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Sample text
Requirements for overhead ground wires are covered in chapter 9. Crossarm construction as shown on figure 6-4 will be limited to equipment installations, or where use of armless construction would result in excessive pole heights. However, other technical considerations, such as a line with many taps, crossings, or overhead-to-underground transitions, may impact the decision. Also, armless construction requires bucket trucks for maintenance due to loss of climbing space. (1) Angles at which guying is required.
An example of an aerial conductor strength analysis is given in figure 6-1. Pole line analyses will be provided and will show calculations for pole strengths, guying, span length, and sags. 06 feet) and then checking the validity of the assumption, which can be tedious and time-consuming. Conductor manufacturers have computer programs which have been developed to perform these calculations. 4 feet of sag and 2,870 pounds tension. The variation results because of elastic creep; however, the variation in values of about 15 percent, in this case, provides a more conservative design or an additional safety factor.
Criteria for electric distribution lines will be based on the requirements of agency criteria. Distribution lines will be sized to meet current demand load, future loads, and line-loss factors. a. Aerial line requirements. Aerial lines will be used in all areas, except in the following instances: (1) Where aerial lines would constitute hazards such as near flight lines (where poles must be outside of the glide path) or near munitions buildings (where poles can be no closer than the length of the lines between the poles which support the lines unless effective means is provided to assure that energized lines cannot, on breaking, come in contact with the facility or its appurtenances).