How to Install Armored Fiber Optic Cables: A Step-by-Step Guide

Armored fiber cables offer enhanced protection and durability, making them ideal for demanding environments. However, correct installation is essential to ensure long-term reliability and performance. This article provides practical guidance on how to install armored fiber cables safely, covering key considerations, step-by-step procedures, and addressing common questions.

Choose the Right Armored Fiber Optic Cable

Before starting the installation, it’s essential to select the right type of armored fiber cable based on your application environment. The correct choice ensures reliable performance, easy handling, and longer service life. Generally, armored fiber cables are divided into two main categories: indoor armored cables and industrial armored cables.

Indoor Armored Fiber Cables

Designed for data centers, office cabling, surveillance systems, and medical facilities, indoor armored cables feature a metal protective layer to prevent fiber damage. They can resist light dust, oil, moisture, and rodent bites, offering extra protection without sacrificing flexibility.

Industrial Armored Fiber Cables

Built with a tougher TPU outer jacket, industrial armored cables provide superior tensile strength, crush resistance, and flexibility. They are waterproof and abrasion-resistant, making them suitable for extreme environments such as factories and outdoor installations. These cables can even be directly buried or routed through conduits without the need for rigid protection.

For a detailed overview of armored cable, see What Is Armored Fiber Cable?

Key Installation Considerations for Armored Fiber Optic Cables

Understand Its Pull Strength Rating

Never pull directly on the optical fibers themselves. It’s recommended to start pulling from the middle of the cable rather than from the ends to reduce stress and prevent fiber damage. Always check the cable’s rated tensile load before installation, as different products support different pull strengths. For example, FS armored cables typically support up to 120N (long-term) and 225N (short-term), while industrial cables offer higher tensile resistance—around 200N/400N for simplex and 500N/800N for duplex types. Whenever possible, pull the cable smoothly and avoid twisting or pushing it through conduits to maintain performance and reliability.

Know Its Bend Radius

Each armored fiber optic cable has a specified minimum bend radius that must be strictly followed during installation. Exceeding this limit can damage the internal fibers and impair signal performance. When routing cables around corners or obstacles, always maintain smooth curves and avoid excessive twisting while unspooling. For guidance: FS single-mode armored cables generally require a bend radius of 10D (dynamic)/5D (static), multi-mode armored cables: 20D (dynamic)/10D (static), and industrial armored cables typically follow 20D (dynamic)/10D (static).

Plan Its Cable Route in Advance

A well-planned route minimizes installation errors and future maintenance costs. Measure cable lengths carefully, identify obstacles, and map out connection points before installation. It’s better to leave a little extra length than to come up short—excess cable can be coiled neatly, but a shortage may require time-consuming splicing.

Control Environmental Conditions

Pay attention to the installation environment, including temperature and humidity. Avoid deploying cables in areas that exceed the product’s rated temperature range or are frequently exposed to water unless using waterproof cables.

Step-by-Step Guide to Installing Armored Fiber Cables

After selecting the right cable type and reviewing all installation precautions, you can proceed with the actual installation. The following steps take non-terminated armored fiber cables as an example to illustrate how to ensure safe, efficient, and reliable deployment.

Step 1: Prepare and Measure

Prepare necessary tools and materials, such as fiber cutters, fiber strippers, fiber cleavers, cleaning kits, and a fiber inspection tool. Verify that each tool is in good working condition and suitable for armored cable handling. Measure the required cable length according to your layout plan and mark the cable clearly to guide cutting.

Step 2: Cut and Strip Cable

Use a fiber cable cutter to cut the armored cable to the marked length. Adjust the blade depth to match the armor thickness, and apply steady pressure for a clean cut. Then, use an appropriate stripping tool to remove the outer jacket and expose the inner armored layer. For Kevlar strength members, use scissors specifically designed for cutting Kevlar to prevent tool damage or frayed ends. Carefully strip the protective layers, avoiding any contact with the optical fibers.

Step 3: Prepare Fiber End Faces

Clean and inspect the exposed fiber ends using a fiber cleaning kit and microscope. Ensure the end faces are free from dust, oil, or debris before proceeding to termination or fusion splicing.

Step 4: Terminate or Splice Fiber

Follow the manufacturer’s instructions for connector installation or fusion splicing. When splicing, use a fusion splicer and microscope to ensure precise alignment.

Step 5: Test and verify Performance

After completing all terminations or splices, perform optical testing using an Optical Time-Domain Reflectometer (OTDR) or power meter. Verify that signal continuity is stable and that insertion loss is within acceptable limits before final deployment.

FAQs About Armored Fiber Optic Cables

Q: Can armored fiber optic cables be installed in wet environments?

A: Yes. Armored fiber optic cables are designed for harsh conditions and can operate reliably in damp or semi-exposed environments. Their armored structure protects the fibers from moisture, water, and mechanical damage. For outdoor or humid installations, it’s essential to use cables and connectors that meet proper IP protection ratings and minimize exposure to water or dust intrusion. FS industrial armored cables use TPU outer jackets and optional IP67-rated connectors, delivering waterproof and durable performance for outdoor humidity applications.

Q: Armored vs. Non-armored Cables: What’s the Difference?

A: The main difference lies in their level of protection and application environments.

Armored fiber optic cables are designed for harsh or high-risk environments. They feature a metal or non-metallic armor layer that protects the fibers from crushing, rodents, and other mechanical impacts. These cables are ideal for industrial sites, outdoor installations, underground ducts, or areas exposed to moisture and vibration.

Non-armored fiber optic cables, on the other hand, are lightweight and more flexible, making them suitable for indoor use or areas with minimal physical risks. They are easier to install and more cost-effective for short-distance or protected routes. However, without armor protection, they are more vulnerable to bending, pressure, or external damage.

For an in-depth comparison, see Armored vs. Unarmored Fiber Optic Cable: Which One Should You Choose?