Why Do My Electrics Keep Tripping? A Dorset Electrician Explains

Few things are more annoying than the power cutting out just as you sit down for the evening. If your electrics keep tripping, it’s your safety system doing its job — but it’s also telling you something needs attention. Here’s what’s usually behind it, what you can safely check yourself, and when to call in a qualified electrician.

First, what’s actually tripping?

In a modern consumer unit (“fuse board”), a switch flicking to off is almost always one of two devices: an MCB (protects a circuit from overload/short circuit) or an RCD (cuts power fast if it detects electricity leaking to earth — the device that protects you from a shock). Which one trips tells an electrician a lot about the cause.

The most common causes

• A faulty appliance. A failing kettle, washing machine, immersion heater or even a phone charger can leak current and trip an RCD. This is the number-one cause we find.
• Overloaded circuit. Too many high-power items on one circuit (heaters, tumble dryer, kettle together) can overload an MCB.
• Water or moisture. Rain getting into an outdoor socket or light, or a leak near wiring, is a classic RCD-tripper.
• Damaged or ageing wiring. Older cables, rodent damage, or a nail through a cable during DIY can cause faults.
• A faulty RCD itself, or too many circuits crammed onto one RCD so a small fault takes out half the house.

How to safely narrow it down

You can do a little detective work without opening anything up:

1. Unplug everything on the affected area — every appliance, charger and lamp.
2. Reset the tripped switch once. If it holds, plug items back in one at a time, waiting a minute between each. The item that makes it trip again is your culprit.
3. If it trips immediately with nothing plugged in, or trips again straight after resetting, stop — that points to a wiring or fault issue that needs a professional.

When to stop and call an electrician

Please don’t keep flicking the switch back on repeatedly, and never poke around inside the consumer unit. Call a qualified electrician straight away if you notice any of these:

• A burning smell, buzzing, or warm/scorched sockets or switches
• Tripping that won’t reset at all, or trips instantly every time
• Any sign of water near electrics
• An old fuse board with rewireable fuses rather than modern breakers

Persistent tripping is often the first warning of a fault that’s worth catching early — a quick diagnostic visit usually finds it fast, and if the wiring is ageing an EICR (electrical safety inspection) will give you the full picture.