Your consumer unit — often called a fuse box or fuse board — is the nerve centre of your home's electrical system. When it starts to fail, the warning signs aren't always obvious. Ignoring them can be costly, and in some cases, genuinely dangerous. Here are the five key signs it's time to get yours replaced.
Consumer unit technology has changed significantly over the past two decades. Modern units come equipped with RCDs (Residual Current Devices) that protect you from electric shocks and electrical fires in ways that older units simply can't. According to Electrical Safety First, electrical fires cause thousands of house fires in the UK each year — and many are preventable with an up-to-date consumer unit.
If you open your consumer unit and see small ceramic fuses with wire running through them, your system is outdated. These rewireable fuse boards were the standard in homes built before the 1980s, but they offer none of the safety protections that modern units provide.
Rewireable fuse boards have no RCD protection, meaning they cannot detect dangerous fault currents fast enough to prevent a serious electric shock or fire. They also have a habit of being incorrectly repaired with the wrong fuse wire — increasing the risk of fire significantly.
Not sure what type you have? Open the fuse board cover and look inside. Rewireable fuses look like small cylinders in a row. Modern units have plastic breaker switches that flip up and down.
An RCD (Residual Current Device) is a life-saving safety device that cuts power within milliseconds if it detects a fault current. Current UK wiring regulations (18th Edition BS 7671) require RCD protection for most circuits in a home — particularly bathrooms, kitchens, outdoors, and any socket circuit.
If your consumer unit was installed before the regulations were updated, it may have no RCDs at all, or only cover some circuits. You can check for RCDs by looking for a button labelled "TEST" on your consumer unit.
⚠️ Important: A lack of RCD protection is classed as a C2 (potentially dangerous) finding on an EICR inspection. Remedial work should be carried out without delay.
The occasional tripped breaker isn't unusual — it's the system doing its job. But if your breakers are tripping regularly, refusing to reset, or the same circuit keeps going, there's something more serious going on.
Frequent tripping can indicate: an overloaded circuit, a faulty appliance, wiring that has deteriorated, or a failing MCB within the consumer unit itself.
Unplug every appliance on the circuit, reset the breaker, then plug them back in one at a time. If it trips again with nothing plugged in, the issue is in the wiring or board — not your appliances.
This one is serious. A burning smell near your consumer unit, discolouration of plastic covers, or visible scorch marks are all signs of overheating — and potentially a fire hazard.
Causes include loose connections (which cause arcing), components working beyond their rated capacity, or insulation on wiring that has degraded over time.
⚠️ If you smell burning from your consumer unit right now: turn off your mains switch immediately and do not restore power until a qualified electrician has inspected it.
Homes built 20–30 years ago were designed with very different electrical demands in mind. Today that same home could be running EV chargers, home offices, heat pumps, and smart home systems. An old consumer unit may not have enough circuits — or the right type — to handle this safely.
A consumer unit upgrade can actually increase your property value and make it easier to sell — buyers increasingly ask for evidence of a modern electrical installation.
A consumer unit replacement in Port Talbot typically costs £500–£900 fully installed, depending on property size and number of circuits. The work must be carried out by a registered electrician and notified to Building Control under Part P of the Building Regulations.
We'll inspect your fuse board and give you an honest, no-obligation assessment. Clear advice on whether an upgrade is actually needed, and how much it'll cost.
Book a Free Assessment📞 07446 285782