Electrical fault finding is the structured process of identifying exactly where and why an electrical installation has failed or is behaving dangerously. A qualified electrician uses calibrated test equipment, systematic testing procedures, and knowledge of BS 7671 18th Edition Wiring Regulations to locate faults accurately — not by guessing, but by following a logical diagnostic sequence. If your power keeps tripping, you have dead sockets, or you've had an electric shock from a fitting, you need a fault finding electrician before you use that circuit again.
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Electrical fault finding covers any situation where something in your installation isn't working correctly and the cause isn't immediately obvious. That could mean a circuit breaker that keeps tripping, a socket that's stopped working for no apparent reason, lights that flicker intermittently, or an RCD (Residual Current Device) that disconnects everything the moment it rains.
You need a fault finding electrician when:
Waiting on any of the above is not a good idea. Faults don't resolve themselves — they tend to deteriorate.
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Working across Newcastle, Sunderland, Gateshead, Durham, Middlesbrough, and Northumberland, the faults we see most often fall into a few categories:
Nuisance tripping — An RCD or RCBO trips intermittently with no clear trigger. This is often caused by accumulated earth leakage across multiple appliances, a single faulty appliance, or degraded cable insulation allowing current to leak to earth.
Dead sockets — A socket or group of sockets stops working. Common causes include a failed connection at a junction box, a burned-out socket, or a wiring fault causing the MCB (Miniature Circuit Breaker) to trip.
Overloaded circuits — Older properties in the North East — particularly the Victorian and Edwardian terraces common in parts of Sunderland and Gateshead — sometimes have wiring that pre-dates current load expectations.
Water ingress faults — Moisture getting into outdoor sockets, bathroom fittings, or roof junction boxes. These create genuine electric shock risk and cause persistent RCD tripping.
Rodent damage — More common than people expect, particularly in older properties with roof voids.
Faulty appliances causing RCD trips — The installation itself is fine; the problem is a washing machine, dishwasher, or fridge with a degraded heating element or motor winding.
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There's a structured approach to this, and it matters. Here's how we work through a fault diagnosis:
1. Client interview — When did the fault start? What was happening at the time? Has anything changed recently (new appliance, recent work, flooding)? This alone narrows the field significantly.
2. Visual inspection — Check the consumer unit for signs of overheating, scorching, or incorrectly rated breakers. Inspect accessible sockets, switches, and fittings for damage.
3. Isolation and dead testing — Before any live testing, we confirm circuits are safely isolated. This protects both the electrician and the installation.
4. Insulation resistance testing — Using a multifunction installation tester (typically a Megger or equivalent), we test insulation resistance between conductors and earth. Readings significantly below 1 MΩ (the BS 7671 minimum for a 500V DC test) indicate degraded insulation.
5. Earth continuity testing — Confirming that all exposed metalwork is properly bonded back to the main earth terminal.
6. Loop impedance testing — Measuring earth fault loop impedance to confirm that protective devices will operate within the required disconnection times under IET Guidance Note 3 criteria.
7. RCD testing — Verifying that RCDs trip within the required 300ms at rated tripping current (or 40ms at 5× rated current for socket outlets).
8. Elimination — Systematically disconnecting sections of circuit to isolate which spur, joint, or piece of equipment is responsible.
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All our test equipment is calibrated and used in accordance with IET Guidance Note 3 (Inspection and Testing).
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Electrical fault finding requires working on or near live conductors at various stages. Without training, test equipment, and knowledge of the regulations, the risk of electric shock, arc flash, or making a fault significantly worse is real.
Beyond the safety issue, certain remedial work following fault finding — particularly work on consumer units or new circuit installation — is notifiable work under Part P Building Regulations in England. This means it must be carried out by a competent person registered with a scheme such as NICEIC or NAPIT, or notified to Building Control. Unregistered work can create problems when selling a property and may invalidate your home insurance.
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Straightforward faults — a single tripped MCB with an obvious cause, or a dead socket traced to a loose connection — can be diagnosed and resolved in under an hour. More complex intermittent faults, particularly in larger properties or older wiring systems, can take half a day or more. We'll give you an honest assessment once we've done the initial inspection.
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An EICR is a scheduled, comprehensive inspection and test of an entire installation against BS 7671 18th Edition, resulting in a formal condition report. It's required periodically for rental properties (every five years under current regulations) and is good practice for owner-occupied homes.
Fault finding is targeted and reactive — something is wrong, and you need to find it now. The two often overlap: an EICR might identify a fault that then requires investigation, and fault finding work may prompt us to recommend a full EICR if we find wider issues. They're billed differently and have different scopes.
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Energy North Ltd carries out electrical fault finding across:
If you're not sure whether we cover your area, just get in touch and we'll let you know.
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Once we've identified the fault, we'll explain clearly what it is, what caused it, and what the options are for fixing it. Some repairs are straightforward and can be completed the same visit. Others — particularly where cable replacement is needed through finished walls — require a separate appointment and sometimes some redecoration work afterwards.
We won't pressure you into unnecessary remedial work. If we find a fault and you want a second opinion, that's your right. We'll give you a written summary of our findings.
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Why does my RCD keep tripping and how do I find the cause?
Persistent RCD tripping is usually caused by one of three things: a faulty appliance leaking current to earth, degraded cable insulation creating an earth leakage path, or accumulated leakage from multiple appliances pushing the total beyond the RCD's tripping threshold. To find the cause, an electrician will disconnect loads one at a time while testing insulation resistance on the wiring. Plugging your appliances into another circuit or property temporarily can also help identify whether the appliance or the wiring is at fault — but get a professional to confirm before you assume the installation is clear.
How much does it cost to have an electrician find a fault in North East England?
Most electricians charge either a fixed call-out fee plus hourly rate, or a combined fault finding fee. Realistically, expect to pay somewhere in the range of £80–£180 for the initial investigation, with additional costs if significant remedial work is required. Prices vary between contractors and depend on the complexity of the fault. Be cautious of quotes that seem unusually cheap — proper fault finding takes time and calibrated equipment.
Can an electrician find a fault without turning my power off?
Some initial diagnostics — visual inspection, RCD behaviour checks, socket testing — can be done live. However, safe insulation resistance testing and most detailed wiring checks require the circuit to be isolated and confirmed dead. Any electrician who doesn't isolate before working on wiring is cutting corners in a way that puts both of you at risk.
Is it safe to keep using sockets or lights if I have an electrical fault?
That depends entirely on the nature of the fault, which you don't know until it's been diagnosed. A dead socket on an otherwise healthy circuit is a different situation to intermittent tripping caused by cable insulation failure. As a general rule: if you've had any electric shock, if you can smell burning, or if your RCD is tripping, stop using the affected circuits and get it looked at. The risk of a more serious incident increases the longer a developing fault is left.
Will fault finding work show up on an EICR certificate?
Not directly. An EICR documents the condition of the installation at the time of inspection. If fault finding work is carried out and the remedial repair is completed before an EICR is done, the corrected installation will be tested and reported on. If you need documentation of the fault finding work itself — for insurance purposes, for example — ask for a written report from your electrician at the time.
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If you've got an electrical fault that needs diagnosing in the North East, we're happy to help. You can reach us through our website at [energynorth.uk](https://energynorth.uk). We'll give you a straightforward assessment of what's involved before any work starts.