IEC 60794-5-20:2014（E）是一个系列规范，涵盖了室外微管光纤单元和相应的微管，以及通过吹风安装的受保护微管。受保护的微管适用于管道、直埋或捆绑应用。微导管光纤单元与微导管光缆（见IEC 60794-5-10）的不同之处在于，它们对所含光纤提供的保护较少。具体而言，微导管光纤单元依赖于微导管的结构、受保护的微导管或适当的外壳来支持安装，并在产品的使用寿命期间为光纤提供额外的机械保护。 使用本标准所涵盖组件制造的系统应符合分规范IEC 60794-5的要求（如适用）。 关键词:室外微导管纤维装置，吹风安装

IEC 60794-5-20:2014(E) is a family specification that covers outdoor microduct fibre units and corresponding microducts and protected microducts for installation by blowing. The protected microducts are intended for duct, directly buried or lashed applications. Microduct fibre units differ from microduct optical fibre cables (see IEC 60794-5-10) in that they provide less protection to the fibres that they contain. Specifically, microduct fibre units rely on the structure of the microduct, protected microduct or appropriate housing to support installation and to provide additional mechanical protection for the optical fibre over the lifetime of the product. Systems built with components covered by this standard are subject to the requirements of sectional specification IEC 60794-5 where applicable. Keywords: outdoor microduct fibre units, installation by blowing