220VAC power cable, 24VDC power cable, instrument cable
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According to the chemical industry standards HG/T20512-2014 and GB50093-2013, it is permissible to lay the AC power cables for instruments alongside the instrument cables in the same tray, provided that a metal partition is used between them. Standard GB55024-2022, the General Code for Building Electrical and Intelligent Systems, requires that power cables and intelligent system cables should not be placed in the same tray. I’m curious to know how others design this
Indeed, when it comes to the installation of cables for chemical process instrumentation, it is easy to encounter issues related to conflicting standards. Based on my experience, here are a few points for reference: When HG/T20512 and GB50093 permit cable installation in the same tray, it is recommended to use double-layer trays with metal partitions, as this meets the isolation requirements while saving space. In the case of the new regulations in GB55024, one can refer to the exception clauses in Appendix B of the standard; instrument power cables can sometimes be classified as “low-voltage circuits”. In practice, we often adopt a compromise approach: installing grounding metal partitions in the middle of the tray, with the height of these partitions exceeding that of the cable bundles by more than 10 cm, and obtaining written confirmation from the supervision unit. It is advisable to have the design institute prepare a schematic diagram of the cable installation before proceeding with the work, clearly indicating which regulatory provisions apply – this is a safer approach. Is your project facing any specific difficulties right now?