Continuity Test & IR Test Before UG Cable Charging
Before energizing any Underground (UG) cable, two important tests are performed to ensure safety and reliability.
✅ Continuity Test
This test checks whether the cable conductor is properly connected from one end to another without any break.
Process:
✔ Isolate the cable
✔ Short one end of conductor
✔ Check resistance using Multimeter/Ohmmeter
Low resistance means cable continuity is OK.
✅ IR Test (Insulation Resistance Test)
This test checks the insulation health between:
Phase to Phase
Phase to Earth
Process:
✔ Isolate and discharge cable
✔ Connect Megger leads
✔ Apply test voltage
✔ Record IR value in Mega Ohms (MĪ©)
Higher IR value indicates healthy insulation.
Why These Tests Are Important?
✔ Prevent cable failure
✔ Improve system reliability
✔ Detect insulation damage
✔ Ensure safe energization
✔ Important for QA/QC & commissioning
Small tests today can prevent major electrical failures tomorrow.
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