Kiwi homes are asking more of their electrical systems than ever. A heat pump in the lounge, an induction cooktop in the kitchen, an EV charging in the garage, and maybe solar panels on the roof. Every one of those upgrades ends up in the same place: your switchboard.
If your house was built a few decades ago, the switchboard was designed for a very different lifestyle. Here’s how to tell whether yours is up to the job, what New Zealand’s rules say, and why it’s worth sorting before you add that next big appliance.
What your switchboard actually does
Your switchboard (or distribution board) is where power from the street is split into separate circuits around the house. Each circuit has a protective device: a fuse in older boards, or a circuit breaker in modern ones. Its job is to cut the power when something goes wrong, such as an overload or a short circuit.
Modern boards also include residual current devices (RCDs). An RCD watches for electricity leaking where it shouldn’t, such as through a person, and disconnects the supply in a fraction of a second. It’s one of the most important safety features you can have in a home.
Signs your switchboard needs attention
You don’t have to be an electrician to spot some of the warning signs:
- Ceramic rewireable fuses. If you replace fuse wire when the power goes, your board is well overdue for a look.
- No RCD protection. Older boards often have none, or only cover part of the house.
- Breakers that trip often. This can mean circuits are overloaded or a fault is developing.
- Heat, buzzing or a burning smell. These mean you should call an electrician straight away.
- No spare space. If there’s no room for new circuits, adding a heat pump, EV charger or solar system means changing the board.
- Old materials or signs of damage. Some older boards are mounted on materials that can contain asbestos. Don’t disturb them yourself. A professional needs to assess them.
Why new loads change the picture
EV chargers. A dedicated wall charger draws a large, steady current for hours at a time, often overnight. It needs its own circuit with the correct protection, and an electrician has to check that your supply and board can handle it on top of your normal household use.
Heat pumps. Heat pumps are a great way to warm a home through a New Zealand winter, but larger units or several units spread around the house add a lot of load. They usually need their own dedicated circuits too.
Solar power. A grid-tied solar system connects back into your switchboard through an inverter. The installation has to meet AS/NZS 5033 (PV arrays) and AS/NZS 4777.1 (inverter connection). The switchboard needs suitable space, labelling and protection for that connection. Many older boards simply can’t meet these needs without an upgrade.
If you’re planning more than one of these upgrades, it’s usually cheaper and neater to do the switchboard once, with room to grow, rather than patching it each time.
What NZ rules say
In New Zealand, electrical safety is governed by the Electricity Act 1992 and the Electricity (Safety) Regulations 2010. The Regulations cite AS/NZS 3000 (the Wiring Rules) as the main standard for electrical installations.
A few key points for homeowners:
- Switchboard work is prescribed electrical work. It must be done by a licensed electrician registered with the Electrical Workers Registration Board (EWRB). It isn’t a DIY job.
- You should get a Certificate of Compliance (CoC). Your electrician issues one for prescribed electrical work. It’s your proof that the work meets the required standards, and it’s useful for insurance and when you sell the house.
- Grid-tied solar needs a specialist endorsement. Under the Regulations, mains parallel generation work like solar has to be done and certified by an electrician who holds the EWRB’s Mains Parallel Generation endorsement.
- Current standards expect RCD protection. For new work, the Wiring Rules require RCD protection on the circuits that matter most, including socket outlets and lighting in homes. Upgrading an old board is a good chance to bring that protection right through the house.
You can check whether an electrician is licensed on the EWRB’s public register. WorkSafe also has general electrical safety information for homeowners.
What a switchboard upgrade involves
Every house is different, but a typical upgrade looks like this:
- Assessment. We look at your existing board, your wiring, your supply and what you’re planning to add.
- Design. We size a new board for today’s load and leave spare room for future circuits such as solar, an EV charger or extra heat pumps.
- Installation. We replace the old fuses with modern circuit breakers and RCD protection, then label everything clearly.
- Testing and certification. We test each circuit, and you get a Certificate of Compliance.
Most residential upgrades are done in a day. The power is off for part of that time, and we’ll agree on the timing with you upfront.
FAQ
How do I know if my switchboard is too old? Rewireable fuses, no RCDs, frequent tripping or no spare space are all strong signs. A licensed electrician can tell you for sure.
Do I have to upgrade my switchboard before installing solar? Not always, but many older boards don’t have the space or protection needed for a compliant solar connection. We check this as part of every solar quote.
Can I install an EV charger on my existing board? Sometimes. It depends on your board’s capacity, your supply and your existing load. A dedicated circuit is needed either way.
Will I get a Certificate of Compliance? Yes. A CoC is issued for all prescribed electrical work we complete.
Get your switchboard checked
Thinking about solar, an EV charger or a heat pump? Let’s make sure your switchboard is ready first. Brady Electrical is a team of licensed Auckland electricians serving the North Shore and beyond. We provide upfront quotes, a 12-month workmanship guarantee on quoted work, and a Certificate of Compliance for every job.
👉 Explore our solar and switchboard services or contact us for a quote. For urgent work, call 0210 265 4778.