Example underground trunk installation method

Example underground trunk installation method

• Attach a pulling eye or other similar fitting on one end of the optical cable.
• Use an anti-twist fitting or the like, as shown above right, to avoid twisting in the optical cable during installation.
• Place the cable drum right above the opening of the conduit, as shown above left, in order to unwind the cable in a smooth curve from the drum. When unwinding, take care so as not to twist or form a kink in the cable. Moreover, use a corrugated flexible pipe and a bellmouth fitting to protect the cable.
• To lay an optical cable over a long distance, pull the tension member instead of the cable sheath and monitor the tension in the cable to avoid over-tension. Over-tension can result in detaching the pulling eye or squashing the cable. The maximum allowable tension differs according to the cable type, and specifications are given for individual cables. For more detailed information, refer to the relevant specifications.
• For installation along railroad tracks or in other places where strong vibrations can cause fibers to move, use a ribbon slotted-core cable (helical) with fibers secured or an SZ slotted-core ribbon cable.