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Optical fibre cables - Sectional specification. Microduct cabling for installation by blowing Ingestion-build-181247 BS EN 61280-1-1:2013 includes some1 Scope This part of IEC 60794, which is a sectional specification, specifies the requirements of microduct optical fibre cables, microduct fibre units, microducts and protected microducts for installation by blowing for outdoor and or indoor use. The microduct optical fibre cables and microduct fibre units utilize the structure of the microduct or protected microducts to support installation and to provide protection over the design lifetime. These