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Page 47

| Figure 3-6 Platform mounting of transformers. |

| lar need. They are usually constructed of wood, though steel is often used for some of the members. |

| Distribution Transformers: Pad-Mounted |

| Ground-level pads are usually made of concrete or reinforced concrete and have provisions for enclosing the transformers within a fence, wall, or other enclosure for safety reasons. Ground-level pads are very useful when appearance is a major consideration. |

| Distribution Transformers: Underground.. |

| In urban areas, transformers are usually placed in manholes or vaults under the street or sidewalk, and those serving large loads in vaults located within the building; in these instances, subway-type transformers are usually installed. These may be either of the single- or three-phase types. |

| In the subway-type transformer, the core and coils are essentially the same as for the overhead or line type, but the construction of the tank insures its watertightness when submerged for extended periods of time. The tanks have thicker walls, bottom and cover than the line type, and are designed to |

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