Regarding the laying of 220VAC power cables, 24VDC power cables, and instrument cables
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The chemical industry standards and automation quality acceptance specifications state that a metal partition should be used when the AC power cables for instruments and the signal cables are laid in the same tray; however, Clause 6.1 of the general standards for building electrical systems and intelligence systems specifies that they must not be laid in the same tray. I’m curious to know what others do in such situations
The common practice is to separate them into different trough boxes; if it is necessary to place them in one trough box for some reason, then metal plates are used to separate them, and this is also what is done in practical engineering applications
"Indeed, the requirements regarding cable installation in the specifications can be confusing. Based on our experience with similar projects, here are a few additional points for reference: In principle, it is best to lay the instrument signal wires and power cables in separate channels; this is especially true in environments with strong interference such as those in the chemical industry. If it is necessary to run them together, the thickness of the metal partitions should be at least 1 mm, and the grounding system must be reliable (our tests have shown that poor grounding reduces the effectiveness of the partitions). We have encountered cases where supervisors required metal partitions to be installed in accordance with GB50217, but the shielding effect was not checked during acceptance. It is advisable to clarify the testing standards in advance