How to Locate Cable Faults: Effective Electrical Testing Techniques
Learn cable fault types, test methods (TDR, loop, VLF, PD), workflows, calculations, and safety to quickly find and fix faults.
How to Locate Cable Faults: Effective Electrical Testing Techniques
When a power or control cable fails, every minute counts. Cable fault location combines diagnostic tests and pinpointing techniques to identify the fault type and its exact position so you can restore service fast—without unnecessary digging or downtime. This guide explains fault types, test selection, proven workflows, calculations, tools, acceptance criteria, and safety , with real examples and FAQs. Safety first: High-voltage testing and thumping can be dangerous. Use qualified personnel, LOTO, rated PPE, correct earthing/discharge, and follow local regulations and manufacturer procedures. 1) Cable fault types & symptoms Open circuit (conductor break): Infinite/very high resistance; TDR shows open reflection; capacitance reduced. Short circuit (core-core/core-sheath): Very low resistance; protection trips; TDR shows near-zero impedance reflection. High-resistance joint/partial contact: Intermittent, heat under load; resistance rises with temperature; PD may occur on MV cables. Sheath/…
About the author
Prasun Barua is a graduate engineer in Electrical and Electronic Engineering with a passion for simplifying complex technical concepts for learners and professionals alike. He has authored numerous highly regarded books covering a wide range of elec…
