Switchboard devices, testing & replacement

Surge Protector Installation Sydney

Most of the transients that kill electronics never came from a storm. They are made inside the building, by the ordinary switching of ordinary loads, and they arrive on a day nobody remembers afterwards.

Call us on 0401 427 270 Request a quote

Devices sized to your supply Status windows checked Level 2 accredited

Rated 5 stars on Google

30+Years on the tools

1.5 kVWhat your electronics survive

7am–5pmEvery day, Mon to Sun

Get a fast quote

Pricing agreed before we start. We usually reply the same day.

Licensed 387609CFully insured
AS/NZS 3000Compliant workmanship
5 star ratedOn Google reviews
Upfront pricingAgreed before we start
Same day serviceCall before 11am

The real cause

Lightning gets the blame. Your fridge does the damage

Sydney does get the storms. On 19 February 2024 roughly 75,000 lightning strikes were recorded within 100 kilometres of the CBD in the three hours between 11am and 2pm. Days like that take out equipment across whole suburbs, and they are the reason most people go looking for surge protection in the first place.

A nearby strike is not what most damaged equipment has actually met, though. Industry figures put roughly two thirds of the transients on a network as having been generated inside the building itself, by load switching rather than by weather. Every time a motor stops, a compressor cuts out, a large inductive load is switched or the utility clears a fault up the street, a collapsing magnetic field pushes a short, sharp voltage spike back onto the wiring.

Individually these are small. None of them kills a television on the day. What they do instead is wear things down, so switch-mode power supplies, LED drivers and control boards age faster than they should and something eventually fails for no visible reason, months or years after the damage started. That is why appliances in one house seem to die young while an identical house down the road is fine.

It also changes who needs protection. If surges were only a storm problem you could reasonably decide your risk was low. Because most of them are made at home, exposure is a function of what is plugged in, and modern houses are full of electronics that did not exist when their switchboards were built.

Coordination

Why one device on its own is not surge protection

Protection works in stages. Each one knocks the voltage down and hands the remainder to the next. The question is never whether you have a device, it is where the voltage has got to by the time it reaches the thing you care about.

Scroll to see the full chart →

What it means: a Type 1 device does the heaviest work of the four and it still leaves 2.5 kV on the wire, which is above what a modem or a television is built to take. It is the Type 2 device at the switchboard that first brings the figure under the line, and the Type 3 device at the equipment that gives it margin. Anyone selling a single box as complete protection is describing one step of a staircase.

The 1.5 kV figure is not marketing. Equipment is built to a rated impulse withstand voltage set by where it sits in the installation. At the origin, the switchboard is built for 6 kV. Fixed wiring and hardwired gear sit at 4 kV, ordinary plug-in appliances at 2.5 kV, and sensitive electronics fed through an external power supply at 1.5 kV.

The further into the house you go, the less the equipment is expected to take, because it is assumed something upstream has already dealt with it. If nothing has, that assumption is exactly what fails.

The three types

What each stage is actually for

The naming is international rather than local, and it describes what a device has been tested against, not where a salesperson would like to put it.

Type	Tested against	Where it goes	Who needs it
Type 1	A 10/350 microsecond impulse, the shape of real lightning current	At the origin of the installation, as close to the incoming supply as the board allows	Buildings with a lightning protection system, exposed overhead supply or a private pole. Uncommon in an ordinary suburban house
Type 2	An 8/20 microsecond impulse, the shape of an induced or switching surge	In the main switchboard, on its own protective device	The one nearly every house is missing, and the one that does the most good per dollar
Type 3	A combination wave. Lower energy, finer clamping	At or near the equipment, which includes the better powerboards	Anyone with something genuinely worth protecting. Only valid with a Type 2 upstream

A Type 3 device on its own is the common mistake. It is not built to absorb a large transient, so on a serious event it will either sacrifice itself without saving the load or, if it is a cheap one, fail in a way you would rather it did not.

It is a finishing stage. It needs something upstream doing the heavy work, and the two need enough cable between them that the upstream device sees the surge first, which is why the guidance is to allow around ten metres of separation between stages rather than stacking them in the same enclosure.

Installation

The part that decides whether it works

A surge protective device does not absorb energy so much as divert it. The quality of the path you give it matters as much as the device you bought.

Keep the leads short

This is the rule that gets ignored, and it quietly halves the value of the install. The connecting leads carry a fast-rising current, so they develop a voltage of their own that adds directly on top of whatever the device is clamping to. Guidance is that the total length through the device and back should not exceed one metre, and that 300 to 600 millimetres is what you should be aiming for.

A device fitted at the far end of the board with generous loops of cable lets through meaningfully more than the same device fitted tightly. Same part number, same price, worse result.

The earth has to be sound

Everything a surge protective device diverts, it diverts to earth. If the earthing at the switchboard is old, undersized, corroded at the connection or relying on a water pipe that has since been replaced in plastic, the device has nowhere to send what it collects.

Checking the earth is part of fitting one properly. On older North Shore boards this is occasionally where the job grows, and we would rather tell you that before we start than discover it with the cover off.

Sized to the supply, not to the catalogue

A device has a maximum continuous operating voltage, written as Uc, which is the voltage it can sit across all day without conducting. On a 230 volt single-phase supply that is typically 275 volts, with higher values used where the supply runs high or the configuration calls for it.

Choosing this wrongly does not fail obviously. It makes the device conduct a little all the time, heat up, and reach the end of its life years early. It looks like a faulty product and it is actually a specification error.

It needs its own protection, and a clear view

A surge protective device fails eventually by design, and it needs an overcurrent device ahead of it so that when it does, the rest of the board stays live. Fitting one without that arrangement means its end of life becomes your outage.

It also has to be somewhere you can see. A device buried behind a panel nobody opens will sit dead for years without anyone noticing, which defeats the entire point of the status window on the front of it.

Repair & replacement

They wear out, and the window tells you

This is the half of surge protection nobody is sold, and it is why plenty of houses that paid for protection do not currently have any.

The window has gone red

The device has disconnected itself and there is no protection at that point. Inside is a metal oxide varistor, and every transient it clamps causes a small amount of permanent damage at the microscopic level. That damage accumulates and never resets.

When enough has built up, an internal thermal disconnector opens and takes the varistor out of circuit before it can overheat. Green means live, red means finished. It is a module change rather than a switchboard job.

You have had a serious storm

A device that has taken one large event may have spent most of its life in a single afternoon while still showing green, because the disconnector responds to accumulated heat rather than to how close the last event came.

After a strike nearby, or after equipment in the house has failed, the device is worth checking rather than assuming. This is the one case where you should not wait for the flag to change.

Nobody has looked in years

The failure mode here is silence. A surge protective device that has ended its life does not trip anything, does not affect the lights, and does not announce itself in any way you would notice from inside the house.

If yours went in during a switchboard upgrade some years ago and has not been looked at since, the honest position is that nobody knows whether it still works. A glance at the front of the board settles it.

Equipment keeps failing for no reason

Repeated failures of power supplies, LED drivers, modems or control boards in one property, with no obvious cause, points at the supply rather than at bad luck with brands.

Worth checking alongside the board itself. Old wiring, a tired switchboard and an absence of surge protection tend to travel together, and the surge device is the cheapest of the three to address.

The other way in

Power is only one of the cables entering your house

A protected switchboard deals with everything arriving on the mains. It does nothing at all about the other conductors coming through the wall, and on a modern house there are several of them.

The NBN lead, a coaxial television cable, an external antenna, a roof-mounted aerial, cabling out to a camera on the garage or a gate motor at the street: each is a length of metal running through the same electromagnetic field as everything else. A nearby strike induces a voltage on all of them at once. The difference is that data cabling is thin and the interfaces it lands on are fragile, so it takes far less to destroy them.

The result is a familiar one. A modem or a television dies during a storm in a house that has surge protection at the board, and it looks like the protection failed. It did not. The surge came in the other door, and there was nothing on it.

Solar adds another. The DC side of an array is a long run of cable across a roof, which is about as exposed as domestic wiring gets, and it deserves its own device rather than relying on whatever sits at the switchboard downstream of the inverter.

Compliance

What the standards actually require

Licence 387609C Level 2 accredited & insured

AS/NZS 3000 does not force a surge protective device into a house. It sets out when one should be considered, which includes exposed or overhead supply, areas that see frequent disturbances, and installations feeding equipment worth protecting. That is why nobody has ever failed an inspection for the absence of one, and it is also why most homes do not have one.

What is not optional is that the work be done properly. Fitting a device at the switchboard is ordinary licensed electrical work, so any licensed electrician can carry it out. Level 2 accreditation becomes relevant only if the job reaches the network side, for instance where the board needs more supply or the metering has to be rearranged to make room. We hold it, so that possibility does not turn into a second trade and a second visit.

Either way the work is certified. We lodge a Certificate of Compliance for Electrical Work within 7 days of testing, which since 1 July 2026 goes through the BCNSW eCert portal.

If your switchboard is being upgraded anyway, that is the moment to add surge protection. The board is open, the leads can be kept short, and the incremental cost is a fraction of doing it as a visit of its own.

Good to know

Surge protection questions

Do I actually need surge protection, or is it a sales add-on?

It depends on what is plugged in rather than on where you live. Most transients are generated inside the building by ordinary switching, so a house full of electronics is exposed on any given day, not only during a storm. AS/NZS 3000 treats a surge protective device as something to consider rather than something mandatory in a home, which is why nobody has ever made you fit one. The honest answer is that a switchboard device is inexpensive relative to what sits behind it, and if your switchboard is being worked on anyway it is the cheapest it will ever be to add.

Is a surge protection powerboard enough on its own?

It protects whatever is plugged into it and nothing else, and it is working on the tail end of a surge that has already travelled through your wiring. That is genuinely useful for one expensive item, and it is the only option in a rental where you cannot touch the switchboard. What it cannot do is protect anything hardwired, and it is not built to absorb a large event on its own. The board device and the powerboard are meant to work as a pair rather than as alternatives.

How long does a surge protector last?

There is no fixed lifespan, because it depends entirely on how much work it has done. The metal oxide varistor inside degrades slightly every time it clamps a transient, and that damage accumulates and does not reset. Eventually an internal thermal disconnector opens and takes the device out of circuit. Most switchboard units carry a small window that shows green while the device is live and red once it has disconnected, so the answer is to look rather than to count years.

My surge protector shows red. Does that mean it worked?

Usually yes, and it also means you currently have no protection at that point. The device has reached the end of its useful life, either through one large event or through the accumulation of many small ones, and it has taken itself out of circuit deliberately so it cannot fail dangerously. The rest of the switchboard keeps working normally, which is why people leave a red flag showing for years without noticing. It is a module swap rather than a rebuild.

Does a surge protector need a Level 2 electrician?

Usually not. Fitting a surge protective device at the main switchboard is ordinary licensed electrical work, and any licensed electrician can carry it out. Level 2 accreditation comes into it only when the job touches the network side, for example if the switchboard needs more supply or the metering has to be rearranged to make room. We hold it, so if that turns out to be the case we do not have to hand the job to a second trade.

Will it protect my internet and TV equipment?

Not if the surge arrives on the data side, and that is the gap most installations have. Power is only one path into a house. The NBN line, the coaxial television lead and any external antenna or camera cable are all conductors entering the building, and a transient induced on one of them walks straight past a protected switchboard and into the back of the equipment. Anything with two cables going into it needs both of them covered, or the unprotected one becomes the way in.

How does your pricing work?

Attending your job is a chargeable callout. We confirm what it costs when you book, and the price for the work itself is agreed before we start, so there are no surprises on the invoice.

Where we work

Surge protection across the North Shore

Based in Castlecrag, covering all of Sydney. A few of the suburbs we work in most:

Related work: a switchboard upgrade is the natural moment to add surge protection, and if original wiring sits behind it, rewiring is the conversation underneath both. Where the board needs more supply to make room, consumer mains and Level 2 work covers it. For the data side we also handle data cabling and CCTV. See the full list of locations we service.

Not sure whether yours is still working?

It takes a minute to look. Upfront pricing, with the price agreed before we start.

Call 0401 427 270 Request a quote