Methods for manufacturing high and low voltage distribution boxes

The fabrication of high and low voltage distribution boxes typically involves multiple stages, including scheme design, cabinet processing, component installation, circuit assembly, and overall commissioning. The manufacturing process must strictly adhere to electrical design specifications and process standards. First, based on the project's power supply capacity, operating environment, and control requirements, electrical principle and structural designs are completed, determining the models and parameters of circuit breakers, busbars, relay protection devices, instruments, and control components. Next, the cabinet is processed and manufactured, typically using cold-rolled or galvanized steel sheets as the main material, and formed through processes such as laser cutting, CNC punching, bending, and welding. After processing, the cabinet undergoes grinding, rust prevention treatment, and electrostatic spraying to improve corrosion resistance and extend its service life. For high-voltage distribution cabinets, functional areas such as cable compartments, busbar compartments, and circuit breaker compartments must be reserved to ensure a safe and rational internal structure.

 

During the assembly stage, technicians install electrical components such as busbars, circuit breakers, disconnect switches, contactors, relays, and measuring instruments according to the design drawings, and complete the connection between control and power lines. Busbars are typically made of copper or aluminum. To ensure conductivity and operational safety, the connection points require grinding, tinning, or insulation treatment. Simultaneously, the phase-to-phase distance and installation tightening torque must be strictly controlled. After wiring installation, numbering and labeling, as well as wire harness organization, are necessary to ensure convenient future maintenance. After the entire unit is assembled, a comprehensive inspection of the high and low voltage distribution boxes should be conducted, including insulation resistance testing, power frequency withstand voltage testing, grounding continuity testing, mechanical interlocking testing, and power-on operation testing. Only after confirming that all performance meets relevant standards can the unit be shipped. Some intelligent distribution boxes also require debugging of the communication system and remote monitoring functions to ensure the stability and automated control capabilities of the equipment during actual operation.