Temporary electricity use refers to the temporary installation of electrical equipment and power distribution systems for specific locations, often used in construction sites or short-term projects. This system typically starts with a main distribution box (first-level distribution box), which receives three-phase power, along with grounding and neutral lines from the transformer. From there, the power is distributed through secondary and tertiary distribution boxes to different areas or devices.
The first-level distribution box serves as the central point of power supply for construction sites. It is specifically designed to meet the requirements of the construction industry, ensuring safety and compliance with electrical standards. These cabinets are usually installed with a lower exit configuration, featuring a front-opening door, copper busbars for secure connections, and an aesthetically pleasing internal layout. The rainproof top makes it suitable for outdoor use, and it can support a complete three-level protection system—ensuring that each device has its own circuit, switch, and leakage protection.
The second-level distribution box is responsible for distributing power from the first-level box to the actual site where power is needed. It is also built to meet construction standards and includes internal and external doors for added safety. The box is typically mounted 1.5 meters above the ground and is equipped with various switches, such as a 60A–DZ47-63 main switch, a 16A two-phase leakage switch for lighting, a 20A switch for air conditioners, and a 60A two-phase leakage switch for electric water heaters and washing machines. The design ensures that each circuit is protected, with leakage protection set at 15–30mA, which is safe for human exposure.
The third-level distribution box is the final stage, directly controlling individual electrical devices. It acts as the switch box for each piece of equipment, following the principle of “one machine, one switch, one leak, one box.†This setup prevents multiple devices from being controlled by a single switch, reducing the risk of electrical hazards. In larger systems, such as residential buildings, the first-level box distributes power to the entire building, while the second-level box splits the power into separate units. Finally, the third-level box supplies power to individual households, completing the three-tier distribution system.
In modern urban settings, power cables are commonly 4mm² or even 6mm² in size, but for better performance and safety, it’s recommended to use 2.5mm² cables. Proper wiring and protection at each level are essential to ensure reliable and safe power distribution, especially in environments where electrical equipment is frequently moved or changed.
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