How to Tell If Your Switchboard Is Outdated
Written by Daniel Vasilevski
You do not need to open a switchboard to learn most of what matters about it. Age, protection type and available space are all readable from the front, and between them they answer the question people actually have: is this thing a problem, or is it just old?
Those are different questions. Age on its own is not a defect. Plenty of boards installed decades ago are in serviceable condition and were compliant with what applied when they went in. What matters is the protection fitted, the condition of the hardware, and whether the board suits the load the property now runs.
Here is how to read yours.
1. Ceramic fuses instead of circuit breakers
Look at the row of protective devices. If you see round ceramic holders that unscrew, with fuse wire inside, the board is pre-1980s in design.
Rewirable fuses do protect the circuit, but they have two real problems. They rely on somebody fitting the correct fuse wire, and the wrong gauge defeats the protection entirely. And they clear a fault more slowly than a modern breaker, which matters for the cable rather than for you.
What it means: worth replacing, and a board this old rarely has anything else modern behind it either.
2. No RCD protection
An RCD, or safety switch, is the device that protects a person rather than a cable. It watches for current leaking to earth and disconnects in a fraction of a second. A circuit breaker will not do this; it protects against overload and short circuit, not electrocution.
RCDs are wider and usually carry a test button. If nothing on your board has a test button, you have no RCD protection.
What it means: this is the single most consequential gap on an old board. Circuit breakers alone protect your wiring. They do not protect the person holding the drill.
3. The board is full
Count the spare ways. If every position is occupied and there is no room on the rail, nothing else can be added without replacing the board or fitting a sub-board.
Full boards are the normal end state of a house that has had a kitchen done, then air conditioning, then a pool, then a shed, each addition taking the last spare way.
What it means: not unsafe by itself, but it decides the scope of your next job. Adding a circuit becomes a board replacement.
4. Heat damage, scorching or a smell
Discolouration around a fuse holder or breaker, browning on the enclosure, melted plastic, or a smell of hot bakelite are all signs of a connection running hot.
Loose terminations are the usual cause. A terminal that is not tight has resistance, resistance makes heat, and heat loosens the terminal further. It is a fault that gets worse on its own.
What it means: get this looked at rather than filed away. Heat at a switchboard is the most common origin point for an electrical fire in a house.
5. An asbestos backing panel
Boards installed before the 1990s are often mounted on a flat panel that contains asbestos. Zelemite is one brand name you will see referenced; there are others.
It is usually a dark grey or brown sheet behind the equipment, sometimes with a manufacturer's stamp. Intact and undisturbed, it is not doing any harm. Drilling, cutting or breaking it is what creates a risk, which is why it changes the method and the cost of an upgrade rather than preventing one.
What it means: identify it before work starts, not halfway through. Removal is separately licensed work in NSW.
6. Aluminium tails, perished insulation, undersized neutrals
These are the ones you will not see from the front, and they are the reason an assessment beats a guess. On older installations the cable feeding the board can be aluminium rather than copper, the insulation can be brittle enough to crack when disturbed, and the neutral can be smaller than the active.
What it means: the board and the cable feeding it are separate questions, and the second one is where an upgrade sometimes gets bigger.
Who is allowed to do the work
This is where most articles on the subject get vague, so here it is plainly.
Replacing a switchboard on an existing, unchanged supply is ordinary licensed electrician work. You do not need a Level 2 ASP for that, and you should not be told you do.
It becomes Level 2 work when the job touches the connection, which in practice means any of these:
- the consumer mains feeding the board are being replaced or upsized
- the supply capacity is increasing, or going from single phase to three phase
- the metering is being altered, moved or replaced
- the supply has to be disconnected and reconnected at the network side to do the work safely
- the board is being moved to a new position
On older Sydney housing the board very often sits beside the meter, and the mains are original. That is why a switchboard job on a pre-1980s house frequently does turn out to need a Level 2 ASP, while the same job on a 2010 house usually does not. It is worth establishing which you are before the day rather than on it.
The two documents a compliant job produces
Ask about paperwork, because it is the easiest thing for a customer to verify and the hardest thing to fake.
A CCEW, a Certificate of Compliance for Electrical Work, is issued by the licensed person who did the work. It certifies the work was tested and complies. It must be lodged within 7 days of the safety and compliance test, and from 1 July 2026 lodgement is online only, through the Building Commission NSW eCert portal. You get a copy. An unlicensed person cannot issue one, which makes "will I get a CCEW?" a genuinely useful question to ask a quoting electrician.
Where the job also involved the network connection, a NOSW, a Notification of Service Work, goes from the Level 2 ASP to the distributor. That is a separate document with a separate purpose, and a Level 2 job normally generates both.
What actually moves the price
We do not publish a figure, because the honest answer is that the board is often the cheapest part of the job. What changes the number is:
- whether the consumer mains are being replaced as well, and their length and route
- whether metering work is involved, and whether the distributor has to attend
- whether an outage has to be arranged, and when
- asbestos identification and handling, where a backing panel is present
- the number of circuits being carried over, and whether any need rectifying to be reconnected
- access, and whether the board is being relocated rather than replaced in place
A quote given over the phone from a photograph is a guess. A quote after somebody has had the cover off is a price.
Frequently asked questions
Is an old switchboard illegal? No. An installation is generally assessed against the rules that applied when it was installed, so an older board is not unlawful for being old. What creates an obligation is a defect, an unsafe condition, or work that brings part of the installation into scope for current requirements.
Do I need to upgrade my switchboard to install solar or an EV charger? Sometimes, but not automatically, and for a different reason than people expect. The question is whether the existing supply and board can carry the new load alongside everything else, which is a maximum demand calculation. Plenty of installations need nothing done. Others need the mains addressed rather than the board.
Can I test my own RCD? Yes, and you should. Press the test button; the switch should trip immediately. Reset it afterwards. If it does not trip, it is not protecting anything and needs attention. Doing this every few months is reasonable.
What if my board has no labelling? Common on older boards, and worth fixing at the next opportunity. An unlabelled board means nobody can isolate the right circuit quickly, which matters most in exactly the situation where speed helps.
Does a switchboard upgrade need a distributor outage? Only where the work affects the supply side. A like for like board replacement on an unchanged supply usually does not. Where the mains or metering are involved, an outage is normally arranged, and that scheduling is often what sets the date rather than the electrical work.
Getting it assessed
If two or more of the six signs above describe your board, it is worth having someone look at it properly. We will tell you which parts genuinely need work and which do not, including when the answer is that you need an ordinary electrician rather than us.
We are accredited Level 2 ASPs under the NSW Government's ASP Scheme, authorised to work on the distribution network, with 15 years on connection-side work and a Lifetime Labour Warranty on what we do.
Call 0485 824 714. Quotes are free, and we cover Sydney and the Blue Mountains across both the Ausgrid and Endeavour Energy networks.
Keep reading
More Level 2 guides
What Is Actually Inside a Pre-1990 Switchboard
The board on an older Sydney house is usually the least interesting part of the job. What sits behind it, and what feeds it, is where the work actually is.
How to Check a Level 2 Electrician Is Actually Accredited
Anyone can put "Level 2" on a van. The accreditation behind it is a public record, which means you can check it in a few minutes rather than take somebody's word for it.
