Testing Charge Points for Electric Vehicles: A Step-by-Step Guidewww.megger.comMegger LimitedArchcliffe Road Dover CT17 9ENUnited Kingdom2. Initial Connection: Set the CP selector on the charge point test adaptor to State A and the PP selector to NC. Connect the charge point test adaptor using the correct connector type.3. PE Pre-Test: Place a bare finger on the adaptor’s PE pre-test button. If the PE pre-test LED lights up, stop testing and investigate the hazardous voltage present on the PE conductor.Part 3 – Tests with the Multifunction Electrical Tester (MFT) 1. Live Circuit Tests: Connect the charge point test adaptor to the MFT. Set the CP to State C or D and the PP to any current.2. Phase Voltage and Polarity: Check with the MFT set to the voltage range. For three-phase chargers, check the phase rotation.3. Earth Loop Impedance: Measure the impedance from phase to neutral and phase to earth. Ensure results are low enough for correct operation of protective devices in case of a fault.4. Voltage Drop: Measure or calculate voltage drop, particularly important as charge points load circuits to their maximum capacity.5. Protective Device Testing: Test RCDs and RDC-DDs using the appropriate MFT settings. Perform tests at different tripping currents and polarities. ■Calibration: Use instruments with up-to-date traceable calibration for certifying new installations. While not essential for routine checking, calibrated instruments ensure result accuracy.Certification and Calibration ■Certification: In some markets, certification may be required to show compliance with relevant standards and regulations. Professional record-keeping and documentation are highly recommended.ConclusionTesting charge points for electric vehicles is a detailed process requiring specific equipment and adherence to safety standards. By following this guide, electricians can ensure EV chargers are installed and functioning correctly, providing safe and reliable charging facilities.For more detailed information and step-by-step guides on using charge point checkers, visit our websiteAn important note about resetting chargersSome of the tests described will make the charger trip out because of simulated fault conditions, while others will necessarily cause protective devices to trip. Before proceeding, check carefully that it will be possible to reset the charger or protective device after tripping. Chargers used in non-domestic applications are frequently networked and supervisor-level access to the network may be needed to reset them. In some cases, however, the charger may offer a maintenance mode to permit local resetting during testing. If this mode is available, it should be used. It is also recommended that in new installations electrical testing should be completed, if possible, before connecting chargers to the network. A further issue relates to protective devices. These are often external to the charger and may even be in another building. It is therefore important to know the location of the devices, and to be sure that access is available to reset them.
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