Why Your Fuse Box Keeps Tripping in Arundel and What to Do About It

Published September 2026 | Why your fuse box keeps tripping and how to fix it

It's Sunday evening, you've just switched the oven on to cook dinner, and the kitchen goes dark. You head to the cupboard under the stairs, flick the tripped switch back up, and ten minutes later it happens again. If this sounds familiar, you're not alone - it's one of the most common electrical problems our engineers deal with in Arundel homes.

Understanding What's Actually Happening in Your Consumer Unit

A consumer unit - what most people still call a fuse box - is the control hub for all the electrical circuits in your home. Inside it you'll find individual circuit breakers, each assigned to a specific part of the house: downstairs ring main, upstairs lights, kitchen sockets, cooker, and so on.

When something goes wrong on one of those circuits, the breaker trips - it switches itself off to cut the power before any damage or danger occurs. This is the system working as intended. The issue isn't the trip itself; it's the fault causing it. Every time you reset the breaker without finding out why it tripped, you're masking a problem that could range from a worn-out appliance to a serious wiring fault in the walls.

Modern consumer units also contain an RCD (Residual Current Device), sometimes called an RCCB. This is a more sensitive device that trips when it detects a tiny imbalance in current - the kind caused by electricity taking an unintended path, such as through a person or through damp. RCDs can cut power to large sections of your home in one go, and when they do, it's worth taking it seriously.

The Most Common Causes of a Tripping Fuse Box

Overloaded Circuits

Circuit overloading is the most common cause our engineers find in older properties around Arundel. Every circuit has a maximum load it can safely carry, measured in amperes. If you plug in too many appliances that collectively draw more current than the circuit is rated for, the breaker trips to prevent the wiring from overheating.

This typically happens in kitchens - where a microwave, kettle, toaster, and coffee machine might all be running at once on the same ring main - and in living rooms where extension leads are stacked to run a TV, games console, speaker system, and a lamp from a single wall socket. If your breaker trips during heavy usage and resets fine once you've unplugged a few things, overloading is the likely culprit.

A Faulty Appliance

A single defective appliance can cause persistent tripping on an otherwise perfectly sound circuit. The fault is usually either a damaged component drawing excessive current, or a break in the internal insulation creating an unintended path to earth.

The way to identify this is methodical: unplug everything on the affected circuit, reset the breaker, then plug appliances back in one at a time and switch each one on before adding the next. When the breaker trips after reconnecting a specific item, that's your culprit. Common offenders include washing machines, dishwashers, tumble dryers, electric heaters, and kettles. Even reliable brands like Hotpoint, Beko, and Bosch can develop internal faults over time - particularly heating elements and motor windings in older machines. If an appliance is consistently tripping your circuit, it typically needs a service or replacement rather than any work on the wiring itself.

A Short Circuit

A short circuit occurs when a live wire comes into contact with a neutral wire where they shouldn't meet - usually inside a socket, a switch, or an appliance. The sudden drop in resistance causes a surge of current that trips the breaker almost instantly, often with a noticeable pop.

Short circuits can produce a burning smell, and you may notice scorch marks around a socket face. They can occur inside the walls, in junction boxes, or at connection points. This is not something to investigate yourself - a short circuit in the wiring needs a qualified electrician with the right testing equipment to locate safely.

An Earth Fault

An earth fault happens when current finds an unintended path to earth - potentially through damp masonry, deteriorating insulation, or in the worst case, through a person. RCDs are specifically designed to detect these and cut the power within milliseconds.

Damp is a significant contributor, particularly in bathrooms and older properties. In a county like West Sussex, where a large proportion of homes pre-date modern wiring standards, earth faults caused by ageing cable insulation are something our engineers encounter regularly. If your RCD trips when it's raining heavily or when the bathroom is in use, damp ingress is worth investigating.

An Ageing or Deteriorating Consumer Unit

Consumer units don't last indefinitely. Older fuse boards - particularly those with rewirable ceramic fuses rather than modern MCBs (Miniature Circuit Breakers) - can become unreliable with age. Some older MCBs also wear out and start tripping at lower thresholds than they should, causing trips that aren't linked to any real fault on the circuit. If your consumer unit is more than 25 years old or still uses the old ceramic fuse holders, it's likely overdue replacement regardless of the tripping issue.

RCD Nuisance Tripping

RCDs are sensitive by design, and in some cases they trip without there being a clear, obvious fault. This is known as a nuisance trip. Certain appliances - older washing machines, some power tools, fluorescent lighting - can cause a brief earth leakage that triggers an RCD even when the appliance itself is functioning normally. Long cable runs and damp conditions in older properties can contribute to this too.

Persistent RCD nuisance tripping should still be investigated by an electrician. Distinguishing between a genuine fault and a true nuisance trip requires insulation resistance testing, not guesswork.

Solutions That Actually Work

Here's what to do when your consumer unit keeps tripping, starting with the steps you can safely take yourself before bringing anyone in.

1. Identify which breaker has tripped. Open your consumer unit and look for the breaker that's no longer in the fully upright "on" position. Most modern MCBs sit clearly at a halfway or "off" position when they've tripped. Note which circuit it's protecting - there should be a label inside the unit door.
2. Unplug everything on that circuit. Go around the relevant rooms and unplug every appliance. For a kitchen circuit, that means everything - kettle, toaster, microwave, and anything else plugged in.
3. Reset the breaker. Push it fully to off, then back to on. If it trips immediately with nothing connected, there's a wiring fault and you need an electrician - stop here.
4. Add appliances back one at a time. Plug each appliance in and switch it on before adding the next. When the breaker trips again, the last item you connected is your likely culprit.
5. If an appliance is to blame, don't continue using it. Have it checked or replaced. Even intermittent appliance faults can become serious over time.

If the issue is an overloaded circuit rather than a fault, the solutions are to redistribute your appliances across multiple circuits, or to have a dedicated circuit installed for high-draw appliances such as a tumble dryer, electric shower, or range cooker. A qualified electrician can advise on the most cost-effective option for your home.

For anything you can't identify through the steps above - and for any wiring faults, earth faults, or recurring RCD trips - stop there and call a professional.

When You Need a Professional vs When You Can Sort It Yourself

There's a clear line between what's safe for a homeowner to do and what requires a Part P registered electrician.

You can safely do the following without any qualifications: unplug appliances, test which circuit is tripping, identify a faulty appliance using the unplug-and-reconnect method, and visually check that sockets and switches aren't scorched or cracked.

You need a professional when any of the following apply:

• The breaker trips immediately with nothing connected to the circuit
• You can smell burning from a socket, switch, or from the consumer unit itself
• The consumer unit feels warm to the touch
• An RCD keeps tripping and you can't identify a cause
• The same breaker has tripped multiple times and you can't pinpoint the fault
• Your consumer unit is an old-style board without MCBs or RCD protection
• You've noticed flickering lights, buzzing from sockets, or any other electrical irregularities alongside the tripping

In West Sussex, all electrical installation work that falls under Part P of the Building Regulations must be carried out by a registered electrician or formally notified to the local authority. This covers consumer unit replacements, new circuits, and any work in kitchens and bathrooms. Apart from the safety implications, unauthorised electrical work can cause significant problems when you come to sell the property - solicitors and buyers' surveyors will ask for certification.

What to Expect from a Repair Visit

If you've called an electrician to an Arundel property for a tripping fuse box, here's what that visit will typically involve.

First, the engineer will want to understand the history: how long it's been tripping, which circuit, under what conditions, and what you've already tested. If you've done the unplug-and-reconnect method, tell them upfront - it saves time and helps them focus their investigation.

They'll then carry out formal testing using an insulation resistance tester and loop impedance tester. These measure the condition of the wiring and locate faults far more precisely than visual inspection alone. Our engineers use the Voltrade GoFIX diagnostic workflow to log test results and ensure nothing is overlooked during the inspection, which also means you get a clear written record of what was found and what was done.

If a faulty appliance is the cause, the visit is typically short - under an hour in most cases. Costs are mainly the call-out and testing time, which commonly runs between 70 and 150 pounds for a standard diagnostic visit.

If a wiring fault is found, repair costs depend on what needs doing. Replacing a faulty socket or junction box typically runs between 80 and 200 pounds including parts. If a section of cable in the wall needs replacing, expect 200 to 500 pounds or more, depending on access and the extent of the damage.

A full consumer unit replacement - which includes fitting a new unit with up-to-date RCD and AFDD protection where required - typically costs between 500 and 900 pounds for a standard domestic installation in this part of West Sussex. This includes the Part P Building Regulations certificate the installer is required to provide.

If you're in an Arundel property with older wiring and recurring electrical problems, it's worth asking the electrician to carry out a full Electrical Installation Condition Report (EICR) at the same time. EICRs commonly cost between 150 and 300 pounds for most homes and give you a clear graded assessment of the overall wiring condition - which can prevent more expensive problems further down the line.

Common Questions from Arundel Homeowners

How do I find out which circuit in my fuse box is tripping?

Open the consumer unit door and look for a breaker that's no longer in the fully upright "on" position - it'll either be at the halfway mark or have dropped to "off". Most modern units have circuit labels printed on a card inside the door. If yours isn't labelled, an electrician can map and label your circuits while they're on site. It's a small job that makes future fault-finding much quicker and is worth doing if your labels are missing or illegible.

Is it safe to keep resetting a tripped circuit breaker?

Resetting once to test is fine and is part of the diagnostic process. But repeatedly resetting a breaker without understanding why it's tripping is not a good idea. If the fault is a wiring issue or an earth fault, each reset re-exposes the circuit to conditions that could cause overheating or a shock risk. Treat a persistently tripping breaker as a warning that something needs investigating, not a routine annoyance to override. If it trips more than twice in a short period, call an electrician.

How much does it cost to fix a tripping fuse box in Arundel?

It depends on the root cause. A diagnostic visit to identify the fault commonly runs between 70 and 150 pounds. If the cause is a faulty appliance, you're mainly paying for the diagnosis - the appliance replacement is a separate cost. Wiring repairs typically run from 80 to 500 pounds depending on scope. A full consumer unit replacement in a standard home in the Arundel area usually costs between 500 and 900 pounds, including the required Part P certification.

Does a tripping fuse box mean I need a full rewire?

Not necessarily. A tripping breaker on its own doesn't mean the entire house needs rewiring. Most causes - a faulty appliance, an overloaded circuit, a single damaged cable - can be fixed without wholesale work. However, if the electrician's testing reveals widespread deterioration of cable insulation throughout the property, which is common in homes over 40 years old, they may recommend a full rewire as the safest long-term option. An EICR will tell you clearly where you stand before any decisions are made.