Types of Fault Detectors The devices vary depending on the nature of the cables (domestic, industrial, or buried underground): Cable Trackers: Such as the Wire Tracker or UNI-T UT682 device, used to detect the path of hidden wires behind walls and accurately identify shorts and breaks using audio and visual signals. Insulation Resistance Testers (Megger): Used to diagnose the condition of cable insulation and ensure its integrity, as they detect any current leakage resulting from damage to the insulating layer. Time Domain Reflectometers (TDR): Ideal for long and buried cables, as they send electrical pulses and rely on their reflection to determine the fault distance with extreme accuracy.