Why Does My Power Keep Tripping? A Brisbane Sparky Explains

When your safety switch trips, your switchboard is cutting power to protect you from a fault. The switch is doing its job. Something on that circuit isn’t.

The annoying part is working out what. Here’s how to think it through.

What’s actually happening in your switchboard

Two different devices do the tripping, and they’re not the same thing.

Circuit breakers protect the wiring. They trip when a circuit pulls more current than the cable can safely carry. Overloads and short circuits.

Safety switches (RCDs) protect you. They trip the instant they spot current leaking somewhere it shouldn’t, through a dodgy appliance, a wet light fitting, or you. They react in about 30 milliseconds. That’s fast enough to stop a shock killing you.

When people say “the power keeps tripping,” it’s usually the safety switch. Both matter, though. Don’t ignore either. If you want the longer version of how RCDs work, we wrote a whole piece on switchboard safety.

The five most common causes

1. A faulty appliance

This one’s the winner by a mile. A hairdryer with a cracked element. A kettle with moisture in the base. An old washing machine that’s seen better days. Any of these can leak current to earth and trip the safety switch the moment you plug them in.

How to find it: reset the switch, then unplug everything on that circuit. Reset again. If it holds, plug appliances back in one at a time until it trips. Whatever you plugged in last is your culprit.

2. Too much running on one circuit

Older Brisbane homes, anything built before the mid-1990s, often have a single circuit feeding the whole kitchen or living area. Run a microwave, toaster, kettle and coffee machine at the same time and you’ll pull more current than that circuit was ever meant to carry.

The breaker trips. You reset it. It holds, right up until you make toast and boil the kettle together.

The fix isn’t resetting the breaker over and over. You either spread the load across different circuits or get a new dedicated circuit put in. Keep tripping it under load and you can wear the breaker out.

3. Water in a light fitting or power point

Queensland weather does things to houses. Water tracking into a downlight from a leaky roof. Condensation in a bathroom exhaust fan. A garden power point that’s copped too much rain. Each one creates a leakage path to earth, and each will trip your safety switch. Sometimes only now and then, which makes it harder to pin down.

If the trips show up after heavy rain, or only in wet parts of the house, water getting in is the first thing to suspect.

4. A failing safety switch

Safety switches don’t last forever. After 10 to 15 years the guts of them can wear to the point where the switch nuisance-trips. Or worse, stops tripping when it should. Test yours by pressing the T (test) button on the switch. Power should cut straight away. If it doesn’t, the switch has failed and needs replacing.

If it trips at random with nothing obvious drawing load, and it’s an older unit, the switch itself might be the problem rather than anything plugged in downstream.

5. A wiring fault in the wall

This is the one you can’t sort out yourself. Perished insulation. A nail driven through a cable years ago. A loose connection at a junction box. These cause intermittent faults that come and go with temperature, moisture or movement. They’re also genuinely dangerous left alone.

If you’ve cleared the appliances and the tripping is random or won’t reproduce, there’s a wiring fault hiding somewhere and you need a licensed electrician to trace it.

What you can do before calling

Note which switch tripped. Is it a circuit breaker (usually labelled by room or load) or the safety switch (marked RCD, or with a T button)?
Unplug everything on that circuit and reset.
Plug in one appliance at a time until it trips again.
Look for obvious water. Wet areas, recent rain, a new roof leak.
Press the T button on each safety switch to check they still work.

Find a faulty appliance? Take it out of service. Don’t keep resetting and using it.

If the switch trips with nothing plugged in, or you can’t isolate the cause, stop resetting it and call someone.

When you need to call an electrician

Get a licensed sparky out when:

The switch trips with nothing plugged in
You can’t find the faulty appliance after isolating everything
It trips in wet weather or near wet areas (water might be getting in)
Your safety switch is older than 10 years and acting up
The breaker feels warm or smells burnt
It keeps tripping on a circuit that’s barely loaded

If you’re in an older home with a single safety switch covering the lot, undersized circuits, or wiring nobody’s looked at in decades, a switchboard upgrade is worth thinking about too. Across Brisbane and Logan we see plenty of boards that are due.

FAQ

Can I just keep resetting the safety switch? No. Resetting clears the symptom, not the fault. If there’s a real current leak, from an appliance, the wiring or water, you’re hiding a hazard. Some of those faults turn into fires or shocks. Find the cause first.

Is a tripping circuit breaker the same as a tripping safety switch? No. A circuit breaker protects wiring from overloads. A safety switch (RCD) protects people from electrocution. Both can trip, for different reasons. On older switchboards you might only have breakers and no safety switches at all, which is its own problem worth knowing about.

How much does it cost to fix a tripping safety switch in Brisbane? It depends on the cause. Swapping out a faulty safety switch is usually a straightforward job: labour plus the part. Chasing an intermittent wiring fault takes longer and costs more. We give you a fixed quote before any work starts, so you’re not guessing. For a wider look at pricing, see our electrician cost guide for Brisbane.

Still tripping? Let’s find it.

Worked through the steps and still can’t pin it down? Or you’d rather not poke around in your own switchboard? Give us a call on 07 3186 2450 or book a time online. No call-out fee, and we’ll tell you what we’ve found before we touch anything.