Depending on the installation, the tests performed during routine testing of an EVSE should, as a minimum, include those listed below. This is not an exhaustive list; additional tests may be required in some circumstances.
Visual inspection. Particular attention should be given to the condition of connectors and connecting cables.
Protective earth test. This checks for open circuit ground connection or voltage present on the ground connection.
Protective conductor resistance measurement. This confirms that any metalwork on a Class I EVSE (an EVSE that doesn’t use double-insulated construction) is connected to the EVSE ground.
Touch voltage measurement. This checks to ensure that the earth voltage of the charger will not rise to a dangerous level in fault conditions.
Earth fault tripping time test. This checks that, in fault conditions, the protection device(s) – RCD/GFCI and/or RDC-DD – operate quickly enough to protect the user.
All of the preceding tests are safety tests. If the EVSE fails any of these tests, testing must be stopped, and the EVSE must be taken out of service until the reason for the failure has been located and remedied.