Electrical faults, whether they cause flickering lights, dead sockets, or persistent tripping, can disrupt daily life and pose serious safety risks. Fortunately, identifying the root cause of circuit faults is entirely manageable when approached methodically. At RCD Electrical, we follow a structured, step-by-step procedure to locate electrical faults in domestic and commercial circuits. This article explains how we do it, from first observation to final resolution—keeping you safe, informed, and powered.
What Is an Electrical Fault?
An electrical fault refers to any abnormal condition in a circuit that disrupts the intended flow of electricity. The most common types include:
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Open Circuit – A break in the wiring
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Short Circuit – A direct connection between conductors
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Earth Fault – When current leaks to earth
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Overload – More current than the circuit can safely carry
These issues may trigger warning signs like burning smells, buzzing sounds, scorched sockets, or RCD/MCB tripping.
Step-by-Step Fault-Finding by RCD Electrical
Step 1: Safety First – Power Down the Circuit
Before testing begins, our electricians switch off the relevant circuit and isolate it safely from the mains. Personal protective equipment (PPE) is worn, and test locks or signs are used to ensure no accidental re-energisation.
Step 2: Gather Symptoms and History
We start by speaking to the homeowner or business operator to understand what happened before the fault began. Knowing whether there were sparks, smells, or specific times of failure helps narrow down likely causes.
Step 3: Visual Inspection
A thorough visual inspection is conducted—looking for signs of damage such as:
Faults are often hidden but can sometimes be spotted with the naked eye.
Step 4: Use a Multimeter to Test Continuity
With power isolated, we use a multimeter to test the continuity of the circuit. An open circuit will show no continuity, helping us locate broken wires or faulty connections.
Step 5: Insulation Resistance Testing
To detect if current is leaking where it shouldn’t, we use an insulation tester (megger). If the resistance between live conductors and earth is low, there's likely an earth fault or insulation breakdown.
Step 6: Check for Short Circuits or Line-to-Earth Faults
Short circuits are found when resistance between line and neutral is unusually low. These may be due to melted wiring, trapped cables, or even damaged appliances plugged into sockets.
Step 7: Isolate and Divide the Circuit
To pinpoint the fault, we divide the circuit into sections. For example, we disconnect parts of the ring main or lighting loop to isolate which leg is faulty. This targeted approach allows for rapid localisation.
Step 8: Functional Testing After Repairs
Once the fault is found and repaired—be it a loose terminal, damaged cable, or faulty fitting—we reassemble and re-energise the circuit. Functional testing is performed to confirm all elements are working safely.
Step 9: Issue Report or Certification (if needed)
If the circuit is in a rental or commercial property, we issue a report or update the relevant EICR record, confirming the circuit is safe and compliant.
When Should You Call RCD Electrical?
While some homeowners attempt to find faults themselves, working on live or damaged electrical circuits is dangerous without training. At RCD Electrical, we’re fully NICEIC-certified and use professional-grade tools to detect even the most elusive faults. Whether it's a residential socket issue or a business-wide lighting failure, we’re ready to respond safely and swiftly.
Common Signs You May Have a Fault
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A certain fuse or breaker trips repeatedly
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Sockets or switches feel warm or buzz
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Lights dim or flicker inconsistently
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You receive a mild shock from appliances
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Certain areas have lost power completely
If any of these apply, contact RCD Electrical on 02034882928. We’ll investigate and resolve it before it becomes dangerous.
Why Choose RCD Electrical?
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NICEIC-approved and fully insured
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Decades of practical experience
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Emergency fault-finding service available
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Fixed-price quotes and clear communication
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Serving both residential and commercial customers
Phone: 02034882928
Email: info@rcdelectrician.co.uk
Let us make your property safe and your power reliable again.