Editing Distribution transformer (section)

==Use==
[[File:CP-SLOPE-wb-gantry-power-supply-transformer-wiki.JPG|thumb|[[Rail transport|Railroad]] signal power supply transformer (CP-SLOPE [[interlocking]]) in west of [[Altoona, Pennsylvania|Altoona]] with a warning label indicating that it contains [[Polychlorinated biphenyl|PCBs]].]]

Distribution transformers are normally located at a [[service drop]], where wires run from a utility pole or underground power lines to a customer's premises. They are often used for the power supply of facilities outside settlements, such as isolated houses, farmyards, or [[pumping station]]s at [[voltage]]s below 30 kV. Another application is the power supply of the overhead wire of [[railway]]s electrified with AC. In this case, single-phase distribution transformers are used.{{sfn|Harlow|2012|p=3-17}}

The number of customers fed by a single distribution transformer varies depending on the number of customers in an area. Several homes may be fed from a single transformer in urban areas; depending on the mains voltage, rural distribution may require one transformer per customer. A large commercial or industrial complex will have multiple distribution transformers. In urban areas and neighborhoods where primary distribution lines run underground, [[padmount transformer]]s, and locked metal enclosures are mounted on a concrete pad. Many large buildings have electric service provided at primary distribution voltage. These buildings have customer-owned transformers in the basement for step-down purposes.{{sfn|Harlow|2012|p=3-17}}

Distribution transformers are also found in [[wind farm]] power collection networks, where they step up power from each wind turbine to connect to a substation that may be several miles (kilometers) distant.{{sfn|Harlow|2012|p=3-10}}