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This recommended practice provides a set of guidelines that can be used by the operators of new start-up systems seeking guidance in developing manuals, methods, practices, and procedures for the safe and effective maintenance of their Overhead Contact System (OCS), or by the maintenance organizations of existing well-established systems to amplify or refine their existing practices. This recommended practice provides general recommendations for performing maintenance work on dc OCS for transit systems. These recommendations are based on sound engineering principles, engineering safety considerations and field experience by many transit agencies. Included are technical explanations to cover certain testing of tools and equipment; field maintenance and care of tools and equipment; work methods for the maintenance of the OCS; and recommended safety practices and procedures for persons working in the vicinity of energized lines. Since local conditions and circumstances differ from one transit agency to the next, acceptance or rejection of any or all of the recommendations contained therein is left to the discretion of the individual agency, which should determine their applicability to its proposed or existing operating practices and procedures. It is not intended that the guidelines replace present proven transit agency procedures or that the recommended practices form the basis for a mandatory standard. Keywords: auto-tension, backbone, balance weight, cantilever, catenary, contact wire, crossspan, door bridge, electric trolleybus, electrification, ETB, fixed termination, headspan, hi-rail, insulator, jumper, maintenance, messenger wire, OCS, overhead contact system, pantograph, qualified person, section insulator, special work, surge arrester, trolley, trolley pole.

Overhead projection.

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Overhead projection.

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The purpose of this standard is to present a simplified method of calculating the current-temperature relationship of bare overhead lines when given the weather conditions. This standard includes a mathematical method, and indicates sources of the values to be used in the calculation. Because there is a great diversity of weather conditions and operating circumstances for which conductor temperatures must be known, each utility shall make its own assessment of the data that will best pertain to its area or a particular transmission line.

Overhead electric lines.

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With the increasing interest and concern regarding the vibration of overhead conductors, and the emphasis on the improvement of existing methods and the development of new techniques for controlling the problem, there is a growing requirement for reliable information on the self-damping characteristics of conductors. This parameter is a principal factor in determining the response of conductors to alternating forces, such as arise from wind flow over conductors. This guideline has been prepared for the purpose of encouraging investigators contemplating making measurements of the inherent damping characteristics of conductors, to adopt the methods outlined. It is anticipated that the resulting information, being in a compatible and consistent form, will provide a reliable basis for studying the vibration and damping of conductors in the future and for the comparison of data of various investigators.

Overhead electric lines.

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Overhead electric lines