Air switches in a distribution box should be wired with proper phase, neutral, and earth connections, using correctly rated switches for each circuit and organized wiring for safety and efficiency.

Selection of Air Switches

• Main switch: Typically a double-pole 32–63A air switch or isolation switch for the household supply .
• Lighting circuits: Use 10–16A air switches .
• Socket circuits: Use 16–20A air switches; high-power appliances may require 20A .
• Air conditioning circuits: Use 16–25A air switches .
• Three-phase circuits: Ensure the incoming line matches the switch type; connect phase, neutral, and earth appropriately .

Wiring Procedure

1. Preparation: Ensure the distribution box is installed, clean, and ventilated. Prepare wiring conductors, ties, and switches according to design drawings .
2. Guide rail installation: Install guide rails horizontally to align with the cover's operation holes .
3. Switch placement: Arrange switches from left to right, reserving space for main and branch air switches. Typically, the reserved space is on the right side of the box .
4. Phase and neutral wiring:
   • Phase wires (live) connect to the input terminal of each air switch.
   • Neutral wires (blue) connect to the neutral terminal; do not share neutral wires across different phases .
   • Lighting and socket circuits generally use 2.5mm² wires; air conditioning circuits may use 2.5–4.0mm² wires .
5. Earth connection: Connect the protective earth wire to the distribution box or appliance grounding points.
6. Wire routing: Wiring between the main switch and branch switches usually goes on the left; outgoing lines to circuits go on the right. Keep wires straight, free of wrinkles, and tie them with plastic ties at uniform spacing .
7. Circuit labeling: Mark each circuit clearly for identification .
8. Safety check: After wiring, inspect for short circuits, loose connections, or overload risks .

Additional Tips

• Ensure incoming wires are long enough to avoid joints inside the box .
• Maintain consistent wire bending without sharp angles to prevent insulation damage .
• Keep the distribution box at an accessible height (around 1.8 meters) for safe operation . Following these steps ensures that the air switch wiring is safe, organized, and compliant with standard household electrical practices.