The issue of arranging flammable liquids and cables together in the same cable tray

\"Code for Design of Electrical Installations in Explosive and Flammable Environments\" (GB50058-92): Article 2.5.8……… III. When electrical circuits are laid along pipelines or trestles that carry flammable gases or liquids, the following requirements shall be met: 1. Along the side of the pipeline with a lower degree of hazard； 2. When flammable materials are heavier than air, above the pipeline ； When lighter than air, it is below the pipeline.

Table 5.2.3 Minimum clear distances (m) between cables, as well as between cables and pipes, roads, and buildings – parallel and intersecting arrangements Item Minimum clear distance (m) Between power cables and between power cables and control cables 10 kV and below Parallel Intersecting Over 10 kV 0.10 0.50 Between control cables 0.25 0.50 Between cables from different departments – 0.50 Hot pipes (trenches) and thermal equipment 0.50 0.50 Oil pipes (trenches) 2.00 0.50 Pipes for flammable gases and liquids (trenches) 1.00 0.50 Other pipes (trenches) 1.00 0.50 Railway tracks 0.50 1.00 Electrified railway tracks AC 3.00 1.00 DC 3.00 1.00 Roads 1.50 1.00 Urban road surfaces 1.00 0.70 Pile foundations (along the edge) 1.00 – Building foundations (along the line) 0.60 – Drainage ditches 1.00 0.50

1. First, the cable should be laid above the pipes carrying flammable liquids with a lower level of hazard (liquids at room temperature whose vapors are heavier than air)； 2. When cables are laid parallel to flammable liquid pipelines, the minimum clear distance is 1 meter; when they are laid intersecting, the minimum clear distance is 0.5 meter ； 3. When other pipes are equipped with insulation or other protective measures, the clear distance should be measured from the pipe wall or the outer surface of such protective measures ； When the cross-clearance cannot meet the requirements, the cable should be placed in a tube, allowing the clearance to be reduced to 0.25 m. 4. Even if the clear distance between the cable and the pipes carrying flammable liquids meets the requirements, protective measures should still be taken within 1 meter around the intersection points, in case maintenance work on the pipes may damage the cable ； 5. Cables of higher voltage levels should be laid below cables of lower voltage levels. The above content is summarized in accordance with the relevant provisions of GB50058-92 \"Code for Design of Electrical Installations in Explosive and Flammable Environments\" and GB 50168-2006 \"Code for Construction and Acceptance of Cable Lines in Electrical Installation Projects\".

Refer to the \"GB 50217-2007 Code for Design of Cables in Electrical Engineering\", the \"GB50168-2006 Code for Construction and Inspection of Cable Lines in Electrical Installation Works\", and the Code for Design of Electrical Installations in Explosive and Fire-Hazardous Environments

Issue of arranging flammable liquids and cables together in the same tray: For overhead open ducts, the installation of power cables shall be carried out in accordance with the provisions of relevant professional standards. They can generally be arranged in the same pipe rack, but depending on the properties of Class A, B, and C liquids or flammable gases, they should be placed separately on either side of the pipe rack or in different floors, away from their delivery pipelines.