IEC TR 62691:2011 PDF

Overview

IEC TR 62691:2011 - "Optical fibre cables - Guide to the installation of optical fibre cables" - is a technical report from the IEC that provides practical guidance for planning and performing installations of optical fibre cables (the family covered by the IEC 60794 series). It addresses general installation practices and gives particular attention to the blowing technique used to install fibres and microcables into ducts. The report is aimed at reducing installation-related damage and ensuring long-term cable performance.

Key topics and technical scope

The report organizes guidance across planning, methods, safety and special situations. Key technical topics include:

• Installation planning: route considerations, installation specifications and training requirements.
• Cable tension and mechanical limits: guidance on cable tension predictions for duct installations, maximum cable tension, and factors affecting pulling, pushing and blowing operations (figures and tables provide calculation methods).
• Installation temperature: considerations for safe handling and allowable conditions during deployment.
• Cable installation methods: step-by-step guidance for underground ducts (including trenchless techniques), aerial installation, buried and indoor cabling, and methods to maximise installed lengths.
• Blowing systems and techniques: detailed practical guidance on installing cables by compressed-air blowing (including cascade blowing and riser/tube installations).
• Cable handling and protection: winching, guiding, lubrication, cable bending and overload protection.
• Safety and environment: confined-space safety, special situations (tunnels, bridges, sewers, gas/drinking-water pipes, industrial environments) and lightning protection.
• Supporting materials: figures and tables for tension calculations, installation illustrations, and jointing length allowances.

Practical applications and users

IEC TR 62691 is immediately useful for:

• Network planners and designers specifying routes and installation methods for fibre-optic networks.
• Installation contractors and field technicians performing duct, aerial, buried or indoor installs, especially using blowing or duct-pulling methods.
• Project managers and asset owners developing installation specifications and risk assessments.
• Specifiers and procurement teams evaluating cable and equipment mechanical requirements.
• Trainers and safety officers responsible for installer competence and confined-space procedures.

Practical takeaways emphasize following cable manufacturer tensile ratings, not exceeding mechanical limits during installation, and using appropriate blowing/pulling equipment to prevent latent damage that can shorten service life.

Related standards

• IEC 60794 series (optical fibre cable specifications)
• IEC 60794-3-40, -3-50, -3-60 (family specifications for sewer, gas-pipe and drinking-water installations)
• IEC/TR 62362 (selection guidance for cable specs)
• IEC/TR 62470 (friction coefficient measurement guidance)
• ISO/IEC 24702 (generic cabling - industrial premises)

Keywords: IEC TR 62691, optical fibre cables, installation guide, blowing technique, cable tension, duct installations, fibre optic installation.