Medium-voltage fireproof cable for green building

Abstract

The invention discloses a medium-voltage fireproof cable for a green building. From the inside to the outside, the cable sequentially comprises a cable core, a metal heat conducting layer, a low-smoke halogen-free thermal insulating layer, a metal fire-blocking layer and a low-smoke halogen-free external sheath layer, wherein the cable core consists of an insulating wire core and a mineral filling layer. The metal heat conducting layer is a metal tape which is arranges spirally, wherein the thickness of the metal tape is 2mm, and the interval between the peak and valley of the spiral is 3-5 mm. The external diameter is 13-15mm greater than the external diameter of the cable core after the metal heat conducting layer is set. According to the invention, the performance of the cable meets the requirements of fireproof, impact and water spraying testing of the standard BS8491: 2008. The test fire temperature is 830-870 DEG C, and the fire resistance test is carried out for 120min. The cable can withstand impacts for 12 times and water spraying for three times while withstanding the fire resistance test, and is a real medium-voltage fireproof cable.

Description

technical field [0001] The invention relates to a medium-voltage fireproof cable for green buildings. Background technique [0002] Usually, the performance of medium-voltage fire-resistant cables meets the requirements of rated voltage 6kV (Um=7.2kV) to 35kV (Um=42kV) extrusion negative insulation fireproof power cables. The technical specification stipulates that the test temperature and time of medium-voltage fire-resistant cables are: 750 ° C, 90 minutes, no impact and water spray during the test, the medium voltage fireproof cables produced by domestic enterprises are also tested according to this technical specification, which is essentially a medium voltage fireproof cable, which cannot achieve the effect of fireproofing. Contents of the invention [0003] The object of the present invention is to provide a medium-voltage fireproof cable for green buildings. [0004] The technical solution for realizing the purpose of the present invention is: a medium-voltage fire...

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Problems solved by technology

[0002] Usually, the performance of medium-voltage fire-resistant cables meets the requirements of rated voltage 6kV (Um=7.2kV) to 35kV (Um=42kV) extrusion negative insulation fireproof power cables. The technical specification stipulates that the test temperature and time of medium-voltage fire-resistant cables are: 750 ° C, 90 minutes, no impact and water spray during the test, the medium voltage fireproof cables produced by domestic enterprises are also tested according to this technical specification, which is essentially a medium voltage fireproof cable, which cannot achieve the effect of fireproofing

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