5.1 Introduction5.2 State-of-the-Art Update5.3 Radial-Type Primary Feeders5.4 Loop-Type Primary Feeder5.5 Primary Network5.6 Primary-Feeder Voltage Levels5.7 Primary-Feeder Loading5.8 Tie Lines5.9 Distribution Feeder Exit: Rectangular-Type Development5.10 Radial-Type Development5.11 Radial Feeders with Uniformly Distributed Load5.12 Radial Feeders with Nonuniformly Distributed Load5.13 Application of the A,B,C,D General Circuit Constants to Radial M Feeders5.14 Design of Radial Primary Distribution Systems5.14.1 Overhead Primaries5.14.2 Underground Residential Distribution5.15 Primary System Costs