There are four conductive EV charging modes: Mode 1, Mode 2, Mode 3 and Mode 4. The IEC 61851 classification describes how the electric vehicle connects to the electrical supply and where charging control and protection functions are provided. Modes 1, 2 and 3 are AC charging arrangements, while Mode 4 supplies DC to the vehicle from off-board charging equipment.
Which charging mode matters most for a UK home charger?
For a dedicated domestic charge point, Mode 3 is the main arrangement to understand. Mode 2 is associated with socket-based charging equipment that includes in-cable control and protection, while Mode 4 is principally a DC charging arrangement used for higher-power charging infrastructure. The mode number itself does not tell you the charging speed, connector type or whether the charger has smart functions.
What are the four EV charging modes?
The charging-mode classification comes from the IEC 61851 series for conductive electric vehicle charging systems. It describes the electrical relationship between the vehicle, the charging equipment and the supply rather than creating four simple levels of charging performance.
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How does each EV charging mode work?
Mode 1 charging
Mode 1 connects the EV to an AC supply through a standardised socket-outlet using the power conductors and protective earth, without the in-cable control arrangement that distinguishes Mode 2.
It remains part of the IEC charging-mode classification, but it should not be confused with a modern dedicated domestic EV charge point. Current IET technical material discusses Mode 1 and Mode 2 in the context of socket-outlet charging, while dedicated domestic EVSE is normally Mode 3.
Mode 2 charging
Mode 2 also uses an AC socket-outlet, but adds a control pilot function and personnel-protection arrangement between the EV and the plug, typically through the charging cable's in-cable control and protection equipment.
Mode 2 therefore should not be described simply as “charging from any ordinary socket”. The suitability of the socket, circuit and charging equipment still matters.
Mode 3 charging
Mode 3 uses dedicated EV supply equipment connected to the AC electrical installation. Its control pilot function extends to the charging equipment, allowing the EVSE and vehicle to coordinate the charging connection.
This is the common arrangement for a permanently installed AC charge point at a house, workplace or destination. Different Mode 3 chargers can operate at different power levels, so “Mode 3” is not a charging-speed rating.
Mode 4 charging
Mode 4 uses an off-board charger and supplies DC to the vehicle. The conversion required for charging takes place in the charging equipment rather than relying on the vehicle's on-board AC charger.
Mode 4 is therefore associated with DC charging equipment and is commonly used where substantially higher charging power is required, including public rapid-charging infrastructure.
Does a higher EV charging mode mean faster charging?
No. The mode number does not operate as a simple speed scale.
Charging mode describes the connection and charging arrangement. Actual charging power depends on the EVSE, the electrical supply, the vehicle's charging capability and the particular AC or DC system being used.
Mode 3, for example, covers dedicated AC EVSE at different ratings. Two chargers can therefore both be Mode 3 while offering different charging power.
What is the difference between Mode 3 and Mode 4?
The clearest distinction is the type of power delivered to the vehicle. Mode 3 EVSE supplies AC to the vehicle, so the vehicle's on-board charger performs the AC-to-DC conversion needed by the battery. Mode 4 uses off-board charging equipment and supplies DC to the vehicle.
This is why Mode 3 is closely associated with dedicated AC charging at homes and workplaces, while Mode 4 is commonly associated with rapid public charging.
Which EV charging mode is normally used at home?
A dedicated permanently installed home charge point is normally a Mode 3 arrangement. The EVSE is connected to the fixed electrical installation and provides the control functions needed for dedicated AC vehicle charging.
Mode 2 can still be relevant where compatible portable charging equipment is connected through a suitable socket-outlet. That is a different arrangement from installing a dedicated wall-mounted EV charge point.
Is a smart EV charger another charging mode?
No. Smart charging and Mode 1–4 describe different things.
A charging mode describes the electrical charging arrangement. Smart functionality concerns features such as scheduling, communications and the charger's ability to respond to external control signals.
The Electric Vehicles (Smart Charge Points) Regulations 2021 apply to relevant private domestic and workplace charge points sold in Great Britain. Those product requirements do not create a fifth EV charging mode.
Does knowing the charging mode tell you how to install the charger?
No.
Charging mode is only one part of the technical picture. It does not by itself determine the required circuit design, protective devices, earthing arrangement, cable route, supply capacity or suitability of the existing consumer unit.
For a planned
EV charger installation assessment
,
the electrical supply and proposed EVSE need to be considered together before the final installation arrangement is selected.
- the EVSE type and proposed charging power;
- available electrical supply capacity;
- the proposed charging position and parking arrangement;
- the cable route;
- the dedicated charging circuit;
- protective and earthing arrangements;
- the existing distribution equipment;
- whether load management is required.
Technical References
The charging-mode descriptions and UK installation context in this guide are based on current IEC, IET and government information available in August 2026.
Planning a dedicated home EV charge point?
The charging mode is only one part of the design. The electrical supply, charger, circuit, cable route and available capacity should be reviewed before installation.
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