167 Copyright Goodheart-Willcox Co., Inc. Chapter Outline 12.1 Defi finitions 12.2 Branch Circuits 12.2.1 Branch-Circuit Rating 12.2.2 Branch-Circuit Voltage 12.2.3 Conductor Size and Ampacity 12.2.4 Multiwire Branch Circuits 12.2.5 Conductor Color Code 12.3 Branch-Circuit Loads 12.3.1 Lighting Loads 12.3.2 Receptacle Loads 12.3.3 Equipment Loads 12.3.4 Heating and Cooling Loads 12.4 Feeders 12.5 Summary of Commercial Service Load Computation Procedure 12.6 Sample Problems Objectives After completing this chapter, you will be able to: Identify the feeder and branch circuit portions of a distribution system. Describe the various types of branch circuits. Defi the functions of a feeder and the functions of fine branch-circuit conductors. Calculate lighting and receptacle loads using Code requirements. Size branch circuits in accordance with the Code. Determine branch circuit overcurrent protection required by the Code. Use the Code to size feeder conductors. CHAPTER 12 Branch Circuits and Feeders Technical Terms branch circuit continuous load feeders general lighting load show-window lighting load track lighting Ilights, n an electrical system, power must be trans- ferred from the service equipment to the machines, and outlets. Regardless of the wiring methods used, the conductors car- rying the power fall into one of two categories: feeders or branch-circuit conductors. This chap- ter will explore the characteristics of these two conductor types. 12.1 Defi nitions Several defi are essential to understand- finitions ing branch circuits and feeders. The following items are illustrated in Figure 12-1: Service conductors—These conductors extend from the power company terminals to the main service disconnect.
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