Title www.megger.com8CAR CHARGERS FOR ELECTRIC VEHICLES:A STEP-BY-STEP GUIDE TO AUTOMATED TESTINGCertificationIn some markets, certification may be required or even mandatory to verify that car chargers have been tested and shown to comply with relevant standards and regulations. Even when this is not the case, professional record keeping and documentation are highly desirable. Megger makes this easy with its CertSuite Installation software, which automatically captures test results from the MFT-X1 and produces professional quality reports and certificates at the touch of a button. CertSuite Installation is compatible with portable devices using the iOS and Android operating systems, and it is also available in a version that will run on all popular web browsers.CalibrationInstruments with up-to-date traceable calibration should be used for the certification of new installations. While calibrated instruments are not essential for routine checking of car chargers, they are highly recommended as otherwise it is impossible to be confident about the accuracy of the results obtained. Recommended calibration intervals vary, but the instrument manufacturer will be able to provide dependable advice.Resetting protective devices during testingTesting the RCD or RDC in a car charger will necessarily trip the protective devices protecting the charger and the user. Protective devices may also be tripped accidentally if an incompatible loop impedance test is selected. Before testing the charger, ensure that access to the protective devices is possible so that they can be reset once they have tripped. These devices may be found in the charger itself, such as the RDC, or on the circuit supplying the charger, in the distribution board or in a locked control room.Domestic chargers should not present any issues but public access, commercial and company installations may be connected to a back-office network or linked to an app on a mobile device. In these cases, it may be necessary to discuss the need for access with the network owners before work commences, as the charger, once tripped, may not reconnect for some minutes or even hours.If a charger does not reset during an RCD or RDC tripping sequence, it is rarely (if ever) the fault of the instrument. It is almost certainly the charger or back-office system that is preventing it from resetting. Chargers and installations vary considerably in this respect, but if all other methods fail, it may be possible to force the charger to reset by turning off the power to it, waiting a short time, and turning it on again. This should, however, always be a last resort. Contact the car charger manufacturer for additional advice.www.megger.comMegger LimitedArchcliffe Road Dover CT17 9ENUnited Kingdom
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