Fiber optic cable protective armor grounding

Armored fiber optic cables require proper bonding and grounding to ensure safety, protect equipment, and maintain network reliability.

Types of Armored Fiber Cables

• Interlocking Armor: Aluminum armor helically wrapped around the cable, commonly used for indoor and indoor/outdoor applications. Offers ruggedness and crush resistance .
• Corrugated Armor: Coated steel tape folded longitudinally around the cable, typically used outdoors. Provides extra mechanical protection and rodent resistance .
• Dielectric-Armored Cable: Offers protection without metallic components, eliminating the need for grounding and bonding .

Importance of Grounding

Metallic armor in fiber optic cables acts as a non-current-carrying protective layer. Grounding ensures that any accidental electrical contact is safely discharged, protecting telecommunications equipment, IT systems, and surge protection devices . Proper grounding also complies with industry standards such as ANSI/TIA-607-D and local authority requirements .

Grounding and Bonding Procedure

1. Expose the Armor: Carefully slit the outer jacket and heat shrink (if present) to expose the metallic armor without damaging the inner fiber .
2. Install Bonding Clamp: Insert the bottom plate of the clamp under the armor, then secure the top plate using the provided nuts. Ensure only the armor is compressed, not the inner jacket .
3. Wrap and Secure: Use tape to wrap the heat shrink, armor, and bonding clamp, leaving the bonding stub and nut exposed to maintain electrical continuity .

Grounding Kits

Several manufacturers provide armored cable grounding kits for indoor and outdoor use:

• Panduit ACGK StructuredGround™ Kit: Includes a 6 AWG terminal and #10 mechanical clamp with a worm-gear design for even force distribution, suitable for both indoor and outdoor installations .
• Corning FDC-CABLE-GRND Kit: Designed specifically for armored fiber cables, providing reliable grounding hardware .

Installation Considerations

• Armored fiber cables are often preferred over conduit installations because they reduce installation costs by up to 40% and installation time by up to 50% .
• Always follow manufacturer instructions and local codes to ensure proper grounding and network safety .
• For environments with high mechanical stress, rodents, or congested pathways, armored cables provide added protection and reliability . Properly grounding armored fiber optic cables is essential for network safety, equipment protection, and compliance with industry standards, and using dedicated grounding kits simplifies the process while ensuring reliable performance.