Switchboard Upgrades: When Do You Need One?
Last updated June 2026. The signs a switchboard needs upgrading, what's involved and how it's sized. A switchboard upgrade must be carried out by a licensed electrician.
Signs you need a switchboard upgrade
- Ceramic rewireable fuses — the old porcelain fuse holders with fuse wire. Outdated and no match for modern loads.
- No RCDs (safety switches) — if there are no test buttons, the board has no residual-current protection.
- The board is full — no spare ways to add a circuit for an EV charger, air-con or a renovation.
- Nuisance tripping or flickering — a board working beyond its capacity.
- You're adding major load — EV charging, ducted AC, induction cooktop, solar or a battery often forces an upgrade.
- Asbestos backing panel — common on older boards and a reason to replace properly.
- A rewire or major reno — the natural time to bring the board up to current standards.
What's involved in a switchboard upgrade?
A licensed electrician arranges supply isolation (often with the network), removes the old board and fits a new distribution board / enclosure with:
- A main switch (and surge protection if specified)
- RCBOs — combined RCD + circuit breaker — on the circuits, the modern approach to meeting RCD rules
- Properly rated busbars, neutral and earth links
- Clear circuit labelling and testing/certification
New circuits added during a renovation generally trigger RCD protection requirements under AS/NZS 3000 — see our explainer on RCD vs RCBO vs MCB.
24 Pole Surface-Mount Distribution Board
Plenty of ways for a modern home with room to grow. Also in 12, 36 pole and IP66.
$44.00 View product →
NHP MOD6+ RCBO (6kA, 1 Pole)
Combined RCD + breaker per circuit — the modern way to meet RCD requirements.
$36.90 View product →How is a switchboard sized?
The board is sized by the number of circuits ("ways" or "poles") plus headroom for the future. A good rule is to leave 20–30% spare ways so the next circuit — an EV charger, a studio, a pool — doesn't mean another upgrade.
| Board size | Roughly suits |
|---|---|
| 4–6 pole | Small unit, granny flat, sub-board |
| 12 pole | Smaller home |
| 24 pole | Typical modern family home |
| 36 pole | Large home, lots of circuits / future loads |
Outdoor or exposed boards should be an IP-rated enclosure (e.g. IP66). Your electrician confirms the right size and rating for the installation.
Browse switchboard gear at ARCK
We stock distribution boards and enclosures (4 to 36 pole, surface, recessed and IP66) plus RCBOs, main switches and accessories at trade prices. Tell the trade counter your circuit count and we'll help you spec the board.
Frequently asked questions
How do I know if my switchboard needs upgrading?
Tell-tale signs are ceramic rewireable fuses, no RCD safety switches (no test buttons), a board with no spare ways, frequent tripping, or plans to add a big load like an EV charger or ducted air-conditioning.
Is a switchboard upgrade a legal requirement?
There's no blanket rule to upgrade an existing compliant board, but once you add or alter circuits, the new work must meet AS/NZS 3000 — which usually means RCD protection and often a board upgrade. A licensed electrician will advise.
Do I need RCDs on every circuit?
Modern installs use an RCBO (combined RCD + breaker) per circuit so every final sub-circuit is protected. The exact requirement depends on the circuits being added or altered under AS/NZS 3000.
How many spare ways should a new board have?
Leave around 20–30% spare ways. It costs little upfront and saves a second upgrade when you next add a circuit such as an EV charger or air-conditioner.
Planning an upgrade? Call the trade counter on (02) 9890 9693 or drop in to 589 Church St, North Parramatta. Order online for free Click & Collect, with metro delivery from $19.90 calculated at checkout.
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