Questions about the DCS signal wires of instruments
Thread Content
I have just started working at a private company, and I noticed that many of the signal cables coming from the field using DCS are single-core wires. In my previous company, all signal cables were multi-core. What are the advantages and disadvantages of these two types of wires as instrument signal cables?
Are you saying a direct two-core cable goes into the DCS without a junction box?
I think what the original poster is asking about is the difference between solid wires (with a single core) and stranded wires (with multiple twisted cores). I believe the main difference lies in whether you prefer solid or stranded wires when it comes to wiring
For multi-core wires, an explosion-proof terminal box needs to be added on site, while this is not necessary for single-core wires, thus reducing the number of failure points
Single pair costs 6 to 7 yuan per meter, while multiple pairs cost 4 yuan per meter per port.
Thank you all. I roughly understand it now – flexible cables are easy to route, while single-core rigid cables are not
1. Design reasons: In some designs, there is no intermediate junction box; the wires go directly from the field meters to the DCS terminal cabinet. In other designs, an intermediate junction box is used, with single-core cables running from the meters to the junction box, and multi-core cables running from the junction box to the DCS terminal cabinet. 2. Considerations related to construction； 3 Considerations regarding price.
It’s about your company saving money – multi-core signal cables are definitely better than single-core ones; they’re also softer and easier to connect.
There are few single-pair core failures. There are problems online, and sometimes they’re really unexplainable.
This post was last edited by cqdfwy on 2020-6-12 at 17:10. Additionally, if there is vibration in the field environment, the screws securing the terminals of single-strand solid wires can easily come loose and cause a break in the connection; whereas multi-strand flexible wires, being softer, will not break apart due to slight loosening, unless the screws are completely undone. Therefore, for on-site signal wires, multi-strand flexible core cables are more suitable.