Regarding the flexible cable, a wire nose should be used
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I’m asking the experts: is there any specification that contains a mandatory requirement, and what is the specification number?
When using multi-core signal cables (so-called flexible wires), wire lugs are required. If a wire nose is not used, it is difficult to compress the wires at the terminal connections, which can lead to poor contact.
There is no strict requirement, but using a wire nose gives better results, according to experience
In the \"SH 3521-2013 Technical Specifications for the Construction of Petrochemical Instrumentation Projects\", 8.9.5 states that multiple conductors inside instrument panels, cabinets, and boxes should be connected to the terminal blocks by using lugs for compression; there shall be no intermediate connectors.