The safe distance between gas pipelines and cables is determined based on the pressure level of the gas pipeline and the indoor and outdoor environment. Generally, the horizontal distance between outdoor gas pipelines and cables is 0.5 to 1.5 meters, and indoors it is 5 to 625 centimeters.
"Code for Design of City Gas" GB50028 clearly states:
1. The vertical distance between underground gas pipelines and cables: 0.5m for directly buried cables / 0.15m for cables in conduits;
2. The horizontal distance between underground gas pipelines and directly buried cables: 0.5m for low and medium pressure / 1.0m for sub-high pressure B / 1.5m for sub-high pressure A;
3. The horizontal distance between underground gas pipelines and cables in conduits: 1.0m for low, medium pressure / sub-high pressure B / 1.5m for sub-high pressure A;
4. The net distance between indoor gas pipelines and electrical wires (cables): for exposed insulated wires (cables), parallel 25cm / crossing 10cm; for concealed or in-conduit insulated wires, parallel 5cm / crossing 1cm; for sockets and power switches, parallel 15cm / crossing not allowed;
5. Classification of urban gas pressure levels: low pressure P＜0.01 MPa / medium pressure A 0.2＜P≤0.4 MPa / medium pressure B 0.01≤P≤0.2MPa / sub-high pressure A 0.8＜P≤1.6 MPa / sub-high pressure B 0.4＜P≤0.8 MPa;
6. Indoor horizontal gas mains in civil buildings shall not be concealed in underground soil layers or ground concrete; indoor horizontal mains and risers shall not pass through places such as warehouses of flammable and explosive goods, distribution rooms, cable trenches, flues, and air ducts;
7. Indoor gas risers should be exposed, or may be installed in pipe shafts that are convenient for installation and maintenance. They should be installed in kitchens, corridors, stairwells with good ventilation to the outside, balconies, etc. They shall not be installed in bedrooms, bathrooms, or toilets.
