| First, let's say a word or two about the essentials of power distribution systems for our young electrical engineers. An electric distribution system, or distribution plant as it is sometimes called, is all of that part of an electric power system between the bulk power source or sources and the consumers' service switches. Where the bulk power sources are located? What's the practice? The bulk power sources are located in or near the load area to be served by the distribution system and may be either generating stations or power substations supplied over transmission lines. Distribution systems can, in general, be divided into six parts, namely, sub-transmission circuits, distribution substations, distribution or primary feeders, distribution transformers, secondary circuits or secondaries, and consumers' service connections and meters or consumers' services. | 
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