Wiring for Container Houses
Wiring for container houses must adhere to safety standards and professional requirements, with key points including insulation isolation, standardized wiring, lightning protection grounding, and compliant operation. Details are as follows:
Insulation and Isolation Measures
Wires should not be directly tied to the steel components of the container house. Instead, they must be insulated using wire conduits or trough isolation devices. Steel components are highly conductive, and if the wire insulation is damaged, it can easily lead to electric shock accidents. For example, during a rectification campaign in a certain area, it was found that illegally inhabited container houses commonly had issues with unauthorized and haphazard wiring, posing a significant risk of electric shock. Therefore, wires must be wrapped with insulating materials and fixed within dedicated wire troughs to avoid direct contact with metal.
Cable Selection and Wiring Standards
The power supply system should use outdoor-type cross-linked polyethylene insulated flame-retardant cables. These cables must have independent insulation and sheath layers, with a long-term operating temperature of no less than 105°C, and a rated insulation withstand voltage value one level higher than the actual voltage. When wiring, color coding should be used for easy maintenance. For example, in the power distribution system of a container energy storage system, the design of the distribution box should consider the three-phase balance of the electrical load, with air conditioning, lighting, and other equipment having independent circuits to avoid overloading.
Lightning Protection and Grounding System
The roof of the container house must be equipped with a reliable lightning protection system, connected to the grounding bar (no fewer than 2) using grounding flat steel or round steel. All grounding posts must be kept clean, free of paint, rust, or welding slag, ensuring good contact with the grounding cables. The grounding posts inside the container should form an equipotential connection with the metal shell to prevent potential differences during lightning strikes or electrical failures. For example, the lightning protection design of energy storage systems must comply with the "Code for Design of Lightning Protection of Buildings" (GB 50057) to ensure the safety of equipment and personnel.
Compliant Operation and Maintenance
Users must not alter the layout of the container house or dismantle bolt components without authorization to avoid damaging the original electrical safety design. For example, a certain manufacturer explicitly requires that after the installation of the container house is completed, users must not add or remove partitions or modify the wiring without permission. Additionally, regular inspections of the wire insulation status are necessary, with timely replacement of aged cables and avoidance of using high-power unauthorized electrical appliances to prevent line overloading and fire hazards.
