| 摘要 |
<p>The box has a housing (1) enclosing a hollow space (2) with a front wall (3), a rear wall (4) and side walls (5), where the walls are formed of fire-resisting fire protection plates. A cable bushing (6) is provided for the hollow space at the side walls. The housing is formed of three layers of fire protection plates lying on top of each other, where the fire protection plates belonging to a middle layer for formation of the space have a recess (7). Each layer has two through holes, which are aligned together, and a connecting unit connects the layers with one another.</p> |
