Your switchboard is the control centre for every electrical circuit in your home. Here is a plain-English guide to understanding what is inside it, what each component does, and when it is time to call an electrician.
Your switchboard is the metal box — usually mounted on a wall in your garage, laundry, or hallway — where your home's electricity supply is distributed to individual circuits. It is the central point where the power coming into your property is split up and directed to different parts of the house: lights, power points, oven, hot water, air conditioning, and so on.
Inside the switchboard you will find a combination of circuit breakers, safety switches (RCDs), and possibly a main switch. Each of these components has a specific job in protecting your home and your family.
Circuit breakers are the individual switches inside your switchboard — typically arranged in a row. Each one controls a separate circuit in your home. They are designed to automatically switch off (trip) if the circuit they protect draws too much current, which could mean an overload or a fault.
Most circuit breakers are labelled with a number — such as 10, 16, 20, or 32. This number is the amperage rating, which tells you the maximum current that circuit is designed to carry. A 16-amp breaker, for example, will trip if the circuit exceeds 16 amps.
In a well-labelled switchboard, each breaker will also have a label or sticker indicating which part of the house it controls — for example, "Kitchen Power," "Bedroom Lights," or "Air Conditioning." If your switchboard is not labelled, that is something worth getting your electrician to do next time they visit.
Safety switches — also called Residual Current Devices (RCDs) — look similar to circuit breakers but have one key difference: a small test button, usually marked with a "T" or "Test." This test button is how you distinguish a safety switch from a standard circuit breaker at a glance.
Safety switches monitor the flow of electricity through a circuit and will trip almost instantly if they detect current leaking to earth — which is what happens during an electric shock. They are life-saving devices, and Queensland law requires them on all power point circuits and lighting circuits in residential properties.
You should test your safety switches every three months by pressing the test button. The switch should trip immediately. If it does not, call an electrician — the device may be faulty and will not protect you in a real fault situation.
The main switch is typically the largest switch in your switchboard, often located at the top or on the left side. Switching it off cuts power to the entire property. This is useful in emergencies — for example, if you need to isolate all power due to flooding, a fire, or a serious electrical fault.
Know where your main switch is and make sure everyone in your household knows how to use it. In an emergency, seconds count.
If your switchboard is not labelled, you can work out which breaker controls which area by switching off one breaker at a time and checking which lights or power points stop working. It is a simple process, but having someone else in the house to call out which room has lost power makes it quicker.
Once you have identified each circuit, label the switchboard. A permanent marker on masking tape works, or your electrician can provide proper labels during a service visit.
If a circuit breaker trips, start by unplugging everything on that circuit. Then reset the breaker by switching it firmly back to the ON position. If it stays on, plug your appliances back in one at a time — if the breaker trips again when you plug in a specific appliance, that appliance is likely the problem.
If the breaker trips again with nothing plugged in, the issue is likely in the wiring itself — and that is when you need an electrician.
Some switchboard issues are beyond a homeowner's ability to diagnose or fix. Call a licensed electrician if you notice any of the following:
Switchboards do not last forever. If your home was built before the mid-2000s and the switchboard has never been upgraded, it is likely undersized for modern electrical demands. Air conditioning, EV chargers, induction cooktops, and the general increase in appliance use put more strain on older switchboards than they were designed to handle.
Common indicators that your switchboard needs upgrading include: no safety switches, ceramic fuses, a board that is full with no spare capacity, frequent tripping, or visible signs of age and wear. A switchboard upgrade brings your home in line with current safety standards and provides the capacity you need for how you actually use electricity today.
If you are unsure about the condition of your switchboard or want it inspected, labelled, or upgraded, call Joel on 0418 416 481. Straightforward advice, no pressure.
Every three months. Press the test button on each RCD — it should trip immediately. Reset it by switching it back to the ON position. If a safety switch does not trip when tested, it may be faulty and should be inspected by a licensed electrician as soon as possible.
Yes, it is safe to reset a tripped breaker by switching it back on. If it trips again immediately or repeatedly, stop resetting it and call an electrician. Repeated tripping indicates a fault that needs professional diagnosis — continuing to reset it will not fix the underlying problem.
In Queensland, safety switches are required on all power point circuits and all lighting circuits in residential properties. If your home was built or rewired before these requirements came into effect, you may not have full coverage. A licensed electrician can assess your switchboard and install additional safety switches where needed.
