Household electricity is divided into strong electricity and weak electricity. “Strong Power†refers to the electric energy source that provides driving and lighting, and the average household in China is generally 220V AC. "Weak power" refers to the transmission of video, audio, and other data through the use of electrical signals. At home, it generally refers to television and telephone signals, computer data transmission, and visual alarm systems.
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Indoor power transmission adopts power lines, and weak power transmission adopts different specifications of signal lines. The wire arrangement complies with the following specifications:
1, the dark line laying must be piped. When the length of the pipeline exceeds 15m or there are two right angle bends, additional cable boxes should be added.
2. The plastic wire protection tube and terminal box must be flame-retardant products, and the appearance should not be damaged or deformed.
3, metal wire protection tube and junction box appearance should not be folded and cracks, the tube should be no burr, the mouth should be smooth.
4. When the power cord is wired, the cross-sectional area of ​​the conductor used should meet the maximum output power of the electrical equipment.
5, the same loop of electrical wires should be threaded into the same tube, but the total number of tubes should not exceed 8, the total cross-sectional area of ​​the wire (including the insulation sheath) should not exceed 40% of the cross-sectional area of ​​the tube.
6. The power line and signal line must not penetrate the same pipe.
7. The horizontal distance between the power cord and socket and the TV line and socket should not be less than 500mm. The intersection of the wires must be at a right angle of 90 degrees to avoid crosstalk.
8. The parallel distance between electric wires and heating, hot water and gas pipes should not be less than 300mm, and the crossing distance should not be less than 100mm.
9. The joints that penetrate the pipe conductors should be located in the junction box. The joints should be firmly connected and the insulation tape should be uniformly wrapped.
10. The resistance between wires and between wires must be greater than 0.5MΩ
11, the same room of power supply, telephone, television and other socket panel should be at the same level elevation, the height difference should be less than 5mm.
12. No exposed conductors are allowed inside the ceiling.
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