This guide explains the common cable constructions, when to choose direct-burial, a practical installation workflow, and the best practices that minimize downtime and future repair costs. The methods described are intended for guideline use only, as it is impossible to cover all the various conditions that may arise during an installation. All in plant process automation networks shall be redundant and shall be routed in. Recommendation ITU-T L. Trenching involves digging a trench, placing the cable, and.