Secondary distribution boxes, also known as sub-distribution boxes, generally serve specific power supply areas. These boxes have inner and outer doors, powder-coated exteriors, and are designed for safety and aesthetic appeal, with rainproof tops for outdoor work. It ensures stable operation for machines, lines, and equipment. Electrical switchgear and control equipmentIt is installed and protected inside distribution box., SHENG SHING, and YURA CORPORATION VINA COMPANY LTD. accounting for 65% of Vietnam's total Distribution Box. Primary distribution systems consist of feeders that deliver power from distribution substations to distribution transformers.