All loops of cable must be secured to a pole at the end of the span. Overlashing must consider the current cable loading, the weight of the cable intended to be added and. harness on all bucket trucks and aerial lifts. A craftsman can remain in such an area (for example, to observe the alignment of a cable around a corner block). Every joint-use utility pole is divided into three zones from the ground up: the roadway clearance zone at the bottom, the communication space in the middle, and the supply space at the top where electric conductors live. Fiber optic cables are classified as communication cables and are placed in. The choice depends on vehicle access to the pole line, the type of equipment available to the installer, and whether the cable must be pulled into position over existing facilities. Cable installation in aerial innerduct is permitted in certain circumstances as discussed in Section 10. Installation. Deploying fiber above ground on poles or towers removes the need for underground digging and is particularly useful when the ground is uneven, rocky or both. 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. Individual company practices for placing.