| 摘要 |
In the laying of communications cables in the interior of pipes, in which hot substances are conveyed, it is important to provide communications cables of this type with long-term protection against the surrounding aggressive heat. The communications cable is not laid directly in contact with this aggressive hot environment in that at least one continuous cavity is arranged around the cable core of the said communications cable, which cavity is sealed by a sleeve. In order to be able to extract heat which inevitably diffuses over time from the hot environment into the said cavity, a medium is advantageously conveyed through the cavity. Only in this way is it possible to maintain a constant temperature around the cable core on a long-term basis and to accordingly obtain a long-life communications cable laid, for example, in district heating pipes.
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