柔性绝缘套管 - 第3部分:各种类型的套管规格 - 第247页:热收缩聚烯烃套管 双壁 不阻燃 中厚壁

[中文适用范围]： 本文档规定了两种热缩聚烯烃双壁、不阻燃、收缩比额定值为 3:1 的绝缘套管的技术要求。该套管适用于温度高达 100 °C 的使用环境。 类型 A：中等壁厚，内径通常可达 200.0 mm。 类型 B：厚壁，内径通常可达 200.0 mm。 这些套管通常以黑色供应。由于这些类型的套管覆盖了相当大范围的尺寸和壁厚，附件 A（表 A.1 和表 A.2）提供了可用尺寸范围的指南。实际尺寸将由用户和供应商商定。 符合本规格的材料达到了既定的性能水平。但是，用户为特定应用选择材料将基于该应用所需的实际要求，以获得适当的性能，而不仅仅基于本规格。 [外文原描述]： IEC 60684-3-247:2019 gives the requirements for two types of heat-shrinkable, polyolefin sleeving, dual wall, not flame retarded with a nominal shrink ratio of 3:1. This sleeving has been found suitable for use at temperatures of up to 100 °C. - Type A: Medium wall, internal diameter up to 200,0 mm typically. - Type B: Thick wall, internal diameter up to 200,0 mm typically. These sleevings are normally supplied in colour black. Since these types of sleving cover a significantly large range of sizes and wall thicknesses, Annex A (Tables A.1 and A.2) provides a guide to the range of sizes available. The actual size will be agreed between the user and supplier. Materials which conform to this specification meet established levels of performance. However, the selection of a material by a user for a specific application will be based on the actual requirements necessary for adequate performance in that application and not based on this specification alone. This second edition cancels and replaces the first edition published in 2011 and Amendment 1:2016. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous editions: - removal of the colour fastness to light test, as this is covered by the test for carbon black content; - change of low temperature flexibility test to -20 °C to align with sheet 214; - change of final conditioning temperature of peel strength samples to 200 ºC to align with the temperature in Clause 5; - removal of the fungus resistance test as there is no evidence that fungus growth is an issue either by testing or in use. Keywords: Heat-shrinkable, polyolefin sleeving, dual wall, not flame retarded, thick and medium wall