Container House Grounding

Container houses must be grounded to ensure lightning protection and electrical safety. Specific measures are as follows:

Lightning Protection Grounding

If a container house is not grounded, its metal body, being highly conductive, may attract lightning during thunderstorms, increasing the risk of lightning strikes. After proper grounding, the metal body can form a Faraday cage effect, directing lightning current into the ground and reducing the risk of lightning strikes to people and items inside. The grounding resistance should be no more than 4Ω to ensure effective dissipation of lightning energy.

Electrical Safety Grounding

If electrical equipment is installed inside a container house, grounding is necessary to prevent electric shock accidents. When the outer shell of electrical equipment is grounded, in case of insulation damage, the current will flow into the ground through the grounding wire first, rather than through the human body, thereby protecting personnel safety. The grounding system must comply with the requirements of GB 50065—2011 'Code for Design of Grounding of AC Electrical Installations'.

Key Points for Grounding Implementation

• Selection of Grounding Electrodes: Galvanized steel pipes or galvanized angle steels can be used, with a length of no less than 2.5 meters. One end of the grounding electrode should be processed into a pointed shape for easy driving into the ground.
• Installation Requirements: Excavate a foundation pit with a depth of 0.8 meters to 1 meter, and vertically drive the grounding electrode into the soil. Stop when the top end is about 600mm from the ground surface. The grounding electrodes should be connected by welding with galvanized flat iron, and the welding length should comply with the specifications (e.g., the welding length between steel bars and flat iron should be no less than twice the width of the flat iron).
• Equipotential Bonding: A grounding grid should be laid inside the container, and the grounding terminals of electrical equipment, cable shielding layers, etc., should be connected to the equipotential grounding grid through dedicated copper bars, and finally led out to the grounding point outside the container body. Electrical equipment should be grounded separately and series connection is strictly prohibited to avoid the risk of potential difference introduction.

Special Scenario Handling

• Energy Storage Containers: Anti-static floors should be laid, with a system resistance value of 1×10⁶1×10⁹Ω and a surface resistance value of 2.5×10⁴1.0×10⁹Ω to dissipate static charges.
• Modular Containers: A disconnectable grounding bar structure can be adopted for easy maintenance and inspection while ensuring grounding continuity.