The best and systematic process for electrical wiring fault detection — followed by professional electricians for homes or offices Near Butwal, bahirahwa and parasi 1. Safety First Turn off the main power supply before starting inspection. Use insulated tools, rubber gloves, and safety shoes. Keep a multimeter or test lamp ready for testing. 2. Visual Inspection Check for burnt smell, discolored switches, or melted insulation. Inspect loose connections in switchboards or junction boxes. Look for signs of moisture or water leakage near wiring points. 3. Power Supply Verification Turn power ON and check voltage at: Main MCB output Switchboard input terminals Sockets and points Use a multimeter or test pen to verify presence of phase (live) voltage. 4. Continuity Testing (Power OFF) Turn OFF power again. Use the continuity mode of a multimeter to check: Broken live, neutral, or earth wires Faulty switch or loose terminal Open circuit in light or socket line 5. Short Circuit or Ground Fault Detection Measure resistance between live and neutral, and live and earth. If resistance is very low → possible short circuit. Use megger (insulation tester) to test insulation resistance between wires (should be above 1 MΩ). Isolate the faulty circuit by switching off one MCB at a time to narrow down the zone. 6. Load Testing Turn ON power and connect known load (like bulb or heater). Observe if voltage drops, fuse blows, or breaker trips — this helps locate weak points or overload faults 7. Specific Fault Indicators Symptom Possible Cause No power at socket Loose wire, tripped MCB, broken neutral Repeated fuse blowing Short circuit or overload Flickering lights Loose neutral or corroded terminals Shock from appliance Faulty earthing or insulation damage Breaker tripping often Overload, short circuit, or faulty MCB 8. Final Verification After fixing the fault, recheck: Proper voltage at all outlets No spark, smell, or heat generation Earthing continuity Label the repaired circuit and document the issue for future reference.