Locating faults in electrical cables is both a technical and safety-critical task. Whether in homes, commercial buildings, or underground networks, faulty cables can cause everything from intermittent power loss to major electrical hazards. At RCD Electrical, our certified electricians specialise in identifying and resolving cable faults using advanced testing equipment and decades of expertise. This article walks you through the full process of professional cable fault location, the tools used, and the techniques that ensure accuracy and safety every step of the way.
Understanding What Constitutes a Cable Fault
Cable faults typically occur due to insulation breakdown, physical damage, corrosion, water ingress, or overloading. Common symptoms include tripped breakers, flickering lights, non-functioning outlets, or an entire circuit going dead. Faults may be categorised into three main types:
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Open Circuit Faults – where the conductor is broken or disconnected
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Short Circuit Faults – where the conductors touch each other or earth
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High Resistance Faults – often caused by damaged insulation or poor connections
Each of these faults requires a different approach to accurately detect and repair.
Step-by-Step: How RCD Electrical Detects Cable Faults
At RCD Electrical, our engineers follow a structured, precise methodology for cable fault location:
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Visual Inspection & Safety Check
Before applying any instruments, we inspect the cable route visually for signs of wear, scorching, impact, or water damage. We also ensure that the area is safe, de-energised, and properly isolated.
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Continuity & Insulation Resistance Testing
Using an insulation resistance tester, we evaluate whether there is leakage current flowing through the insulation. Continuity tests check for open circuits and help to confirm whether a conductor is completely broken.
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Time Domain Reflectometry (TDR)
This advanced method sends a pulse down the cable and analyses the reflected wave to determine where the fault lies. The distance to the fault is calculated based on how long it takes the pulse to bounce back. It's highly accurate, especially for buried or inaccessible cables.
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Thumping or Surge Testing
For high-voltage faults, a surge generator (thumper) can be used to create a breakdown at the point of failure. The resulting noise or vibration can be detected above ground with acoustic devices. This is particularly useful in long underground cables.
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Cable Route Tracing & Mapping
To locate the exact path of the cable (especially if it’s underground or behind walls), we use electromagnetic locators. Once the route is known, pinpointing the fault is quicker and more efficient.
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Fault Confirmation and Repair
Once the fault's location is verified, the damaged cable section is either repaired or replaced. All repairs are followed by a final round of safety and insulation tests to confirm restoration.
Why Professional Fault Finding Matters
Attempting to find or fix a cable fault without proper training or tools can be dangerous and lead to further damage or risk of electric shock. At RCD Electrical, our NICEIC-approved electricians are trained in the latest fault detection technologies, ensuring both precision and safety. Moreover, accurate fault finding minimises disruption and avoids the unnecessary cost of replacing entire cable runs.
Domestic & Commercial Cable Faults – We’ve Got You Covered
Whether you’re a homeowner facing sudden socket outages or a commercial property manager dealing with recurring electrical issues, our team is fully equipped to handle every scenario. We offer:
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Emergency cable fault finding services
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Testing and tracing of both buried and exposed cables
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Comprehensive reporting and repair recommendations
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Full certification and NICEIC-backed safety compliance
Why Choose RCD Electrical?
We’re not just any electrical service. With years of hands-on experience, industry-grade diagnostic tools, and a commitment to safety and precision, RCD Electrical delivers trustworthy fault-finding services in your area. Every visit includes detailed communication, clear pricing, and guaranteed workmanship.
Call RCD Electrical today on 02034882928
Email: info@rcdelectrician.co.uk
Let our experts identify the problem before it becomes a serious hazard.