Optical Fibre and Cable Blowing
OPEN AWARDS
vocational
Optical fibre and cable blowing involves installing fibre optic cables into pre-installed ducts using compressed air. This topic covers duct types, blowing equipment, installation techniques, and safety practices for fibre networks.
2
Learning Outcomes
7
Assessment Guidance
8
Key Skills
2
Key Terms
10
Assessment Criteria
Assessment criteria
Open Awards Level 3 Award in Optical Fibre and Cable Blowing (RQF)
Open Awards Level 3 Certificate in Communications Networks (RQF)
Topic Overview
The Open Awards Level 3 Award in Optical Fibre and Cable Blowing (RQF) focuses on the principles, techniques, and safety practices involved in installing optical fibre cables using blowing methods. This qualification covers the entire process from understanding fibre optic theory to practical cable blowing operations, including preparation, equipment setup, and post-installation testing. It is essential for technicians working in telecommunications, broadband, and data centre industries where high-speed fibre networks are deployed.
Cable blowing is a modern, efficient method for installing fibre cables into ducts using compressed air or specialised blowing machines. This technique minimises cable stress and allows longer installation distances compared to traditional pulling methods. The award ensures students can safely handle fibre cables, operate blowing equipment, and perform continuity and loss testing to verify installation quality. Mastery of these skills is critical for meeting industry standards and ensuring reliable network performance.
This qualification sits within the broader field of computer science and telecommunications engineering, bridging theoretical knowledge of fibre optics with hands-on installation practices. It prepares students for roles such as fibre optic installer, cable blower technician, or network infrastructure specialist. Understanding cable blowing also complements topics like network design, transmission media, and physical layer protocols, making it a valuable component of a well-rounded IT or engineering curriculum.
Key Concepts
Core ideas you must understand for this topic
- →Fibre optic theory: Understand light propagation, single-mode vs. multi-mode fibres, attenuation, and dispersion to select appropriate cable types for blowing.
- →Cable blowing equipment: Master the use of blowing heads, compressors, lubricators, and tension monitors to control cable speed and force during installation.
- →Duct preparation and lubrication: Learn to inspect ducts for obstructions, apply appropriate lubricants, and use mandrels or pigs to ensure smooth cable passage.
- →Blowing parameters: Calculate optimal blowing pressure, speed, and distance based on cable diameter, duct length, and bends to prevent damage.
- →Post-installation testing: Perform continuity checks, optical time-domain reflectometer (OTDR) testing, and insertion loss measurements to certify installation quality.
Learning Objectives
What you need to know and understand
- 1. Understand the principles, advantages and limitations of fibre duct, subduct and blown fibre installation 1.1 List typical sizes and specifications of duct, subduct and microduct 1.2 List typical sizes, specification and construction of blown fibre cables 1.3 Critically compare the different options for duct, subduct and blown fibre cabling for different types of network installation2. Understand the options and techniques for installing duct for a fibre network 2.1 Compare the advantages and limitations of duct installation. 2.2 Carry out duct bundle jointing, branching, mid-span access and split duct repair. 2.3 Explain the importance of gas sealing 2.4 Choose appropriate tools and techniques to complete gas seals 2.5 Explain common duct system quality issues 2.6 Explain how to ensure a high quality of finish with ducting3. Understand the principles of working safely with fibre and cable blowing equipment 3.1 Identify the main environmental, chemical and electrical hazards related to fibre and cable blowing equipment 3.2 Explain safe working practices to minimise the hazards 3.3 Explain when Personal Protective Equipment (PPE) should be used4. Know how to plan a route and select, set up and use the appropriate blowing equipment 4.1 Explain the functions of the blowing equipment components 4.2 Explain how the different components of blowing equipment work together. 4.3 Explain the usage limitations of different types of blowing equipment 4.4 Plan a suitable route for a fibre link, ensuring the appropriate duct and blowing equipment for the distances 4.5 Plan appropriate locations for building entries, blowing access chambers5. Be able to install blown fibre 5.1 Set up equipment for blown fibre installations 5.2 Test fibre blowing equipment for blown fibre installations 5.3 Carry out blown fibre installations following the standard procedure for the task 5.4 Select the most suitable tube joints and seals for the tasks in hand 5.5 Follow correct procedures when completing tube joints and seals6. Be able to install blown microduct and fibre cable 6.1 Set up microduct and cable blowing equipment for blown microduct and blown fibre installations 6.2 Test microduct or cable blowing equipment for a blown microduct and cable installations 6.3 Select most suitable duct lubrication for the installations 6.4 Select correct cable/duct drum supports for the installations 6.5 Carry out a blown microduct and fibre cable installations 6.6 Select most suitable duct joints, water and gas seals 6.7 Follow correct procedures when completing:• Duct joints• Water seals• Gas seals7. Understand the requirement for documentation and labelling 7.1 Explain how to label:• Fibre• Bundles• Cables• Microduct• Duct correctly according to network specifications 7.2 Explain how to document an installed route using standard line diagrams
- 1. Understand the principles, advantages and limitations of fibre duct, subduct and blown fibre installation 1.1 List typical sizes and specifications of duct, subduct and microduct 1.2 List typical sizes, specification and construction of blown fibre cables 1.3 Critically compare the different options for duct, subduct and blown fibre cabling for different types of network installation2. Understand the options and techniques for installing duct for a fibre network 2.1 Compare the advantages and limitations of duct installation. 2.2 Carry out duct bundle jointing, branching, mid-span access and split duct repair. 2.3 Explain the importance of gas sealing 2.4 Choose appropriate tools and techniques to complete gas seals 2.5 Explain common duct system quality issues 2.6 Explain how to ensure a high quality of finish with ducting3. Understand the principles of working safely with fibre and cable blowing equipment 3.1 Identify the main environmental, chemical and electrical hazards related to fibre and cable blowing equipment 3.2 Explain safe working practices to minimise the hazards 3.3 Explain when Personal Protective Equipment (PPE) should be used4. Know how to plan a route and select, set up and use the appropriate blowing equipment 4.1 Explain the functions of the blowing equipment components 4.2 Explain how the different components of blowing equipment work together. 4.3 Explain the usage limitations of different types of blowing equipment 4.4 Plan a suitable route for a fibre link, ensuring the appropriate duct and blowing equipment for the distances 4.5 Plan appropriate locations for building entries, blowing access chambers5. Be able to install blown fibre 5.1 Set up equipment for blown fibre installations 5.2 Test fibre blowing equipment for blown fibre installations 5.3 Carry out blown fibre installations following the standard procedure for the task 5.4 Select the most suitable tube joints and seals for the tasks in hand 5.5 Follow correct procedures when completing tube joints and seals6. Be able to install blown microduct and fibre cable 6.1 Set up microduct and cable blowing equipment for blown microduct and blown fibre installations 6.2 Test microduct or cable blowing equipment for a blown microduct and cable installations 6.3 Select most suitable duct lubrication for the installations 6.4 Select correct cable/duct drum supports for the installations 6.5 Carry out a blown microduct and fibre cable installations 6.6 Select most suitable duct joints, water and gas seals 6.7 Follow correct procedures when completing:• Duct joints• Water seals• Gas seals7. Understand the requirement for documentation and labelling 7.1 Explain how to label:• Fibre• Bundles• Cables• Microduct• Duct correctly according to network specifications 7.2 Explain how to document an installed route using standard line diagrams
Assessment Criteria
Key criteria assessors look for in your portfolio
- List typical duct, subduct, and microduct sizes and specifications.
- Compare advantages and limitations of different duct and blown fibre options.
- Explain the importance of gas sealing and correct sealing procedures.
- Describe safe working practices and PPE for cable blowing.
- Plan a fibre route and select appropriate blowing equipment.
- Award credit for accurately listing duct, subduct, and microduct sizes and specifications with reference to industry standards.
- Credit demonstration of correct duct bundle jointing and branching techniques without compromising cable integrity.
- Credit identification of at least three environmental, chemical, and electrical hazards and corresponding safe working practices.
- Award credit for appropriate planning of a fibre link route, including selection of duct types and blowing equipment for specified distances.
- Credit successful completion of blown fibre and microduct installations following standard procedures, including correct tube jointing and sealing.
Assessment Guidance
Guidance for achieving higher grades
- 💡Memorise standard duct sizes and their applications.
- 💡Practice explaining the sequence of a blown fibre installation.
- 💡Understand the function of each blowing equipment component.
- 💡Always reference real-world scenarios in your answers to demonstrate practical understanding of installation constraints.
- 💡For practical assessments, double-check equipment setup and safety checks before beginning installation tasks.
- 💡Emphasise the critical role of documentation and labelling for network maintenance—expect questions on standard line diagrams.
- 💡When comparing duct options, structure your response using criteria like cost, scalability, and environmental resistance.
- 💡Always reference current industry standards (e.g., BS EN 50173, ISO/IEC 11801) when discussing installation practices to demonstrate awareness of regulatory requirements.
- 💡In practical assessments, show clear step-by-step planning: duct survey, equipment calibration, safety checks, and contingency plans for blockages or cable damage.
- 💡For written answers, use precise terminology (e.g., 'blowing head', 'lubrication pig', 'tension meter') and explain the 'why' behind each step to prove deep understanding.
Common Mistakes
Common errors to avoid in your coursework
- Confusing duct types or using incorrect specifications.
- Neglecting gas sealing or using improper seals.
- Failing to test equipment before installation.
- Confusing microduct and subduct specifications, leading to inappropriate product selection for the installation environment.
- Neglecting gas sealing procedures in duct installations, resulting in moisture ingress and long-term fibre degradation.
- Misusing blowing equipment by exceeding distance or bend limitations, causing fibre stress or breakage.
- Overlooking the importance of duct lubrication, leading to excessive friction and potential damage during cable blowing.
- Incorrect labelling of fibre bundles and ducts, causing future maintenance and identification issues.
- Misconception: Cable blowing can be done at any speed without risk. Correction: Excessive speed can cause micro-bending or cable buckling; always follow manufacturer guidelines for maximum blowing velocity.
- Misconception: Lubrication is optional for short ducts. Correction: Lubrication reduces friction and heat, preventing cable jacket damage even on short runs; always use approved lubricants.
- Misconception: OTDR testing is only needed after installation. Correction: OTDR should be used both during installation (to monitor real-time loss) and after to verify final performance and locate faults.
Frequently Asked Questions
Common questions students ask about this topic
Pass / Merit / Distinction Evidence Checklist
How your portfolio evidence is graded for OPEN AWARDS Optical Fibre and Cable Blowing
Pass (P)
Demonstrate baseline knowledge, accurate terminology, and core practical application.
Merit (M)
Provide detailed analysis, structured explanations, and clear workplace reasoning.
Distinction (D)
Deliver thorough evaluation, original problem solving, and fully justified recommendations.
Before You Start
Prior knowledge that will help with this topic
- •Basic understanding of fibre optic principles (attenuation, bandwidth, connector types) from a Level 2 qualification or equivalent.
- •Familiarity with health and safety regulations in telecommunications environments, including working at heights and confined spaces.
- •Practical experience with hand tools and cable handling (copper or fibre) is beneficial but not mandatory.
Coursework AI Review
Self-check your coursework evidence against P/M/D criteria
Key Terminology
Essential terms to know
- 1. Understand the principles, advantages and limitations of fibre duct, subduct and blown fibre installation 1.1 List typical sizes and specifications of duct, subduct and microduct 1.2 List typical sizes, specification and construction of blown fibre cables 1.3 Critically compare the different options for duct, subduct and blown fibre cabling for different types of network installation2. Understand the options and techniques for installing duct for a fibre network 2.1 Compare the advantages and limitations of duct installation. 2.2 Carry out duct bundle jointing, branching, mid-span access and split duct repair. 2.3 Explain the importance of gas sealing 2.4 Choose appropriate tools and techniques to complete gas seals 2.5 Explain common duct system quality issues 2.6 Explain how to ensure a high quality of finish with ducting3. Understand the principles of working safely with fibre and cable blowing equipment 3.1 Identify the main environmental, chemical and electrical hazards related to fibre and cable blowing equipment 3.2 Explain safe working practices to minimise the hazards 3.3 Explain when Personal Protective Equipment (PPE) should be used4. Know how to plan a route and select, set up and use the appropriate blowing equipment 4.1 Explain the functions of the blowing equipment components 4.2 Explain how the different components of blowing equipment work together. 4.3 Explain the usage limitations of different types of blowing equipment 4.4 Plan a suitable route for a fibre link, ensuring the appropriate duct and blowing equipment for the distances 4.5 Plan appropriate locations for building entries, blowing access chambers5. Be able to install blown fibre 5.1 Set up equipment for blown fibre installations 5.2 Test fibre blowing equipment for blown fibre installations 5.3 Carry out blown fibre installations following the standard procedure for the task 5.4 Select the most suitable tube joints and seals for the tasks in hand 5.5 Follow correct procedures when completing tube joints and seals6. Be able to install blown microduct and fibre cable 6.1 Set up microduct and cable blowing equipment for blown microduct and blown fibre installations 6.2 Test microduct or cable blowing equipment for a blown microduct and cable installations 6.3 Select most suitable duct lubrication for the installations 6.4 Select correct cable/duct drum supports for the installations 6.5 Carry out a blown microduct and fibre cable installations 6.6 Select most suitable duct joints, water and gas seals 6.7 Follow correct procedures when completing:• Duct joints• Water seals• Gas seals7. Understand the requirement for documentation and labelling 7.1 Explain how to label:• Fibre• Bundles• Cables• Microduct• Duct correctly according to network specifications 7.2 Explain how to document an installed route using standard line diagrams
- 1. Understand the principles, advantages and limitations of fibre duct, subduct and blown fibre installation 1.1 List typical sizes and specifications of duct, subduct and microduct 1.2 List typical sizes, specification and construction of blown fibre cables 1.3 Critically compare the different options for duct, subduct and blown fibre cabling for different types of network installation2. Understand the options and techniques for installing duct for a fibre network 2.1 Compare the advantages and limitations of duct installation. 2.2 Carry out duct bundle jointing, branching, mid-span access and split duct repair. 2.3 Explain the importance of gas sealing 2.4 Choose appropriate tools and techniques to complete gas seals 2.5 Explain common duct system quality issues 2.6 Explain how to ensure a high quality of finish with ducting3. Understand the principles of working safely with fibre and cable blowing equipment 3.1 Identify the main environmental, chemical and electrical hazards related to fibre and cable blowing equipment 3.2 Explain safe working practices to minimise the hazards 3.3 Explain when Personal Protective Equipment (PPE) should be used4. Know how to plan a route and select, set up and use the appropriate blowing equipment 4.1 Explain the functions of the blowing equipment components 4.2 Explain how the different components of blowing equipment work together. 4.3 Explain the usage limitations of different types of blowing equipment 4.4 Plan a suitable route for a fibre link, ensuring the appropriate duct and blowing equipment for the distances 4.5 Plan appropriate locations for building entries, blowing access chambers5. Be able to install blown fibre 5.1 Set up equipment for blown fibre installations 5.2 Test fibre blowing equipment for blown fibre installations 5.3 Carry out blown fibre installations following the standard procedure for the task 5.4 Select the most suitable tube joints and seals for the tasks in hand 5.5 Follow correct procedures when completing tube joints and seals6. Be able to install blown microduct and fibre cable 6.1 Set up microduct and cable blowing equipment for blown microduct and blown fibre installations 6.2 Test microduct or cable blowing equipment for a blown microduct and cable installations 6.3 Select most suitable duct lubrication for the installations 6.4 Select correct cable/duct drum supports for the installations 6.5 Carry out a blown microduct and fibre cable installations 6.6 Select most suitable duct joints, water and gas seals 6.7 Follow correct procedures when completing:• Duct joints• Water seals• Gas seals7. Understand the requirement for documentation and labelling 7.1 Explain how to label:• Fibre• Bundles• Cables• Microduct• Duct correctly according to network specifications 7.2 Explain how to document an installed route using standard line diagrams
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