Connections
Both pole-mount and pad-mount transformers convert the high 'primary' voltage of the overhead or underground distribution lines to the lower 'secondary' voltage of the distribution wires inside the building. The primaries use the three-phase system. Main distribution lines always have three wires, while smaller "laterals" (close to the customer) may include one or two phases, used to serve all customers with single-phase power. If three-phase service is desired, one must have a three-phase supply. Primaries provide power at one of a wide range of standard voltages from 4 to 33 kilovolts, but the most widely used are 7,200 or 14,400 volts.
Read more about this topic: Distribution Transformer
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