![]() In addition, the number of co-ops that have at least 50 miles of underground distribution has increased from 58% in 1995 to 79% as of 2007. The NRECA Strategic Analysis Department has determined that the percentage of co-op-owned distribution lines that are underground has more than tripled in 27 years from 5% in 1980 to 16% in 2007. The use of underground distribution by electric co-ops continues to grow. Next, the engineer must understand how these components can be configured to form different types of UD systems and the special design concerns of each. Before starting a design, the engineer must have comprehensive knowledge of the components of a UD system. This report gives the engineer guidelines for designing a high-quality underground distribution (UD) system.
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