EO Charging
Earth Leakage on Output / Nuisance RCD Tripping
EO charger trips the upstream RCD/RCBO as soon as a vehicle is plugged in.
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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
Combined leakage from EV and charger exceeding RCD rating, Incorrect RCD type (e.g., Type AC instead of Type A or B), Moisture in Type 2 connector or cable, Internal insulation fault in charger
How to Fix / Troubleshooting
Safety first: Repeated RCD tripping indicates a potential shock hazard. Do not bypass or replace with a higher‑rated RCD without proper assessment.
- Test without EV: Reset the RCD and power the EO charger with no vehicle connected. If it holds, the leakage may be primarily from the EV or cable.
- Dry and inspect connectors: Check the Type 2 plug and socket for moisture and dry thoroughly. Replace any cracked or damaged connectors.
- Check RCD type and rating: Verify that the upstream RCD/RCBO is of the type and rating specified by EO (typically Type A or B, with appropriate current rating).
- Try another EV or cable: If possible, test with a different vehicle and/or cable to isolate the source of leakage.
- Insulation testing (electrician): Have an electrician perform insulation resistance tests on the charger circuit and cable. Replace any components with low insulation resistance.
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Repair Difficulty
Hard
4/5
Required Part
Type 2 connector assembly
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