When wiring in non-explosive hazardous areas, the safety spacing between different types of cables varies depending on factors such as the type of cable and the method of installation. Below are some common safety spacing requirements:
1. Parallel Wiring of Power and Low Voltage Cables
According to GB50311-2016 “Comprehensive Cabling System Engineering Design Specifications”, the minimum safety distance for parallel installation of 380V power cables (under 2kV·A) and communication cables is:
130mm if both cables are in non-metallic conduits or cable trays.
70mm if one cable is in a grounded metallic conduit or cable tray.
10mm if both cables are in grounded metallic conduits or cable trays, with a parallel length of no more than 10 meters.
For power cables between 2-5kV·A, the minimum safety distance is:
300mm if cables are installed in parallel.
150mm if one cable is in a grounded metallic conduit or cable tray.
80mm if both cables are in grounded metallic conduits or cable trays.
For cables over 5kV·A, the safety distance increases to:
600mm if cables are installed in parallel.
300mm if one cable is in a grounded metallic conduit or cable tray.
150mm if both cables are in grounded metallic conduits or cable trays.
Additionally, as mentioned in CSDN blogs, the standard for the separation between power and low-voltage cables is at least 300mm, and if space is insufficient, cables should not be installed in the same conduit. A gap of 30mm is considered relatively safe.
2. Crossing of Power and Low Voltage Cables
When power and low voltage cables cross, it is recommended to use a vertical crossing approach. The minimum clearance at the crossing point should be 150mm, and additional insulation measures should be taken at the crossing point, such as using metal partitions or shielding with foil paper.
3. Socket Spacing
GB 50327-2001 “Construction Specifications for Residential Decoration” specifies that the horizontal spacing between power and TV sockets should not be less than 500mm. Additionally, the “Smart Building Low Voltage Engineering Design and Construction Drawings 97X700” suggests that the horizontal distance between information sockets and power sockets in comprehensive cabling should be no less than 200mm.
4. Power Cable Installation in Cable Trays
When installing multiple layers of power cables in cable trays, the minimum spacing between cables should be at least 0.3 meters.
5. Control and Power Cable Spacing
The “Electrical Power Cable Design Standard” (GB 50217-2018) stipulates that when power and control cables are directly buried, the minimum spacing should be 0.5 meters. When placed in conduits, the minimum distance should be 0.25 meters.