Why the WA government is talking about safety switches right now
You may have seen the WA government's current campaign reminding Perth households to test their safety switches. It's being run by the Department of Energy, Mines, Industry Regulation and Safety as part of its Be Safe public-awareness work, and they're saying it plainly:
“Residual current devices — RCDs, or safety switches — are the single most effective protection against electrocution, serious electrical injury and electrical fires in the home.”
— Department of Energy, Mines, Industry Regulation and Safety (WA)
That's a strong claim, and they're not exaggerating. An RCD is a small, unflashy device sitting inside your switchboard that quietly does the most important job in the place — cutting the power within thirty milliseconds of detecting electricity flowing somewhere it shouldn't.
Three things to know up front:
- WA law requires every home to have at least two RCDs. One protecting the power circuits, one protecting the lighting circuits. That's the legal minimum.
- We recommend going further: RCD protection on every circuit. Modern switchboards use RCBOs — a combined RCD and circuit breaker in a single device — to protect each circuit individually. When something trips, only that circuit goes down. The fridge keeps running while you sort the issue. We fit per-circuit RCD protection on every new switchboard build.
- Whatever you've got, test it. Newer Perth homes generally have the two-circuit minimum. Pre-1990 homes that haven't been renovated often have none at all. Either way, the bigger issue across the city is that very few are ever tested. The press-button test takes ten seconds and the WA government recommends doing it every three months.
This guide walks through what an RCD does, the 10-second test you can do yourself this afternoon, and the moments when it's time to call a licensed electrician instead. If you'd rather just have someone come check the lot, give us a ring on 0483 967 122.
What an RCD actually does (and why a circuit breaker isn't enough)
Most people lump everything in the meter box together — switches, fuses, breakers, "the things that trip" — and don't think about it again until something goes wrong. It's worth knowing the difference, because the protection each one offers is completely different.
A circuit breaker protects the wire. If a circuit draws too much current — overloaded power board, faulty heater, short circuit — the breaker trips and stops the wire from overheating. That prevents a fire inside the wall. It does not protect a person who happens to be touching a live wire.
An RCD protects the person. It monitors the current flowing into a circuit on the active wire and the current flowing back out on the neutral. Those should be equal. If they aren't — because some of the current is escaping through a damaged appliance, water, or a human body — the RCD cuts the supply within thirty milliseconds. Fast enough that a shock becomes a scare, not a hospital visit.
A fuse is the older technology that pre-dated circuit breakers. It does the same job as a breaker (protects the wire) but once it blows it has to be replaced. Many older Perth homes still run on ceramic fuse boards. None of those homes have RCD protection at the switchboard.
| Protection type | What it protects | Required by WA law? |
|---|---|---|
| Fuse (ceramic) | The wire | Outdated. Not RCD-protected. |
| Circuit breaker (MCB) | The wire | Yes, but not enough on its own |
| RCD (safety switch) | The person | Yes — at least 2 per home |
| RCBO | Both (combined device) | Yes — modern equivalent |
The point: an RCD is the only device in your switchboard that's actively protecting the people in your house from a shock. If you don't have one, or yours is faulty, nothing else in the meter box is filling the gap.
The 10-second test you can do this afternoon
This is the test the government is encouraging every household to do. It takes less time than reading this paragraph.
Find your meter box and open it
Usually mounted on an outside wall, in the garage, or in a hallway cupboard. The WA Government's guidance: if your meter box is in good condition and you feel confident to do so, open it and look for switches with a small T button (sometimes also marked “TEST”) on the face. That's an RCD. You should have at least two. If your meter box is damaged, corroded, or you're unsure, leave it alone and call a licensed electrician to inspect it.
Press the T button on each RCD
One at a time. The switch should flip to OFF immediately the moment you press T. That's the RCD intentionally tripping itself to prove it can. The lights or power on that circuit will go off briefly — that's the point. If the flip to OFF isn't immediate, the RCD is faulty — call a licensed electrical contractor.
Flip the switch back up to reset
Power comes back on, and the switch should stay in the ON position. Move to the next RCD and repeat. Once you've done all of them, you're done. Set a reminder for three months from now and forget about it until then. If a switch won't stay in the ON position after reset, that's also a fault — call a licensed electrical contractor.
Pressing the T button confirms the RCD's trip mechanism is working. It does not measure how sensitive the trip is or how fast it cuts power — that requires calibrated test equipment. The Australian Standard recommends a full function test by a licensed electrician every two years on top of the home owner press-button test.
If every RCD trips and resets cleanly, your safety switches are doing their job. Test them again in three months. If anything doesn't behave the way it should — T button does nothing, switch won't reset, or you can't find any T buttons at all — you've found a problem that needs an electrician.
When to call us instead of (or after) testing
The test is simple. The fixes, sometimes less so. These are the five most common moments we get a call about RCDs from Perth homeowners.
1. There are no T buttons anywhere in the box
Older Perth homes — especially pre-1990 builds that haven't been renovated — often have ceramic fuses or basic circuit breakers and no RCD protection at all. WA law has required RCDs on power and lighting circuits for years now, but the law applies when the switchboard is upgraded, not retrospectively to every old home. If you can't see any T buttons, your house has no safety switch protection. We retrofit them in half a day if the board has space, or recommend a full switchboard upgrade if it doesn't.
2. There's only one
Some homes have a single RCD covering everything, sometimes as part of a renovation done on the cheap. That doesn't meet the current standard. If the one RCD trips, you lose everything — lights, fridge, freezer, hot water — in the middle of the night, with no light to see what you're doing. Separate RCDs on lighting and power means if one trips, the other keeps the house functional while you sort the problem out. Adding the second is usually a half-day job.
3. The T button doesn't trip the RCD
You press T. Nothing happens. The switch stays where it is. That RCD is faulty. It looks functional. It isn't protecting anyone. The fix is replacement — same-day in most cases — with a current-model device. Safety switch installation and replacement is one of our most common jobs.
4. An RCD keeps tripping and won't reset
Trip happens, you flip it back up, it trips again. Something on that circuit is leaking current — an appliance with a damaged cord, moisture in an outdoor light fitting, water in a wall cavity after recent rain, or a faulty hot water element. Don't keep resetting it. That's the part that becomes dangerous — either by getting the user a shock or by overheating the wiring on a repeated fault. Unplug everything on that circuit, see if the trip stops. If it doesn't, call us. We carry the test equipment to trace and isolate the fault, usually same-day.
5. You've just bought an older home, or you're a landlord
Older homes change hands often without an electrical inspection. New owners inherit whatever the previous owner left — sometimes a beautifully maintained switchboard, sometimes a 1980s special with no RCDs and aluminium wiring. Worth getting an electrical safety inspection done in the first month after settlement. For landlords: WA tenancy laws require working RCDs on rental properties, and the responsibility is yours.
Workplaces, retail tenancies, offices, and strata-managed buildings have separate RCD requirements under WorkSafe WA and AS/NZS 3760. Push-button testing every six months and a full function test every twelve months is the baseline, with record-keeping required and increasingly enforced. We handle annual RCD compliance testing for commercial premises and strata properties across Perth — just ask about it on the call.
Why RCD work is a licensed-electrician job in WA
The press-button test is fine for any home owner to do. Anything inside the switchboard — installing a new RCD, replacing a faulty one, fitting a new switchboard, finding why a circuit keeps tripping — isn't.
The switchboard carries live mains voltage that can't be safely isolated by the home owner. Even with the main switch off, the cables coming into the switchboard from the meter are still live — only Western Power can isolate that upstream supply. Working inside a live switchboard without the right training, equipment, and procedures has killed people who tried it.
The Western Australia Electricity (Licensing) Regulations 1991 require a licensed electrician for any work inside the switchboard. Beyond the safety reason, a licensed electrician issues the Notice of Completion and Electrical Safety Certificate that your home insurance and any future sale of the property will need. Unlicensed work is illegal, voids your insurance, and shows up at the next inspection.
All work inside a residential switchboard in Western Australia must be performed by a licensed electrician under the Electricity (Licensing) Regulations 1991. Installations require an Electrical Safety Certificate and Notice of Completion. WA law requires every home to have at least two RCDs — one protecting the power circuits and one protecting the lighting circuits. Licence number EC009022.
What we do when you give us a call
Every RCD job — retrofit, replacement, fault-finding, or full switchboard upgrade — runs the same five-step process. No surprises on price, no surprises on scope.
Phone price estimate
You ring us, describe your switchboard (number of switches, are there any T buttons, is it ceramic fuses or modern breakers, when was the house built). A photo helps if you have one. We give you a price estimate on the call covering the work likely to be needed.
On-site walkthrough
We come out and look at the board properly. We confirm what's there, what's missing, the condition of the cables, and whether the board has the physical space for new RCDs or needs a full upgrade. The walkthrough confirms the final price before any work starts. No surprises.
Isolation and assessment
Power is isolated where required. We test the existing circuits to identify any pre-existing faults that would affect the new RCD — a circuit with a low-level leak that already exists will trip a new RCD on the first day if we don't find it first. This step is what separates a clean install from a callback.
Install, replace, or fault-find
Depending on the job: install new RCDs onto vacant slots in the board, swap faulty units for current models, fault-find a leaking circuit and repair it, or remove and replace the entire switchboard for older or full homes. For new switchboard builds we install per-circuit RCBO protection rather than the minimum two grouped RCDs — it costs a bit more but it's the modern standard, and it means a future trip only takes down the affected circuit. All work uses Clipsal switchgear (the standard we trust across every install).
Test, certify, and walk you through
We function-test every RCD with calibrated test equipment, confirm the trip times meet the standard, restore supply, and walk you through how to do the quarterly press-button test yourself. You receive a Notice of Completion and Electrical Safety Certificate. Lifetime workmanship warranty on the install.
Common questions about RCD testing in Perth
The WA government's Department of Energy, Mines, Industry Regulation and Safety recommends pressing the T (test) button on each RCD in your switchboard at least once every three months. The test takes ten seconds and is the only way to confirm the device is still working. The test button trips the RCD on purpose. If it doesn't trip when you press it, the RCD is faulty and needs to be replaced by a licensed electrician. In addition to the home owner press-button test, a full function test with calibrated equipment should be done every two years.
An RCD (residual current device, also called a safety switch) monitors the electricity flowing into and out of a circuit. If it detects an imbalance — for example, current leaking through a person who has touched a live wire, or escaping through a damaged appliance — it cuts the power within 30 milliseconds. That's fast enough to prevent fatal electrocution. The WA government describes RCDs as "the single most effective protection against electrocution, serious electrical injury and electrical fires in the home." A circuit breaker or fuse, by contrast, only protects the wire from overload — not the person from a shock.
Yes. Installing, replacing, or modifying RCDs is work inside the switchboard, which carries live mains voltage that cannot be safely isolated by the home owner. Under the Western Australia Electricity (Licensing) Regulations 1991, all switchboard work must be performed by a licensed electrician. Unlicensed work is illegal and voids your home insurance. The work also requires a Notice of Completion and Electrical Safety Certificate, which only a licensed electrician can issue.
A straightforward retrofit of two RCDs into an existing modern switchboard typically takes half a day and is one of the more affordable safety upgrades you can make. If the switchboard is older, has ceramic fuses, or doesn't have the physical space for new RCDs, a full switchboard upgrade may be the better-value path. We give every customer a price estimate on the phone after a quick description (or photo) of the switchboard, then confirm the final price during the on-site walkthrough before any work begins.
Stop using that appliance until it's checked. A repeatedly tripping RCD is the device doing its job — something is leaking current. It could be a damaged power cord, water inside an outdoor light fitting, moisture in a wall cavity, or a faulty appliance. Don't keep resetting the RCD as a workaround — the repeated tripping is the warning, not the problem. Call a licensed electrician to find and fix the fault. We carry test equipment that locates leaking circuits the same day in most cases.
Yes. "Safety switch" is the common Australian household term. "RCD" is the technical name (Residual Current Device). They are the same device. You may also see "RCBO" — that's an RCD and circuit breaker in a single unit, common in newer switchboards. All three protect against the same danger: electricity escaping where it shouldn't.
Older Perth homes — especially pre-1990 builds that haven't been renovated — often have ceramic fuse boards with no RCDs at all. These were legal at the time of installation but no longer meet the safety standard. WA law requires every home to have at least two RCDs — one protecting the power circuits and one protecting the lighting circuits. We typically recommend a full switchboard upgrade for these properties: modern circuit breakers, RCD protection on every circuit, and capacity for the appliance loads modern homes actually run. It's a half-day to one-day job depending on the property.