Industry News | 2025.06.20

What size cable is needed for a 7kW AC 2/3 wheel electric vehicle charging station?

What size cable is needed for a 7kW AC 2/3 wheel electric vehicle charging station?

Charging stations are a very common energy supply device nowadays, but there are still many people who do not know how many square meters of wires are needed to install charging stations. After all, the wire harness thickness of the charging post cannot be unified. It is mainly determined by the power storage capacity of the charging post and the voltage borne by the wire harness when the power is circulated. What size cable is needed for a 7kw charging station? What is the actual power?

2/3 wheel electric vehicle charging station

Charging stations can be divided into single-phase and three-phase, but whether it is single-phase or two-phase, the first step is to calculate the AC incoming line current.
For single-phase charging stations (AC charging stations), l=P/U
For three-phase charging stations (DC charging stations), l=P/(U * 1.732)

After calculating the current according to this algorithm, select the cable based on the magnitude of the current.

Manual/regulations related to charging station cables:
A single-phase charging station is generally 7KW (AC station) with l=P/U=7000/220=32A, and a copper core cable of 4 square millimeters should be used.
Three phase charging station (DC station)
15KW current 23A cable, 4 square millimeters
30KW current 46A cable, 10 square millimeters
60KW current 92A cable 25 square millimeters
90KW current, 120A cable, 35 square millimeters
Charging stations should have neutral and ground wires; So single-phase cables require three core cables, while three-phase cables require five core cables.

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