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| Figure 3-8 Typical distribution substation installation. |

| floor. Because of the barriers, ventilation is difficult and usually accomplished with the aid of fans and often also with air ducts. Such indoor installations may be necessary when substations are located in residential or other areas where appearance and noise are paramount considerations. |

| Perhaps the greater number of substation installations are made outdoors (Fig. 3-8). Here the units are mounted on concrete pads, with the larger units sometimes equipped with wheels and the unit mounted on rails for ease in handling. Barriers to prevent the spread of fire are not very common in this type installation, but the area containing the transformer is encompassed by earthen dams or concrete curbs forming a basin to contain all the oil which may flow from the unit in trouble. Acoustic barriers (Fig. 3-9), to keep the |

| Figure 3-9 Substation power transformer with acoustical barrier. |

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