Precautions in the Manufacturing Process of Low-Voltage Distribution Boxes

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# I. Electrical Safety
- **Insulation Treatment**
- The conductive parts inside the box (such as busbars, wiring terminals of electrical components, etc.) must be reliably insulated from the box body. Qualified insulating materials should be used, such as insulating supports, insulating pads, etc. For example, an insulating partition with a sufficient thickness (generally not less than 10mm) should be installed between the busbar and the side plate of the box body to prevent accidental electric shock.
- For parts where creepage phenomena may occur, sufficient electrical clearance and creepage distance should be ensured. In a humid environment, the requirements for creepage distance are higher. For example, the creepage distance between bare conductors of different phases and between bare conductors and grounded metal should be calculated as not less than 1mm per volt of the rated voltage in a general environment; in a humid environment, this value should be appropriately increased.
- **Grounding System**
- The distribution box must have a complete grounding device. A special grounding terminal should be provided on the box body, and its specifications should meet the requirements of the grounding current. The grounding terminal should be reliably connected to the grounding busbar inside the box, and the contact resistance at the connection point should be as small as possible, generally not exceeding 0.1Ω.
- All equipment inside the box that needs to be grounded (such as electrical components with metal casings, the metal shielding layers of cables, etc.) should be connected to the grounding busbar through yellow-green double-color grounding wires. The cross-sectional area of the grounding wire should be determined according to the rated current and short-circuit current of the equipment to ensure that the current can be quickly introduced into the ground in case of a fault.

### II. Component Selection and Installation
- **Component Selection**
- Select appropriate electrical components according to the design purpose and load characteristics of the distribution box. For example, for a distribution box controlling a motor, suitable capacity contactors and thermal relays should be selected. The r