Electrical Installation for Electric Vehicle Charging Stations

IEC 60364-7-722 Standard Technical Guidance

Electric vehicle (EV) charging stations pose specific risks due to their high current capacities and user interaction. What are the DC leakage current protection and grounding requirements for vehicle charging installations?

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Safety in Electric Vehicle Charging (EVSE) Facilities

The IEC 60364-7-722 standard defines specific electrical installation rules for the power supply circuits of electric vehicle charging stations (EVSEs). With the increasing prevalence of next-generation electric vehicles, it is essential that charging infrastructure is constructed in accordance with safety standards. At AES Innovation, we audit the compliance of charging station installations and operations with IEC 60364-7-722 and related standards.

The biggest threat in EV charging is that leakage currents with a direct current (DC) component exceeding 6mA can 'blind' standard type RCD protections. The standard mandates the use of independent overcurrent and Type B RCD or equivalent protection devices for each EV charging port, as well as compliance with IT and PEN system restrictions.

Critical Protection Measures in Vehicle Chargers

What does charging station electrical inspection include?

  • Overcurrent and Diversity Control:
    Each charging point is equipped with dedicated circuitry and protection equipment. For multiple home installations, power load balancing is checked.
  • DC Leakage Current Protection Function Test:
    According to IEC 60364-7-722, testing and verification of the use of at least a Type A RCD with a 6 mA DC detection device or a direct Type B RCD is carried out using specialized simulators.
  • Grounding and Equipotential Connection Test:
    The inspection includes checking areas where the use of PEN conductors is prohibited, measuring grounding resistance (TN/TT), and assessing the equipotential bonding structure with external mechanical barriers.
  • Type, Mode, and Cable-Connector Inspection:
    The compliance of Modes 1, 2, 3, and 4 charging mechanisms with IEC 61851, cabling capacity, and the IP and IK resistance of the station housing are visually inspected.
WHY AES INNOVATION?

Secure Charging Infrastructure for the Energy of the Future

An electrical malfunction at a charging station risks damaging million-dollar vehicles and, because it's in a public place, endangers human lives. With our TÜRKAK accredited services With our engineering expertise and a dedicated EVSE test simulator, we ensure that the stations fully meet the IEC 60364-7-722 requirements.

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International Standards and Related Legislation

The IEC 60364-7-722 is the basic electrical installation code for EV charging infrastructure. Product standards for electric vehicle chargers (EVSE) are IEC 61851-1 and IEC 61851-22 for AC stations and IEC 61851-23 for DC charging stations. Additionally, the IEC 62196 series standards should be considered for connector systems.

Frequently Asked Questions

Frequently asked questions about electric vehicle charging station installation and periodic inspection requirements.

Comprehensive measurements should only be performed by certified electrical engineers (SMM) who have received relevant training and are equipped with IEC 61851 compliant EVSE test simulators, and using accredited procedures.

During electric vehicle charging, a leakage DC current exceeding 6mA can occur from the battery. This DC current can saturate and lock standard Type AC or Type A residual current devices used in homes. According to IEC 60364-7-722, a Type B or Type A+ 6mA DC detector is required.

No. According to the IEC 60364-7-722 standard, each electric vehicle connection point must be powered by its own independent and dedicated terminal block circuit drawn from the electrical panel.

Outdoor charging stations should have an IP44 rating (preferably IP54 or higher) and a mechanical impact protection class of at least IK08.

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