This practical guide shows you how to complete a signed, QR-verified EV Charger (EVSE) Station Inspection certificate in OhmCert Module #13 and how to troubleshoot non-compliant readings on site.
1. Step-by-Step OhmCert UI Workflow
- Open Module #13: Navigate to EV Charger (EVSE) Station Inspection from the Dashboard.
- Load a 1-Click Standard Annex Preset: Open the blue Standard Annex banner at the top and click a preset (such as "22 kW 3-Phase AC Commercial Charger (32A Type C MCB, Im=320A)") to populate target limits automatically.
- Enter Your Field Measurements: Fill in the measured inputs (Nominal Line-to-Earth Voltage Uo, Measured Loop Impedance Zs, Protective Device Trip Current Im, RCD Trip Time at 1x IΔn, RCD Trip Time at 5x IΔn, DC Residual Detection Threshold, Insulation Resistance, Earth Electrode Resistance, Rated Charging Power). Blank inputs stay neutral
PENDING. - Complete the 16-Point Checklist: Grade each item, attach photos if needed, and export the SHA-256 signed PDF certificate.
2. Worked Numerical Field Case Study
Scenario: 22 kW 3-Phase AC Commercial Charger (32A Type C MCB, Im=320A) (IEC 61851 Mode 3 (22kW)) — 3-phase 400/230 V, 22 kW (32 A per phase), C32 MCB (Im=320 A), Type A RCD + 6 mA RDC-DD..
- Nominal Line-to-Earth Voltage Uo:
230 V - Rated Charging Power:
22 kW - Protective Device Trip Current Im:
320 A - RCD Trip Time at 1x IΔn:
24 ms - RCD Trip Time at 5x IΔn:
18 ms - DC Residual Detection Threshold:
4.8 mA - Insulation Resistance:
250 MOhm
3. Engineering Troubleshooting: Corrective Actions When a Reading Fails
- Upgrade upstream protection to a Type B RCD or a Type A RCBO paired with a certified IEC 62955 6 mA RDC-DD.
- Install an automatic open-PEN detection unit (disconnecting L, N, and PE within 5 s if U_L-E < 70V or > 253V) or convert the charger to a local TT earth electrode.
- Install crash bollards / wheel stops where parking bay chargers lack IK10 impact protection.
→ Try This Worked Example Live in Module #13 (EV Charger (EVSE))