| 摘要 |
PURPOSE:To obtain an equalized cooling effect, with an influence of heat, generated in the bottom room, prevented from affecting to the top room, by providing a ventilating duct, for linking the lower room to a ventilation hole in top of the case, in an inside part of the top room in a plurality of equipment container housings that are separated into the top and the bottom portion. CONSTITUTION:To switch rooms 12A, 12B, separated into the portion of top and bottom, in front of a case 11 that constitutes one unit board of an enclosed switchboard, is installed a door 19A, 19B, having an air intake port 18, and contained a drawer type breaker 21A, 21B. At both side parts in said top switch room 12A, in a position between a separator plate 15 and the breaker, is provided a ventilating duct 25 for constructing an air flow path, which makes a linkage with its bottom to the bottom switch room 12B and its top to a ventilation port 17 of a cover 16. In this way, a ventilation of the bottom switch room 12B is operated through the duct 25, causing the top switch room 21A never to be affected by a heat generated in the bottom switch room 21B, resulting in a good cooling condition, thus capable of obtaining an equalized cooling effect. |
