LONG SPAN INSULATED OPEN WIRE TELEPHONE PLANT,
RURAL ELECTRIFICATION ADMINISTRATION WASHINGTON D C
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The experience gained during the construction and operation of the long span field trial at Tyler, Minnesota, has lead to the development of hardware items and construction practices to be used with this type of plant. These have been very effective in preventing fatigue breaks in the line wire due to wind induced vibrations. On wires of small diameter, it has been necessary to eliminate compression type deadends entirely and to provide preformed shunts for all compression type splices and off-set compression sleeves. Armor rods must be used over the insulated wire at every point of support. The armored, insulated wire is tied at every insulator contact, including all four insulators on point transposition brackets. The above measures relieve stress concentration points caused by compression type fittings and reduce the severe vibrations occurring at the insulators. A high density polyethylene has replaced the low density high molecular weight polyethylene for the line wire insulation. The high density material has greatly reduced the construction problems encountered in handling the low density material. Insulated long span construction is proving to be an economical and reliable type of plant that has great promise for use in nine or ten Midwestern States.
- Electrical and Electronic Equipment
- Non-Radio Communications