FIELD: electricity.
SUBSTANCE: in the device, the heat-conducting metal connection between the housing and the cover of the transit is provided at only one end of the transit. In order to form a heat-insulation gap between the housing and the cover, said gap being divided into two air gaps by a heat-reflecting shield placed therein, the transit is closed at the other end by a layer of a fire-resistant seal which is a continuation of the end sealing of the housing, the length of which is shorter than the length of the cover by the thickness of said layer.
EFFECT: achieving high reliability and efficiency of fire protection with small dimensions of the device, easy assembling and the required strength and air-tightness, avoiding the need to offset almost the entire housing of the transit towards the insulated side.
2 dwg
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