Issues related to the selection of instrument cables
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In general design, the signal cables for instruments are multi-strand flexible cables, while single-core rigid cables are typically used for DI/DO points such as solenoids. Are there any guidelines I can refer to for this?
We did not adopt this approach; I can’t explain the necessity for it. It's sufficient to use multiple strands of soft copper wire
Soft wires are usually woven copper wires, while hard wires are typically single-core. It has been observed that soft wires tend to develop burrs at their joints, which can lead to short circuits. We generally use single-core hard wires for single pairs, and woven copper-core soft cables for multiple pairs; otherwise, the cables become too rigid and difficult to work with when there are multiple pairs
SH/T 3019-2016 \"Code for Design of Instrumentation and Pipeline Systems in Petrochemical Industries\" 6.2.1 Under normal circumstances, multi-strand copper-core polyvinyl chloride (or polyethylene) insulated flexible wires are preferred for electrical wiring； Cables should preferably be multi-strand stranded copper-core cables with polyethylene insulation and polyvinyl chloride sheathing ； Soft cables should be used indoors. HG/T 20512-2014 \"Code for Design of Instrument Piping and Wiring\" 7.2.1 For instrument signal cables, it is advisable to use flexible cables with multiple copper cores, polyethylene insulation, PVC sheathing, and shielding.