test every 3-4 months.
If you don’t feel comfortable doing these tests, you should have a licensed, qualified electrician perform the tests for you.
Signs Your RCD Safety Switch May Be Faulty or Failing

Here are sure-fire signs that your safety switch is not operating correctly:
- The switch does not turn off when you press the test button.
- Or, the switch will not turn back on.
- You notice frequent nuisance tripping (electrical circuits tripping for no apparent reason).
- The switch trips off when you press the test button, but it does not cut electricity to the power points.
- The RCDs trip even when no appliance is being used.
When you are in front of the switchboard and you notice a burning smell, or if it feels very warm, you should contact a licensed professional electrician ASAP.
Common RCD Safety Switch Myths that Put Perth Homes at Risk
Here are the top 5 most common myths about safety switches:
- If the switch hasn’t been tripped, then everything is fine.
- Circuit breakers and RCDs are the same thing.
- Older homes don’t need RCDs; they have circuit breakers to protect against overloading and short circuits.
- RCDs don’t need testing.
- Once an RCD is installed, it never wears out (or goes bad or needs replacing).
None of the above is true.
When to Call a Licensed Electrician in Perth
If your RCD switches fail a safety test or you have any questions or doubts about them, you should immediately contact a licensed electrician for professional testing. Never attempt any DIY repairs to prevent further damage and to keep your family safe.
Electric shock can happen from power points or faulty circuits if the RCD switch is not working properly.
This is especially true if you have an older Perth home. Many switchboards are outdated and can lead to electrical fires, electrical hazards, and even loss of life.
RCD Testing, Safety Checks, and Compliance Tips for WA Properties

We recommend RCD testing every 3 to 4 months. This is also the perfect time to inspect your main switchboard for any hidden faults, damage, loose connections, or signs of excessive wear, such as discolouration or buzzing noises.
Keeping your home in compliance with current Australian Standards requires regular testing of your RCD switches, power points, and circuit breakers.
Keep in mind that all repairs must be carried out by a licensed electrician.
Getting certified that your home’s electrical wiring has been regularly inspected or repaired and that it is in full compliance gives you peace of mind. It will also pay off tremendously when you go to sell your home or have an inspection from insurance companies.
Call Amp Electrical Perth: NEVER a Call-Out Fee
Testing RCD safety switches is a simple yet vital step to protect people and keep the house itself free from electrical faults.
If you feel uncomfortable testing the electrical safety of your switches, have questions about the process, or want the peace of mind that comes from a full inspection, call our experts today.
We are a local, family-owned business offering inspections, testing, and free quotes. Oh yes, we also NEVER charge a call-out fee.
What are you waiting for? Call the licensed professional electricians at Amp Electrical Perth today for clear, honest guidance and information.