Outdoor optical cable laying for control system
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The signals from each individual control system are transmitted to the control room via optical cables, using a ring network. According to the standards, redundant communication cables should be laid along separate paths; whether adding a partition in the middle of a cable tray counts as such is a question raised during construction, and I believe it does not count. 2. Can optical cables be placed in the electrical low-voltage cable trays? The contractor found that the trays were mostly filled with optical cables as well. I checked the petrochemical industry standards, which state that optical cables should not be installed separately in cable trays; they need to be separated from other cables using partitions, in order to prevent damage. I think it’s feasible to lay the low-voltage cable trays separately using partitions. I wonder if anyone else has encountered a similar issue and how they handled it
The conventional approach for optical cables is to use two tracks: one above ground and another below. The cable running above ground is placed in an overhead cable tray, and it is preferable to lay it separately; however, it can also be laid together with other optical cables used for telecommunications, fire protection, etc； It’s laid underground beneath the utility tunnel; there needs to be a cable trench.
The optical cable is fine – it’s not affected by signal interference! The rest depends on individual regulations
All construction work must follow the design drawings and be carried out in accordance with the design documents. For communication fibers of control systems such as DCS, SIS, and GDS, a redundant dual-path configuration with one fiber per day is the standard; if this requirement is not met, the fibers should still be laid in separate cable trays and follow different paths.
Generally, control systems such as DCS, SIS, GDS, and PLC require redundant communication fibers from CCR to FAR to follow different paths; it is reasonable to design them as \"one path per location\", with the fibers running in telecommunication trenches underground and requiring heavy armor protection. The purpose is for safety, so that if one path encounters a failure, the other can continue to function properly. The control system within the FAR requires the ability to operate independently in the event of a failure in either of the two optical cables or communication links, thereby ensuring safety. Generally, the FAR is close to the on-site device.