Power Supply Standards for Container Houses

The power supply standards for container houses are primarily based on the 'Safety Code for Power Supply and Consumption on Construction Sites' (GB 50194-2014), with core requirements covering safety standards in power distribution system design, equipment installation, grounding and lightning protection, as well as operation and maintenance.

1. Power Distribution System Design Requirements

As temporary structures, container houses must comply with low-voltage power distribution design standards. According to GB 50194-2014, the low-voltage power distribution system on construction sites should preferably adopt TN-S or TT grounding types, clearly distinguishing between the working neutral line (N line) and the protective neutral line (PE line), with no mixing allowed. Power distribution lines should use five-core cables to ensure balanced three-phase loads and prevent fires caused by line overloading. For example, Shandong Guoheng Innovation's container house solutions explicitly mention that their products are equipped with standardized water and electricity interfaces and reserved installation positions for air conditioning and lighting systems, meeting the modular design requirements of the power distribution system.

2. Equipment Installation and Protection Standards

Distribution boxes, switch boxes, and other equipment must be installed in dry and ventilated areas, with a box protection rating of no less than IP44 to prevent rainwater intrusion. The installation height of the equipment should comply with regulations, with the bottom no less than 1.3 meters above the ground for easy operation and maintenance. Zhejiang Hangxing Green Building Materials Technology Co., Ltd.'s container mobile house products have a floor load capacity of ≥2.0kn/㎡, capable of bearing the weight of power distribution equipment, while the wall heat transfer coefficient is ≤0.45w/(㎡·k), reducing energy consumption losses during equipment operation.

3. Grounding and Lightning Protection Measures

Container houses must be equipped with reliable grounding devices, with a grounding resistance value of no more than 10Ω. Exposed conductive parts such as metal boxes and metal pipes should be reliably connected to the PE line to form an equipotential bond. In areas prone to thunderstorms, surge protectors (SPDs) must be installed to prevent damage to equipment from lightning waves. For example, when Sunshine Container Houses use solar power supply systems, the photovoltaic module brackets must be grounded separately to ensure lightning protection effectiveness.

4. Operation, Maintenance, and Safety Management

The power supply system must be regularly inspected, focusing on issues such as line aging, equipment overheating, and loose grounding. Operators must be certified and strictly adhere to power cut-off and restoration operation procedures. Guangdong Tianhui Power Equipment Co., Ltd.'s substation prefabricated cabin products have passed ISO9002 quality system certification, and their production process includes a 72-hour airtightness test to ensure the long-term stable operation of the power supply system.