Outgoing wires from the on-site distribution box

Outgoing wires from a factory distribution box carry power from the DB to individual circuits, machinery, or equipment, and must be properly sized, color-coded, labeled, and routed for safety and efficiency.

Function of Outgoing Wires

Outgoing wires are the conductors that connect the circuit breakers or protective devices inside the distribution box to the various loads in the factory, such as lighting, machinery, HVAC systems, or socket outlets. Each outgoing wire is protected by its respective breaker to prevent overloads or short circuits, ensuring safe operation of the connected equipment.

Wire Sizing and Specification

The cross-section of outgoing wires should match the load requirements of the connected equipment. For example, lighting and standard socket circuits typically use 2. 5 mm² wires, while high-power machinery or air conditioning circuits may require 4 mm² or larger wires.

Using appropriately rated wires prevents overheating and reduces fire risk.

Color Coding

Proper color coding is essential for safety and maintenance: Phase wires: A-phase (yellow), B-phase (green), C-phase (red)Neutral wire: BlueEarth/ground wire: Green/yellow striped Routing and ConnectionOutgoing wires are generally routed from the right side of the distribution box to the load points, while incoming wires enter from the left. Wires should be neatly bound with plastic ties, maintaining uniform spacing and avoiding kinks or sharp bends. Connections should be secure, with each wire attached to the correct terminal on the breaker or busbar.

Labeling and Safety

Each outgoing wire should be clearly labeled with its circuit designation, voltage, and type of load. This facilitates maintenance, troubleshooting, and ensures compliance with safety standards such as IEC 61439 or NEC Article 408. After installation, a safety inspection should verify that there are no short circuits, overloads, or loose connections.

Industrial Considerations

In a factory environment, outgoing wiring must account for: Environmental factors: humidity, dust, temperature, and chemical exposureLoad balancing: distributing power evenly across phases to prevent overloadingFuture expansion: leaving spare capacity in the DB for additional circuitsCompliance: using high-quality, certified components and following local electrical codes By following these practices, outgoing wires from a factory distribution box can safely and efficiently deliver power to all areas of the facility while minimizing risks and ensuring long-term reliability.