| 摘要 |
The junction box (10) for optical fibre cables (8, 9) comprises an outer metal shell (20) containing a coupling cassette (12) for the optical fibres (80, 90) and an inlet system (7) for at least two cables (8, 9) that prevents hot air penetration. It has an inner shell (30) of a heat resistant material with low thermal conductivity, able to resist temperatures of at least 900 deg C without giving rise to a significant increase in the optical fibres' attenuation. The inner shell, which is in contact with the metal outer shell for the greater part of its surface, is made from calcium silicate, refractory steel or brick, glass, cellular concrete, ceramic, rock wool or glass wool, or polymer foam.
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