An Introduction to Charging Cable Specifications for Home Electric Vehicles

China [CN]

Charging cables, as the current carrier connecting electric vehicles to charging stations, have always been a concern for public safety. They must transmit information between the two and control charging. They must also maintain excellent insulation properties and possess high resistance to aging, heat, oil, and weathering. Because they are frequently bent and stretched during use, the cables must also possess excellent flexibility and mechanical properties.

Generally, charging stations are categorized by rated power: 3.5 kW and 7 kW. The 3.5 kW charging station has a rated current of 16A, while the 7 kW charging station has a rated current of 32A. Both types of charging stations are connected to 220V single-phase household electricity.

Home charging stations typically connect to 220V single-phase electricity, but the power and current requirements vary, requiring different cables and circuit breakers. A 3.5kW charger or charging station requires a 4-square-meter cable. Normally, the cable used to connect a home air conditioner is 4-square-meter. A portable, ground-free 3.5kW charger can be plugged directly into the air conditioner outlet. A charging station requires a 4-square-meter cable (if the meter is too far from the parking space, a 6-square-meter cable is recommended). A 7kW charging station or charger using a separate cable requires at least 6-square-meter cable or larger. A ground wire is essential. If the connection distance is long, a 10-square-meter cable is recommended. For safety reasons, the cost difference between 10-square-meter and 6-square-meter cables is not much.

A 7kW home charging station has a rated current of 32A, so the circuit breaker connected to the line requires a 40A or 60A rating. The circuit breaker provides immediate protection in the event of overcurrent or overvoltage.

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