![]() ![]() The manual is divided into six main sections, consistent with the sequence in this article. In addition, specific design and implementation information is provided for a cost-effective, space efficient hybrid joint-use system for utility cables that provides many advantages relative to previous or existing methods of belowground construction. ![]() ![]() Related design, construction and operational requirements and guidelines are also provided, as well as a brief description of various methods and technologies for placing cables into the conduits. The objective of the manual, or guide, is to present a brief description of present and past practices for the placement of utility cables belowground, including conventional underground conduit systems and direct-buried methods, as well as more recent techniques in which individual pipes or ducts may be advantageously deployed in conjunction with “direct-buried” cables. Department of Transportation and the FHWA Turner-Fairbank Highway Research Center. 118 for Belowground Pipeline Networks for Utility Cables - commonly referred to as “MOP No. In support of belowground installations, including the encouragement of innovative designs and methods for enhancing the deployment and utilization of such pipelines, the American Society of Civil Engineers (ASCE) has recently published the ASCE Manuals and Reports on Engineering Practice No. Although the terminology suggests that there is a clear distinction between the mode two (underground conduit system) and mode three (direct-buried cables) methods of construction, in practice there have been variations in each category that tend to blur the differences. Due to the significantly different characteristics of the two belowground methods, mode two has been specifically designated as “underground (conduit) plant” to distinguish this method from mode three comprising individual “direct-buried” cables. These include:ġ.Ěerial/overhead plant in which the cables are individually suspended between utility poles placed on the order of 100 – 300 feet apart Ģ.ěelowground plant consisting of an array of parallel conduit paths, typically four to 6-inch diameter pipe, spanning the distance between relatively large manholes, separated by distances on the order of 500 to 1,000 feet andģ.ěelowground plant installed by directly burying the cables within the soil, including cable along a road, highway or street, or service drops to the home.Īll three modes have been commonly used in the industry, with an increasing amount of belowground facilities being placed relative to aerial plant in more recent decades, primarily driven by regulations. There are basically three modes of construction for “outside plant” facilities for communications and electric power supply lines. ![]()
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