What are the specific requirements for electrical grounding of solar street lights to ensure safe use?

The electrical grounding requirements of solar street lights ensure the safety of use, specifically including the following points:

Protective grounding: all conductive parts, such as light poles and luminaire housings, need to be connected to the grounding system through wires to prevent electrocution caused by leakage. Grounding resistance should meet the requirements of the leakage protector, usually less than 4Ω, to ensure that the power supply can be quickly cut off in case of leakage.

Work grounding: In the low-voltage grid, the neutral point is directly grounded to ensure stable operation of the system, and the grounding resistance is less than 10Ω, which is applicable to the low-voltage power supply system of solar street lights.

Lightning protection and grounding: In lightning-prone areas, install lightning rods or lightning strips and ensure that they are effectively grounded, and the grounding resistance should likewise be less than 10Ω to protect the equipment from damage caused by lightning strikes.

Zeroing and equipotential connection: Ensure that metal parts are connected to the neutral or ground wire to reduce potential difference, avoid electrical interference and improve safety. In specific cases, connect all metal parts to the same grounding system through equipotential connection to ensure consistent potential.

Conductor selection and connection: The grounding wire should be insulated and the entire wire should be free of joints to ensure that the current is smoothly conducted into the earth. Lightning arrester grounding wire should choose the shortest path to the grounding network. Conductor cross-sectional area should be selected according to the requirements of the equipment and the size of the current to ensure sufficient current-carrying capacity.

Grounding system design: Consider the soil resistivity, geological conditions, choose suitable grounding materials (such as copper rods or galvanized steel pipe), and ensure the burial depth, generally more than 1.5 meters, to improve the grounding effect.

System consistency: The grounding system of the whole solar street light system, including panels, batteries, controllers and lamps, should be consistent to avoid problems caused by potential difference.

Regular Inspection and Maintenance: The effectiveness of the grounding system needs to be checked regularly to ensure that the connections are firm, corrosion-free, and that the grounding resistance meets standards to maintain long-term safety.

Following these electrical grounding requirements can effectively prevent electrical accidents and protect the solar street light system and users.