Electrical Cabinet Secondary Wiring Process Requirements

Secondary wiring in electrical cabinets must follow strict standards for layout, material selection, insulation, grounding, and anti-misoperation measures to ensure safety, reliability, and maintainability.

Wiring Layout and Arrangement

Secondary wiring should follow the principle of horizontal and vertical alignment with clear layering to maintain order and accessibility. Wires should be grouped by function or routing into wire harnesses, secured with nylon cable ties or binding wires, and the spacing of bundles should be consistent to prevent sagging or interference . Avoid joints in the middle of wires; connectors should be located at device terminals or terminal blocks to prevent loose connections . Wires must be routed away from arcing components such as circuit breakers or contactors to prevent insulation damage .

Material Selection

Select wires according to their function and current-carrying requirements. High-current circuits require larger cross-sectional area wires to reduce resistance, while low-voltage signal circuits use smaller wires to minimize interference. Protective grounding wires must meet thermal stability requirements for short-circuit conditions . Use wires with proper insulation, cold-pressed terminals, wire number tubes, and insulating tapes as specified in the design . Color coding should follow relevant standards (e.g., DIN 46228, H05V-K, H07V-K) for clarity and compliance .

Wire Stripping and Crimping

Strip wires to the appropriate length (typically 6–10 mm) without damaging the copper core. For multi-strand flexible wires, twist the strands, attach the correct cold-pressed terminal, and crimp firmly to ensure reliable contact and prevent overheating or arcing . Ensure that no copper is exposed outside the terminal.

Component Inspection and Connection

Before wiring, inspect all components for damage, loose terminals, or functional issues . Connections such as ammeter-shunt loops should be direct to minimize contact resistance, and test terminals can be used for easy measurement without disconnection . Ensure all connections are mechanically secure and electrically reliable.

Safety and Anti-Misoperation Measures

• Maintain proper insulation and separation between conductors and live components .
• Ensure grounding is continuous and meets thermal and electrical requirements .
• Use clear labeling and wire numbering to prevent misoperation .
• Keep wire lengths sufficient for maintenance but avoid excessive slack that can cause clutter .

Production and Assembly Considerations

In manufacturing or assembly lines, secondary wiring should be centralized in dedicated workstations to improve safety, repeatability, and efficiency. Assisted lifting and organized material flow reduce operator fatigue and risk during heavy component handling . Proper workstation layout ensures consistent wiring quality and facilitates inspection and maintenance.

Summary

Following these requirements ensures that secondary wiring in electrical cabinets is safe, reliable, and maintainable, with clear organization, proper material selection, secure connections, and effective anti-misoperation measures. Adhering to these standards also supports compliance with international wiring codes and improves operational stability of the electrical system .