Have you ever been in the middle of a chore only for the lights to go out suddenly? Or flicked on a switch expecting light, but got darkness? If this sounds familiar, you’ve likely experienced the mystery and frustration of an RCD tripping – something our NICEIC-accredited electricians get asked about by homeowners across Exeter and Devon all the time. It might seem like your electrical system has a mind of its own, but an RCD tripping actually serves a critical safety purpose in your home.
What Is RCD Tripping and Why Should I Care?
RCD stands for Residual Current Device. This device is a super-sensitive safety guard that constantly monitors the electricity flowing through your circuits. It can detect even tiny imbalances in the electrical current. These imbalances are often undetectable to humans but could cause serious harm.
Imagine electricity as a river, flowing from the source to your appliances and back. An RCD trip is like a dam that instantly springs up if some of the water starts to leak out of the riverbed.
This “leakage” is often a sign of a fault. Perhaps a faulty appliance, damaged wiring, or even water creeping into an electrical component. If left unchecked, these faults could lead to electric shock or even a fire.
How an RCD Saves the Day
When the RCD senses a problem, such as electricity flowing where it shouldn’t, it acts with lightning speed. It cuts off the electrical supply in milliseconds, far faster than a fuse could. This swift action prevents serious electric shocks and reduces the risk of electrical fires.
Spotting the Signs of RCD Tripping
RCD tripping is hard to miss. It usually results in a complete loss of power to a section of or your entire home. You’ll find lights go out, appliances stop working, and your electronics suddenly power down.
This sudden outage differs from a tripped MCB (Miniature Circuit Breaker), which only affects a specific electrical circuit. If you’re unsure what tripped, head to your consumer unit, which is often tucked away under the stairs.
Deciphering the Consumer Unit Maze
Inside the consumer unit (also called a fuse box) you’ll see an array of switches. Look for one labelled “RCD” or with a “T” or “Test” button. This is the RCD.
If the RCD switch has flipped to the “OFF” position, that confirms it’s done its job and there is an earth fault. Don’t just ignore it, though. Repeated RCD tripping means there’s an underlying issue demanding attention.
Why is My RCD Tripping: A Look at the Usual Suspects
There’s a limited number of reasons why your RCD keeps tripping. Some of the most common culprits include:
1. Faulty Appliances
That old kettle that sparks a bit too enthusiastically? The hairdryer with the frayed cord you’ve been meaning to replace? These could be the reason your circuit breaker keeps tripping. Even something as simple as a toaster can cause RCD tripping if there’s an electrical fault or internal moisture. This is especially true if your consumer unit is old.
Appliances with heating elements such as washing machines, fridge freezers, and central heating systems can cause an RCD to trip if the heating element develops a fault. Always prioritize your safety and have suspect appliances checked by a qualified electrician.
2. Nuisance Tripping: An Age-Old Battle
Modern appliances, particularly those with electronic components, often have small amounts of what’s known as “earth leakage”. This can add up and cause the RCD to trip intermittently.
This “nuisance tripping” can also be triggered by factors like stormy weather and temporary power surges from other appliances on the same electrical circuit. An incorrect RCD rating can also cause nuisance tripping. It is important to make sure you have the correct RCD rating for your electrical system.
3. Water, Water Everywhere: A Recipe for Trouble
Water and electricity don’t mix well. Whether it’s rain seeping into an outdoor socket, a plumbing leak dripping near wiring, or even condensation inside an electrical box, moisture is a major RCD tripping culprit.
To prevent a potential electric shock, ensure you keep electrical devices and power tools away from water. Extension leads are also a tripping hazard if they get wet. As a homeowner, it is critical that any time you suspect moisture-related issues near electricity, call a qualified and licensed electrician.
4. Damaged Wiring: A Hidden Threat
Wiring deteriorates over time. Rodents can nibble on cables, screws drilled into walls might pierce a wire, or old wiring can simply degrade, causing intermittent faults and those dreaded RCD trips.
Damaged wiring as the cause of an RCD tripping is a serious electrical problem. Damaged wiring can cause short circuits, and electrical malfunctions. If you are experiencing a tripped RCD and suspect your electrical wiring is damaged, contact a professional electrician immediately.
RCD Tripping FAQs
My lights are flickering, is this my RCD tripping?
An RCD tripping will cause the electrics to turn off completely. If your lights are flickering, it may be an issue with your light switch, light fitting or the wiring to the light fitting. An electrician will be able to diagnose the issue.
How do I find out what is causing my RCD to trip?
If your RCD is tripping, the first step is to unplug everything and see if the RCD trips again. If the RCD does not trip then you can start plugging things in one at a time to determine what is causing it to trip. However, the best advice would be to contact a qualified electrician.
Can I reset my RCD myself?
If your RCD has tripped you can try resetting it yourself by switching it from the off position back to the on position. However, you should never repeatedly reset an RCD without knowing the reason for the fault.
How often should my RCD trip?
Your RCD should very rarely trip. If your RCD is tripping regularly, you must contact an electrician to investigate.
What should I do if I see sparks or smell burning from an outlet or appliance?
Turn off the power at the consumer unit immediately. Do not touch or try to extinguish any fire yourself, evacuate the area and contact the emergency services.
Conclusion
An RCD tripping can be frustrating, but remember that it’s a sign that your safety systems are working correctly. By understanding the common causes and knowing how to respond, you can address the issue quickly and safely.
If you need to call out an electrician to help with your RCD, why not get in touch with our team? We’re here to help you whenever you need it and we have dozens of 5-star reviews for you to read through!
