Glass yarns also protect the cable core against rodents and termites.
2.
However, this type of construction means that, during the bending process, the inner radius compresses and the outer radius stretches as the cable core moves.
3.
The cable cores are stranded firmly and left relatively long in several layers around the center and are then enclosed in an extruded tube shaped jacket.
4.
Nine of the present four-inch-diameter copper power lines connecting a key transformer station with the distribution grid in Detroit will be replaced by three superconducting lines chilled with liquid nitrogen circulating through the cable cores.
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