Charging pile construction, how to choose cables? Here comes the hardcore answer

March 19, 2024

Charging pile is now a very common energy supply equipment, but there are still very many people do not know how many square wires are needed to install charging pile. Charging pile harness thickness can not be unified, mainly by the charging pile of the power storage capacity and harness in the circulation of electricity when the voltage to be determined, in general the charging pile wire compared to other wires to be a lot thicker, today we come together to learn how to install the charging pile how to choose the right cable line.

Cable selection 

A. Charging pile has a single-phase and three-phase points, regardless of two-phase or single-phase, first of all to be converted to the AC inlet current is how big.

① For single-phase charging pile (AC charging pile) I = P / U

② For three-phase charging pile (DC charging pile) I = P / (U * 1.732) so that after calculating the current, according to the size of the current selection cable.

B. Cable selection can refer to relevant manuals or regulations such as:

① single-phase charging pile is generally 7KW (AC charging pile)

According to I=P/U=7000/220=32A, 4mm2 copper core cable should be used.

Three-phase charging pile (DC pile)

15KW current 23A cable 4 mm2

30KW Current 46A Cable 10mm2

60KW 92A 25mm2 cable

90KW 120A cable 35mm2 In addition, all charging piles should have zero and earth wires.

So single-phase should be three-core cable, three-phase should use five-core cable.

Construction requirements 

As an electric vehicle charging pile (peg) on the power distribution side of the grid, the specificity of its structure determines that the automated communication system is characterised by many and scattered measured points, wide coverage and short communication distance. And with the development of the city, the network topology requires a flexible and scalable structure, therefore, the selection of the electric vehicle charging pile (peg) communication method should consider the following issues:

① Reliability of communication - the communication system should withstand the test of harsh environment and strong electromagnetic interference or noise interference for a long time, and keep the communication smooth.

② construction costs - in order to meet the premise of reliability, comprehensive consideration of construction costs and long-term use and maintenance costs.

③ Bi-directional communication - not only the uploading of information volume can be realised, but also the downloading of control volume can be realised. 

④ Data transmission rate for multi-service - With the continuous growth of terminal service volume in the future, the communication between master station to sub-station and sub-station to terminal requires more and more data transmission rate for realising multi-service.

⑤ Communication flexibility and scalability - As charging piles (bolts) have the characteristics of many control points, wide surface and dispersion, it is required to adopt standard communication protocols, and with the development of the trend of "ALL IP" network technology and the continuous growth of electric power operation services, it is necessary to consider IP-based service bearer. With the development of "ALL IP" network technology trend and the continuous growth of power operation business, it is necessary to consider the IP-based business bearing, and at the same time, it is required to facilitate the installation, construction, commissioning, operation and maintenance.

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