Flat Roof Prefabricated Circuit Diagram

There is no standard circuit diagram for the prefabricated structure of a flat roof, but a safe and reasonable wiring layout can be designed through the following key principles:

I. Core Method for Wiring Layout in Prefabricated Panels

Due to the hollow structure of prefabricated panels, traditional ceiling grooving and embedding of wire conduits can easily compromise structural stability. The recommended method is 'drilling small holes for wire threading': drill holes with a diameter ≤ 2 cm in the hollow area of the prefabricated panel, thread the wires through these holes into the roof space, and then extend them to the light fixture positions. This method requires advance planning of light fixture locations to ensure that the holes avoid the reinforcing bars in the prefabricated panels and that the spacing between holes does not exceed 1.5 meters, preventing wire exposure or excessive bending.

II. Three Key Principles for Circuit Design

1. Embedding of Light Wires and Circuit Planning

   • The wire conduits and boxes on the roof should be 'minimized to the essentials', with only one main light box retained per room to reduce the risk of structural damage.
   • After extending from the wall to the roof, the light wire conduits should connect the circuits of each room through a distribution box (recommended to be installed in corridors or common areas) to form independent circuits. The distribution box should have a reserved maintenance port for easy future upkeep.
   • Use spring bending tools at conduit bends to avoid wire damage caused by sharp right-angle bends. The bending radius should be ≥ 6 times the diameter of the conduit.

2. Switch Positioning and Conduit Fixing

   • The switch wire conduits should be routed down from the roof to drill holes in the beams or fix bases, 15 cm from the edge of the door frame and 1.3 meters from the floor, ensuring convenient operation and ergonomic compliance.
   • If the door opens inward, the switch should be installed on the opposite wall of the door's opening direction to avoid being blocked by the door.

3. Design of Emergency Lighting Circuits

   • Emergency lighting circuits should be reserved in areas such as staircases and corridors, utilizing dual power supply (main power + backup battery) to ensure automatic switching during power outages.
   • The wire conduits for emergency lights should be routed up and down from the roof and connected to the fire control box or an independent distribution box, with the outer wall of the conduits marked with 'emergency circuit' labels.

III. Material and Construction Considerations

• Conduit Selection: PVC conduits are preferred (corrosion-resistant and easy to bend), avoiding iron conduits (prone to rust and difficult to install).
• Box Specifications: For smart devices (such as smart bulbs and sensors), use reinforced 86-type boxes. Ordinary boxes may not provide sufficient space due to complex wiring.
• Safety Regulations: Before construction, verify the house's structural diagram to avoid the reinforcing bars in the prefabricated panels. Wires must be protected by conduits and not exposed. Each circuit must be equipped with a leakage protector with a rated operating current ≤ 30mA.

Before actual construction, it is advisable to contact a professional electrician to draw a detailed circuit diagram based on the house's structure, clarifying hole locations, conduit routes, and circuit partitions to ensure compliance with the 'Residential Decoration and Renovation Engineering Construction Specifications' (GB 50327-2001).