Rolec
Nuisance RCD Tripping / Earth Leakage
Charger trips the house RCD or RCBO as soon as a vehicle is plugged in or charging starts.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Cumulative earth leakage from multiple circuits plus EV charger, Faulty internal RCD or DC leakage sensor in Rolec unit, Moisture ingress in charger enclosure or cable, Incorrectly shared neutral with other circuits
How to Fix / Troubleshooting
Safety first: Repeated RCD tripping indicates potential leakage. Do not bypass RCD protection.
- Isolate other loads: Turn off other high‑leakage appliances (e.g., old fridges, IT equipment) and test the charger again to see if combined leakage is the issue.
- Inspect for moisture: Check the Rolec enclosure, glands, and cable entry points for water ingress. Dry thoroughly and reseal with appropriate gaskets or glands.
- Check neutral routing (electrician only): Ensure the EV charger’s neutral is not shared with other circuits and passes through the same RCD/RCBO as its line conductor.
- Test internal RCD: Use an RCD tester to verify trip thresholds. Replace the internal RCD/RCBO module if it trips below its rated current or behaves erratically.
- If unresolved: A detailed insulation resistance and leakage test of the charger and cable is required by a qualified electrician.
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Repair Difficulty
Professional Required
5/5
Required Part
Internal RCD / RCBO module
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