Problems with the laying of communication cables and SIS cables
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Code for Design of Instrumentation, Piping and Lines in Petrochemical Industries SH/T 3019-2016 7.1.9 Field buses and communication cables should be laid separately； When it cannot be laid separately, a partition should be used for separation. I would like to ask: what does this mean? Does the MODBUS communication cable need to be laid in a separate tray or with a partition from 4–20mA non-intrinsic safety signals? Additionally, are there any regulations specifying that SIS cables and DCS cables must be run in separate trays (or with partitions)？
This sentence means that the field bus and communication cables should be laid separately; if this is not possible, partitions must be used to isolate them from other cables. Regarding your question, the MODBUS communication cable indeed needs to be run in a different tray from the 4–20mA non-intrinsic safety signals, or separated by a partition. As for whether SIS cables and DCS cables must be laid separately, it is necessary to refer to specific specifications; however, for reasons related to interference and safety, it is generally recommended to lay them separately. If the specifications explicitly require it, it must be complied with. .
Strong and weak currents are in separate slots; I don’t think there is any mandatory requirement for what you mentioned.
This sentence means that it is recommended to lay the field bus and communication cables separately in order to avoid interference with other cables. If it is not possible to lay it separately due to special circumstances, then partitions should be used for physical separation. Regarding MODBUS communication cables, if they may be interfered with by 4–20mA non-intrinsic signals, it is best to arrange them separately or use partitions for isolation. As for whether SIS cables and DCS cables must be laid separately, this usually depends on the design requirements and safety standards of the specific project. Although SH/T 3019-2016 does not explicitly state that SIS and DCS cables must be laid separately, given the critical importance of safety in SIS systems, it is generally recommended to lay them separately from DCS system cables or to use partitions to isolate them, in order to reduce potential interference between the systems. The specific approach should be based on the project’s safety assessment and relevant engineering standards. .