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Project: T143700 #3411-2
 

In most North American cities, underground power transmission depends on highly engineered cable systems capable of functioning reliably under extreme conditions during a lifetime of 50 or more years. The components that make up these cable systems are manufactured in specialized factories from highly refined materials, using precision equipment and subjected to rigorous quality control measures. Before shipment, all cables and accessories are tested to verify compliance with industry standards and to ensure they are shipped to the worksite in excellent condition. It is important that the physical environments into which these components are to be installed have characteristics that minimize the risk of installation damage and have thermal characteristics that will achieve the specified transmission ratings. Many of the civil techniques used to construct trenches, boreholes, tunnels, manholes and other structures for cable installations are variations of methods used for pipeline and sewer construction. Due to the unique requirements of underground power transmission, these techniques need to be modified to provide a satisfactory installation environment and the specified transmission ratings. Specialized skills and experience are needed to ensure that transmission cable installations are both technically satisfactory and specification compliant. Project managers, administrators, inspectors, and procurement officials require knowledge of the varied technical aspects of transmission cable installations and this reference manual is intended to provide them with a practical overview.

Keywords:

Project Planning; Specification Development; Permitting; Civil Works; Pipe-Type Cables; Pipe-Type Cable Subassemblies; Cathodic Protection; Single-Conductor Cables; Reservoirs; Sheath Bonding; Backfill Compaction; As Built Drawings; Factory Testing; Field Inspection; Quality Control.