Plugs, socket-outlets, vehicle connectors and vehicle inlets — Conductive charging of electric vehicles - General requirements
1Key Takeaways
1 Scope This part of IEC 62196 is applicable to EV plugs, EV socket-outlets, vehicle connectors, vehicle inlets, herein referred to as "accessories", and to cable assemblies for electric vehicles (EV) intended for use in conductive charging systems which incorporate control means, with a rated operat…
2Expert Interpretation
This article interprets the BS EN IEC 62196-1:2026 standard, which covers the general requirements, test methods, and major technical updates of the fifth edition for plugs, sockets, vehicle connectors, and vehicle sockets of electric vehicle conductive charging systems, including locking devices and humidity exposure testing.
Background and Technological Evolution of Standard Development
BS EN IEC 62196-1:2026 is a general requirements standard for accessories of electric vehicle conductive charging systems (including EV plugs, EV socket-outlets, vehicle connectors, and vehicle inlets). Developed by IEC SC 23H, this fifth edition replaces the fourth edition (2022). Key technical changes include: new testing requirements for locking and retaining devices, the introduction of Type 4 accessories, and the expansion of humidity exposure testing to verify the contact stability of silver-plated alternatives.
With the increasing charging power of electric vehicles and the diversification of charging interfaces (AC, DC, combined interfaces), the standard continues to evolve.
The IEC 62196 series covers AC (Part 2), DC (Part 3), etc., and this part serves as a fundamental safety and performance guideline.
Comparison of Major Technical Changes
| Aspects | Fourth Edition (2022) | Fifth Edition (2026) | Impact |
|---|---|---|---|
| Latching Device | Basic Mechanical Testing Only | Added 14.1.10 External Force Test for Locking Device (500 N) | Improved Connection Reliability, Preventing Accidental Disconnection |
| Humidity Exposure Test | Insulation Test After Humidity Cycling Only | Added Clause 35 Full Humidity Exposure (95% RH, 85°C) | Verified Long-Term Stability of Non-Silver Plated Contacts |
| Type 4 Accessories | Not Covered | Included in Type 4 (Vehicle Connectors/Sockets for DC Charging) | Expanding Standard Scope to More Charging Scenarios |
Key Requirements Analysis
Ratings and Classifications
The standard specifies rated voltage: AC ≤690 V, DC ≤1500 V; rated current: AC ≤250 A, DC ≤800 A. Accessories are classified according to their purpose, connection method, electrical operation, etc. Accessories that are "not suitable for load switching" must be equipped with interlocking devices.
Size and Compatibility
Accessories must conform to standard size drawings (see IEC 62196-2/3) to prevent mis-insertion between different ratings or pole numbers.
Tests show that when inserted with a force of 150 N (≤16 A) or 250 N (>16 A) for 1 minute, there should be no misinsertion.Protective Grounding and Contact Sequence
When inserting, PE contacts should be made before phase and neutral lines, and CP contacts should be made last; the extraction sequence is the reverse. The grounding loop resistance should be ≤0.05Ω and must pass a short-time current test (see Table 4).
Test Method Overview
The standard includes a wide range of tests: temperature rise test (Clause 24), normal operation (23), breaking capacity (22), short-circuit withstand (31), mechanical strength (26), etc. The test sequence is divided into a main sequence (Table 1) and parallel tests (Table 2), and new temperature cycling (34), humidity exposure (35), and contact durability (37) tests are introduced.
Implementation Recommendations
Manufacturers should focus on the following key points:
- The locking device design must pass a 500 N external force test (14.1.10);
- Non-silver plated contacts must pass Clause 35 humidity exposure + Clause 37 contact durability verification;
- Type 4 accessories must conform to the newly added standard drawings;
- Pay attention to specific requirements of different countries (e.g., France requires IPXXD protection against misinsertion).
It is recommended that companies update their product design and testing procedures according to the fifth edition as soon as possible to ensure compliance before the mandatory transition on January 31, 2029.