If your Residual Current Device (RCD) keeps tripping, it can be frustrating — especially if it happens in the middle of making a cup of tea or watching TV. But in the UK, RCDs are an essential safety device, designed to protect you from electric shocks and prevent electrical fires. Frequent tripping usually means there’s a fault that needs attention.

In this blog, we’ll explain why RCDs trip and how you can fix the issue safely.

What is an RCD?

An RCD (Residual Current Device) is a life-saving device that quickly cuts off electricity if it detects a leakage of current — for example, if electricity is flowing through an unintended path, such as a person or faulty wiring. It reacts in milliseconds, reducing the risk of injury.

Common Causes of RCD Tripping

1. Faulty Appliances
   A damaged kettle, washing machine, or even a phone charger can leak electricity, causing the RCD to trip.
   Tip: Unplug all appliances, then plug them in one at a time to find the culprit.
2. Moisture in Wiring or Sockets
   Dampness in outdoor sockets, garden lights, or bathroom circuits can cause leakage.
   Tip: Check for signs of water ingress and get a qualified electrician to fix it.
3. Overloaded Circuits
   Too many high-powered devices on one circuit can trigger the RCD.
   Tip: Spread your devices across different sockets and circuits.
4. Wiring Faults
   Damaged cables, loose connections, or deterioration over time can cause leaks in current flow.
   Tip: Only an electrician should inspect and repair wiring issues.
5. Defective RCD
   Sometimes the RCD itself can be faulty and trip without reason.
   Tip: A certified electrician can test and replace the device if necessary.

How to Fix Frequent RCD Tripping

• Reset the RCD by switching it back on. If it trips immediately, there’s likely a serious fault.
• Isolate the fault by unplugging all devices and switching off circuits before turning the RCD on again.
• Call a qualified electrician if you can’t identify the problem.

When to Call a Professional

If your RCD trips often without a clear cause, it’s essential to contact a Part P registered or NICEIC-certified electrician. They have the tools to test your circuits safely and ensure your home meets UK electrical safety standards.

Final Thoughts

An RCD tripping is annoying, but it’s also a sign that your home’s electrical system is doing its job — keeping you safe. Ignoring the problem can lead to dangerous situations, so always address the cause promptly.