【Y2025】How to ensure that instrument cable trays pass through buildings, structures, or equipment in a compliant manner
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The attachment shows how instrument cable trays can be installed in compliance with regulations when passing through buildings, structures, or equipment.
For reference: Grounding of cable trays: The grounding of cable trays shall comply with the relevant provisions of the \"Specifications for Grounding Design of Instrumentation Systems\" HG/T 20513.
For reference: Fire protection for cable trays – It is required that fire-resistant sections be established in the cable trays by using fire-resistant or flame-retardant boards or mesh materials to create sealed or semi-enclosed structures. Additionally, fire-resistant coatings that comply with the \"Technical Specifications for the Application of Fire-Resistant Coatings on Steel Structures\" CECS24 (standard issued by the China Engineering Construction Standardization Association) should be applied to the surface of the cable trays. The overall fire resistance of these cable trays must also meet the requirements of relevant specifications or standards; fire-resistant and flame-retardant cable tray products can be used for this purpose.
For reference: Selection of anti-corrosion treatment methods: In principle, the appropriate anti-corrosion treatment method should be chosen based on factors such as the engineering environment conditions, the importance of the structure, the requirements regarding the durability of one-time anti-corrosion treatments, as well as the durability and cost-effectiveness that can be scientifically assessed for the cable tray products in that environment. In cases of mild corrosion, tray systems made of plastic coating, electro-galvanizing, or hot-dip galvanizing can be used. In applications with high corrosion resistance requirements, aluminum-magnesium alloys, nickel-phosphorus alloys, zinc-nickel alloy-coated steel cable trays, or fiberglass (especially composite fiberglass) cable trays can be used.
For reference: The overall requirement is that everything should be aligned neatly in a straight line, with sufficient space between it and the buildings. When the cable tray and brackets are connected by welding, it is necessary to ensure a secure weld; at the same time, the cable tray must not deform. When the cable tray is connected and fixed using screws, hexagonal bolts should be used with nuts on the outside, so as to prevent the cables from being scratched or caught inside the tray.
For reference: When used in conjunction with power cable trays, power cables and low-voltage cables should be placed on separate sides, with a partition used to separate them.
For reference: When low-voltage cables are used together with other low-voltage cables in the same tray, it is essential to choose low-voltage cables for low-voltage systems that have an external shielding layer, in order to avoid interference between them.
For reference: The spacing between instrument cable trays and the like should comply with the provisions of the \"Design Specifications for Instrument Piping and Wiring\" HG/T 20512.
For reference: Trunking cable tray: A trunking cable tray is a fully enclosed type of cable tray. It is most suitable for planning computer cables, communication cables, thermocouple cables, and control cables for other highly sensitive systems. It provides good protection against shielding interference in control cables as well as against harsh environmental conditions affecting cables.
For reference: Hot-dip galvanized cable trays: Steel components are immersed in molten zinc at a temperature of around 600°C, resulting in a thick layer of zinc adhering to the surface of the tray. Suitable for severe outdoor corrosion environments; high cost