Tape-armored telephone toll cable

BURIED tape-armored cables possess several advantages over cables carried on pole lines or in underground conduit: 1. Easements for buried tape-armored cable on private rights-of-way may sometimes be obtained more cheaply than for pole lines, as the use of the land for ordinary agricultural activities is not disturbed. 2. Induced currents from paralleling power lines are appreciably less than in unarmored aerial or underground cables, due to the shielding effect of the steel tapes. 3. Cable may be laid to follow the contour of rough country and have sharp bends to avoid obstructions, while conduit must have a fairly even grade and long radius curves to permit cable being pulled through it. 4. Manholes are required at spacings of from 500 to 700 ft. if conduit is provided, while with tape-armored cables, manholes may be omitted except at loading points which normally occur at 6,000-ft. intervals.