Why This Matters to You
Nobody looks at their switchboard until something stops working. It sits in a cupboard or on an outside wall, and as long as the lights come on it's easy to assume it's fine.
The problem is that a switchboard is the one part of your electrical installation whose whole job is to protect you, and the standard of protection it provides depends entirely on when it was built. A board from 1975 isn't a worse version of a modern board. It's a board designed before the protection you now rely on existed at all.
These are real boards from recent jobs around Golden Grove, Ridgehaven and Greenwith. Here's what each one tells you, and what to look for on your own.
Rewireable Fuses
The board in the photo at the top of this page has white ceramic fuse carriers labelled by hand, one for lighting and one for the stove, on a slate panel with an old enclosed main switch above it.
A fuse like that protects the cable in your wall from carrying more current than it should. That's genuinely useful and it's why the house hasn't burnt down. What it doesn't do is protect a person. It has no mechanism for detecting current leaking to earth through somebody, which is the thing that actually kills people. That protection is what a safety switch does, and boards of this era were built before it was required.
There's a second problem specific to rewireable fuses. The fuse wire is replaceable, which means over fifty years somebody has almost certainly replaced one with whatever gauge was in the drawer. A fuse rewired with heavier wire than it should have quietly stops protecting the cable it was installed to protect, and nothing about the board's appearance tells you it has happened.
One Safety Switch Covering Everything
The second photo below is a more modern board, and at a glance it looks fine. Neat row of breakers, printed labels, solar connected. Look at the labels though and there's a single "earth leakage main switch" sitting across the whole installation.
That's one safety switch protecting every circuit in the house. It meets the requirement it was installed under, and it's far better than nothing. But it has two consequences you live with daily.
The first is that a fault anywhere takes out everywhere. A failing outdoor light, a wet powerpoint or a dying appliance trips the lot, so you lose the fridge, the freezer, the internet and every clock in the house because of a fault in one fitting. The second is that it makes the fault almost impossible to identify. When everything goes off together, nothing has been narrowed down.
The modern arrangement puts individual protection on each circuit instead. A fault on the outdoor lights trips the outdoor lights. Everything else keeps running, and you already know where to look. More on how these are tested is on our safety switches and RCD testing page.
Circuits That Keep Tripping
A breaker or safety switch that trips repeatedly isn't being oversensitive and it isn't worn out. It's reporting something.
Resetting it's the equivalent of turning off a smoke alarm rather than looking for the smoke. Sometimes the cause is trivial and sometimes it's a cable sitting in wet ground, but either way the device is doing its job and the answer is to find out what it is detecting.
Other Things Worth Looking For
Beyond what's in these photos, these are the signs that come up most often on boards around here. None of them require you to open anything, and you shouldn't.
Hand-written or missing labels. The third photo has labels in marker pen and breakers from several different decades sitting side by side. That's a board that has been added to piece by piece rather than planned. The practical cost is that nobody can isolate the right circuit quickly, including whoever turns up in an emergency.
No spare space. If the board is physically full, then the next thing you want, an EV charger, ducted air conditioning, a pool, quietly becomes a board replacement rather than a new circuit. This is worth knowing before you buy the equipment, not after.
Any sign of heat. Discoloured or brittle insulation, brown marks around terminals, or a faint smell of hot plastic. This one isn't a plan-for-it item. That's a call-someone-now item.
Solar bolted onto an old board. Solar adds a second supply and its own main switch. Where that has been added to a board which was already at the end of its life, the whole arrangement is worth a proper look rather than just the solar part.
Age alone, if the board is pre-1980s. Boards from that era sometimes have backing panels containing asbestos. It doesn't make your house dangerous to live in, but it does change how the work has to be done, and it's one of several reasons a board isn't somewhere to experiment.
What To Do About It
None of this is a reason to panic. Plenty of old boards are working exactly as designed, and an upgrade is planned work rather than an emergency unless you're seeing heat.
The sensible trigger is when you're about to do something else. A renovation, an EV charger, air conditioning or a pool all need capacity and protection the old board may not have, and doing the board at the same time avoids paying twice for access. Our switchboard upgrades page covers what the work actually involves, and there's more on what we do locally on our Golden Grove electrician page.
