Cabling method from the on-site cabinet room to the control room

The ideal design would be something like this; we have tried many times, and it’s easy to lay the conduits in this way, but laying them underground presents some difficulties. First, the electrical engineering field increasingly uses cable trenches for laying cables, so it’s not possible to use those channels. Secondly, a cable trench is built specifically for laying optical fibers (regardless of its size or depth), and it is also necessary to avoid areas with flammable and explosive materials as well as conditions such as high or low temperatures that could cause leaks; therefore, it is very difficult to select such a route based on the overall layout. Third, if direct burial is chosen, protection after it comes into use poses a significant problem. Therefore, we still use overhead conduit installations at present, but we make every effort to divide them into two separate conduit trays as far apart as possible, so that in the event of a fire or similar incident in one circuit, the other can continue to function normally. I wonder what clever strategies other companies have to overcome these challenges; I look forward to insights from experts!

The design criteria for controlling optical cables are proposed by the design institute and reviewed by the owner. 1. Types of optical cables from the cabinet room to the control center: Control optical cables for A: DCS, SIS, CCS, chromatography, and optical cables for complete sets of equipment ； B. Telecommunication optical cables: telephones, CCTV, audio intercoms, wireless coverage extension, corporate local area networks, etc ； 2. Number of optical cables and number of fibers per cable; there should be spares for the fibers. The price of optical cables is not high, but it’s important to have spares both on a per-fiber basis and as a whole set of cables, as construction costs increase later on ； 3. Ordinary lightweight armored fiber for overhead use, heavy armored fiber for underground use ； 4. Single-mode, Multi-mode ； Interface type, ST\SC ； 5. Who is responsible for designing, purchasing, and providing the optical cables and accessories (fiber optic pigtails, junction boxes)? Who is in charge of splicing? 6. There are requirements regarding the bending radius during installation, as well as protection for the cable ends; proper labeling is necessary to avoid using the wrong type of shielding. Splicing and attenuation testing should be carried out promptly after installation, and if any issues arise, the cables should be re-installed to prevent further damage to the cable structure. These are some of the key points to keep in mind; additional details can be found in the attached specifications.

Factories typically have grid ducts in place for telecommunications across the entire facility; optical cables can be routed through them, as can electrical cables

Thank you for providing the standards; it seems that this is more in line with the requirements of telecommunications-related design work – the approach used in instrumentation fields is not professional at all.