Grounding requirements for electric vehicle chargers in use

The grounding requirements for electric vehicle chargers are very strict, which is to ensure the safety and stability of the charging process. The following is a detailed explanation of the grounding requirements for electric vehicle chargers:

First, the importance of grounding

The main purpose of electric vehicle charger grounding is to prevent the occurrence of leakage and electric shock accidents. During the charging process, if the charger or the electric system of the electric vehicle fails, resulting in current leakage, the ground wire can quickly introduce the leaking current into the ground, thus protecting the safety of personnel and equipment.

Second, grounding requirements

Specifications of ground cable:

The ground wire should be copper wire that meets national standards, and its cross-sectional area should be determined according to the rated current of the charger and the requirements of the ground resistance. In general, the cross-sectional area of the ground cable should not be less than half of the cross-sectional area of the charger power cord.

Requirements for grounding resistance:

Grounding resistance is an important index to measure the effectiveness of grounding system. For electric vehicle chargers, the ground resistance should be less than 4 ohms to ensure that in the event of leakage, the leaking current can be quickly imported into the earth through the ground wire.

Grounding wire connection:

The ground cable should be firmly connected to the ground terminal of the charger, and ensure that the connection is not rusty or loose. At the same time, the other end of the grounding cable should be reliably connected to the grounding body, such as the grounding rod and grounding network.

Installation of ground body:

Install the grounding body in a place with low soil resistivity, and ensure that the depth is sufficient to increase the contact area between the grounding body and the soil and reduce the grounding resistance. For high-rise residential users, if the parking space is located in an underground parking lot, you can use the grounding network or ground point in the parking lot to ground.

Third, grounding check and maintenance

Regular inspection:

The user should regularly check whether the ground cable of the charger is intact, whether the connection is firm, and whether the ground resistance meets the requirements.

Professional maintenance:

If the ground cable is found to be damaged, aging, or the grounding resistance does not meet the requirements, contact a professional electrician for replacement or maintenance in time.

Fourth, precautions

Avoid homemade ground wires:

Users should avoid homemade ground wires, because homemade ground wires may not meet national standards and have security risks.

Use a standard charger:

Users should use chargers that meet national standards and vehicle requirements to charge to ensure the safety and stability of the charging process.

Compliance with operating procedures:

When using electric vehicle chargers, users should follow the operating procedures, ensure that the ground cable is correctly connected, and avoid touching live parts during the charging process.