ABSTRACT
As discussed in Chapter 5, a utility company strives to achieve a well-balanced distribution system in order to improve system voltage regulation by means of equally loading each phase. Figure 7.1 shows a primary system with either a three-phase three-wire or a three-phase four-wire main. The laterals can be either (1) three-phase three-wire, (2) three-phase four-wire, (3) single phase with line-to-line voltage, ungrounded, (4) single phase with line-to-neutral voltage, grounded, or (5) two-phase plus neutral, open wye.
