Procedure for designing concrete-encased ductlines for medium voltage cables

The design techniques for concrete-encased ductline systems are different than the standard direct buried URD systems typically found in small commercial and residential developments. Methods are presented to assist in the design of these systems including laying out the systems, determining the proper conduit sizes and configuration, specifications for manholes, locating manholes and switchgear, installation of cable, and provisions for racking the cable. The cost of concrete-encased ductlines is very high and the methods outlined herein will help to reduce the overall cost of construction and improve the performance of the system