Non-Metallic vs Metallic Armored Fiber Optic Cable

Choosing between metallic vs non-metallic fiber cable protection requires more than comparing steel with aramid or glass yarn. Both constructions can protect optical fibers against mechanical stress, but they behave very differently in terms of conductivity, weight, flexibility, grounding, corrosion, rodent resistance and suitability near electrical infrastructure.

Metallic armored fiber optic cable typically uses corrugated steel tape, steel wire armour or another metallic protective layer. These constructions can provide very strong crush, impact and rodent protection, particularly in underground, industrial and infrastructure routes.

By contrast, non-metallic armored fiber optic cable uses dielectric reinforcing materials such as aramid yarn, glass yarn or FRP. As a result, the cable can remain electrically non-conductive while still gaining additional tensile and mechanical strength.

Therefore, neither armour family is universally better. The correct choice depends on the actual mechanical risk, electrical environment, installation method, rodent exposure, route geometry and project standards.

Quick answer: Choose metallic armour when strong crush, impact and rodent protection are the main priorities and conductive steel components are acceptable. Choose non-metallic armour when the project requires mechanical reinforcement without introducing conductive metal, especially near substations, power infrastructure or other electrically sensitive environments. In either case, water blocking, sheath material, fiber type, loose-tube architecture and direct-burial suitability should be specified separately.

Metallic vs Non-Metallic Fiber at a Glance

Characteristic	Metallic Armored Fiber	Non-Metallic Armored Fiber
Typical armour material	Corrugated steel tape, steel wire armour or other metal	Aramid yarn, glass yarn, FRP or dielectric reinforcement
Electrical conductivity	Conductive metallic layer present	Can remain all-dielectric
Crush protection	Generally very strong	Depends strongly on reinforcement design
Rodent protection	Strong physical barrier	Can provide good resistance depending on material and coverage
Tensile reinforcement	Strong with SWA-type designs	Can be very strong with aramid systems
Weight	Generally higher	Generally lower
Flexibility	Often lower	Often higher
Grounding considerations	May apply	No metallic armour grounding requirement
Corrosion risk	Metallic layer must remain protected	No steel armour corrosion
High-voltage environment	Requires electrical-system review	Often attractive because it can remain dielectric
Typical selection logic	Maximum physical protection	Mechanical strength + electrical isolation

The table shows the general distinction. However, actual performance comes from the complete cable design rather than the armour material alone.

What Is Metallic Armored Fiber Optic Cable?

A metallic armored fiber optic cable incorporates a metal layer around the optical cable core to provide additional mechanical protection.

Common metallic protection systems include:

• Corrugated steel tape
• Galvanized steel tape
• Steel Wire Armour
• Steel Wire Braid
• Other project-specific metallic reinforcement

Depending on the product, manufacturers place the metallic layer over a cable core, bedding or inner sheath and then apply an outer protective jacket.

Consequently, a typical metallic armored fiber cable can include:

• Optical fibers
• Central or multiple loose tubes
• Gel or dry water blocking
• FRP central strength member
• Additional strength yarns
• Inner sheath where required
• Metallic armour
• PE, HDPE or LSZH outer sheath

What Is Non-Metallic Armored Fiber Optic Cable?

A non-metallic armored fiber optic cable uses dielectric materials to reinforce and protect the cable without introducing a metallic armour layer.

Common reinforcing materials include:

• Aramid yarn
• Glass yarn
• FRP
• GRP
• Other dielectric rods or reinforcing elements

These materials can provide tensile strength, crush resistance, rodent resistance or a combination of these properties depending on the cable architecture.

Importantly, non-metallic armour does not mean the cable lacks protection.

Instead, the manufacturer creates that protection using dielectric materials rather than steel.

Non-Metallic Armored Does Not Mean Unarmored

This is one of the most important distinctions in the article.

An unarmored fiber optic cable may still contain normal strength members needed for cable stability. However, it does not include an additional armour or reinforced protective system intended to increase resistance against demanding external mechanical hazards.

A non-metallic armored cable, meanwhile, adds significant dielectric reinforcement around the fiber cable core.

Therefore:

Unarmored fiber = no dedicated armour layer.

Non-metallic armored fiber = dedicated mechanical reinforcement without metallic armour.

These terms should not be used interchangeably.

What Is the Main Difference Between Metallic and Non-Metallic Armour?

The central difference is electrical conductivity.

Metallic armour introduces a conductive steel or metallic layer into the cable.

Non-metallic armour can maintain a completely dielectric cable architecture.

As a result, the two constructions can solve the same mechanical problem in different ways.

For example, both may provide:

• Tensile reinforcement
• Crush protection
• Impact resistance
• Rodent protection
• Long-term mechanical stability

However, their weight, flexibility, grounding requirements and behaviour near electrical systems can differ considerably.

Corrugated Steel Tape as Metallic Armour

Corrugated steel tape is one of the most common metallic protection systems used in outdoor fiber optic cable.

The manufacturer forms a steel tape into a corrugated profile around the cable core before applying the final outer sheath.

This design can provide effective protection against:

• Crushing
• Impact
• Rodent attack
• Soil pressure
• Localized mechanical damage

At the same time, steel tape can remain relatively compact compared with heavier steel-wire constructions.

Therefore, it is particularly useful where the project needs substantial physical protection but wants to control cable diameter and weight.

Steel Wire Armour as Metallic Protection

Steel Wire Armour, or SWA, uses galvanized steel wires around the cable construction.

Compared with corrugated steel tape, SWA can provide stronger tensile reinforcement in addition to heavy mechanical protection.

For this reason, SWA can suit routes involving:

• High installation tension
• Severe mechanical exposure
• Heavy industrial environments
• Demanding direct burial
• Strong rodent risk
• Long or difficult pulling sections

However, SWA also increases cable diameter, weight and stiffness.

Consequently, it should solve a defined mechanical requirement rather than serve as an automatic upgrade.

Aramid Yarn as Non-Metallic Reinforcement

Aramid yarn provides high tensile strength at relatively low weight.

Manufacturers can apply aramid reinforcement around a fiber cable core to carry longitudinal loads without introducing conductive steel.

Therefore, aramid-based designs can be especially attractive for:

• All-dielectric fiber cables
• ADSS constructions
• Power infrastructure
• Aerial routes
• Industrial networks
• Applications where weight must remain low

Aramid yarn can also contribute to mechanical protection, although the exact crush and rodent performance depends on the amount, arrangement and complete cable design.

Glass Yarn as Non-Metallic Armour

Glass yarn provides another dielectric reinforcement option.

Depending on the cable design, glass yarn can contribute to:

• Mechanical reinforcement
• Crush resistance
• Rodent resistance
• Tensile performance
• All-dielectric construction

In particular, glass-based reinforcement can create a physical and irritating barrier that discourages rodent attack.

However, engineers should still review the actual cable test data instead of assuming every glass-yarn construction provides identical rodent protection.

FRP in Non-Metallic Fiber Optic Cable

Fiber Reinforced Plastic, or FRP, frequently serves as a dielectric structural member inside optical cables.

In multi loose tube designs, manufacturers commonly place FRP at the center and strand the loose tubes around it.

FRP helps control:

• Cable geometry
• Tensile loading
• Compression
• Longitudinal stability

Meanwhile, the material remains electrically non-conductive.

However, a central FRP rod alone does not automatically make a cable “non-metallic armored.”

The complete construction must include the required additional mechanical reinforcement for the intended armour function.

Which Provides Better Crush Protection?

Metallic armour generally provides a strong advantage where severe crushing or localized impact represents the main risk.

Corrugated steel tape creates a hard barrier around the cable core, while SWA provides a substantial steel-wire structure.

Therefore, metallic armour often becomes the easier engineering choice for:

• Rocky soil
• Roadside infrastructure
• Heavy industrial routes
• Direct burial
• Tunnels
• Areas with construction activity

Nevertheless, non-metallic designs can also achieve significant crush performance.

The correct comparison should use actual mechanical test values rather than the material name alone.

Which Provides Better Rodent Protection?

Metallic armour creates a strong physical barrier that rodents have difficulty penetrating.

Corrugated steel tape and steel wire therefore remain popular where rodent activity represents a serious network risk.

However, non-metallic protection can also provide effective resistance.

For example, glass yarn can create an unpleasant and mechanically difficult barrier, while dense dielectric reinforcement can protect the internal cable structure.

Therefore, the selection should follow:

• Rodent severity
• Route conditions
• Required electrical isolation
• Specified test performance
• Project experience

Which Provides Better Tensile Strength?

Both metallic and non-metallic constructions can provide high tensile performance.

SWA offers particularly strong tensile reinforcement because the steel wires carry substantial longitudinal load.

Meanwhile, aramid yarn provides an excellent strength-to-weight ratio and is widely used in demanding self-supporting and reinforced optical cables.

Consequently, tensile strength should not be reduced to a simple “steel is stronger” rule.

Instead, engineers should compare:

• Maximum installation tension
• Maximum operating tension
• Fiber strain
• Cable elongation
• Long-term load limits

Weight: Metallic vs Non-Metallic Fiber Cable

Non-metallic cable usually provides a weight advantage.

Steel armour adds substantial mass to the cable, especially in large SWA constructions.

Higher weight can affect:

• Drum weight
• Transport
• Manual handling
• Pulling forces
• Aerial loading
• Support requirements

By contrast, aramid, glass yarn and FRP can provide useful mechanical strength with significantly lower material density.

Therefore, non-metallic construction can be attractive for long routes where installation weight matters.

Cable Diameter and Duct Capacity

Metallic armour can also increase outside diameter.

SWA typically needs bedding or an inner sheath, the steel-wire layer and an outer protective jacket.

Meanwhile, corrugated steel tape can create a more compact metallic solution.

Non-metallic reinforcement can often maintain a relatively compact design, although this depends on the amount of yarn or dielectric protection required.

Consequently, buyers should compare actual cable dimensions before selecting a construction for a congested duct.

Which Fiber Cable Is More Flexible?

Non-metallic reinforced designs are generally lighter and can provide greater installation flexibility than heavy metallic armored cables.

However, flexibility depends on:

• Cable diameter
• Armour type
• Number of jackets
• Loose-tube architecture
• Strength-member arrangement
• Outer-sheath material

For example, corrugated steel tape may remain more flexible than a heavy SWA construction.

Therefore, metallic versus non-metallic alone does not determine the minimum bending radius.

Grounding and Bonding Considerations

Metallic armour introduces a conductive element along the cable route.

Depending on local regulations, equipment and system design, this can create bonding or grounding requirements.

Therefore, projects using metallic armored fiber should review:

• Armour continuity
• Building entry
• Grounding philosophy
• Potential differences between locations
• Utility requirements
• Local electrical codes

By contrast, an all-dielectric non-metallic cable avoids metallic-armour grounding requirements.

This can simplify installation near electrically sensitive infrastructure.

Metallic vs Non-Metallic Fiber Near High-Voltage Systems

Non-metallic construction is particularly attractive near electrical infrastructure because it does not create a conductive metallic path through the cable.

Potential applications include:

• Substations
• Power plants
• Transmission corridors
• Rail electrification
• High-voltage industrial areas

In these environments, engineers can use FRP, aramid and glass reinforcement to maintain a dielectric architecture.

However, the absence of metal does not eliminate every electrical or environmental design consideration.

For example, aerial ADSS routes near high-voltage conductors can still require evaluation of electric-field effects on the outer jacket.

Does Fiber Optic Cable Suffer from EMI?

The optical fibers themselves transmit light and are inherently immune to electromagnetic interference.

Therefore, metallic armour does not improve the optical fiber’s EMI immunity.

However, metallic cable components can interact with the electrical environment because they conduct electricity.

Consequently, the advantage of an all-dielectric cable is not “better optical shielding.”

Instead, the main benefit is removing conductive metallic components from the cable structure.

Lightning: Metallic vs Non-Metallic Fiber Cable

Non-metallic fiber cable does not provide a continuous metallic path for lightning current along the cable.

This can be valuable in exposed electrical and utility environments.

However, it is more accurate to describe an all-dielectric cable as non-conductive rather than universally “lightning proof.”

Nearby equipment, poles, closures and extreme electrical events can still affect the complete network.

Therefore, cable construction forms only one part of the overall electrical protection strategy.

Corrosion Resistance

Non-metallic armour has another practical advantage: the armour itself cannot rust.

Metallic steel protection normally remains enclosed beneath an outer sheath. As long as that sheath stays intact, the steel remains isolated from the surrounding environment.

However, severe sheath damage can expose metallic components to moisture or aggressive chemicals.

Consequently, corrosion resistance can become relevant in:

• Coastal environments
• Chemical plants
• Marine infrastructure
• Wet tunnels
• Industrial soil conditions

A dielectric reinforcement system avoids steel-armour corrosion altogether.

Water Blocking Is Separate from Armour Type

Neither metallic nor non-metallic armour automatically makes a fiber cable waterproof.

Water blocking requires separate cable elements such as:

• Thixotropic gel
• Water-swellable yarn
• Water-swellable tape
• Dry blocking compounds
• Sealed tube systems

Therefore, buyers should specify moisture performance independently from armour material.

A metallic armored cable can have poor water protection if the internal design is inadequate. Likewise, a non-metallic cable can provide excellent water blocking when the loose-tube and core systems are correctly engineered.

Metallic vs Non-Metallic Fiber for Direct Burial

Direct burial represents one of the most important applications for comparing armour systems.

Metallic protection can be particularly useful where the buried route faces:

• Severe rodent risk
• Crushing
• Rocky soil
• Construction activity
• Heavy mechanical exposure

Corrugated steel tape can provide a compact protection system, while SWA can provide heavier mechanical and tensile reinforcement.

However, non-metallic direct-burial constructions can also be appropriate when their mechanical test values meet the required route conditions.

Therefore, direct burial does not automatically require metallic armour.

Metallic vs Non-Metallic Fiber for Duct Installation

A protective duct already reduces many external mechanical risks.

Consequently, non-metallic reinforced cable can be especially attractive where engineers want:

• Lower weight
• Smaller outside diameter
• Greater flexibility
• No metallic grounding requirement

However, a damaged or rodent-prone duct route may still justify metallic armour.

For this reason, the duct condition should influence cable selection rather than the underground location alone.

Metallic vs Non-Metallic Fiber for Aerial Networks

Aerial fiber networks can use both metallic and non-metallic constructions.

Messenger-wired cables can incorporate steel support elements, while ADSS uses dielectric tensile reinforcement to support itself without a metallic messenger.

Therefore, non-metallic construction is particularly important for:

• Power-line corridors
• Substation routes
• All-dielectric aerial systems
• Long-span ADSS networks

However, a cable containing aramid yarn does not automatically qualify as ADSS.

The complete cable must be designed to support the required aerial span.

Metallic vs Non-Metallic Fiber for Railway Infrastructure

Railways can present both mechanical and electrical challenges.

Trackside cables may encounter:

• Vibration
• Rodents
• Ballast and soil pressure
• Electrification systems
• Outdoor weather
• Mechanical maintenance activity

Therefore, both armour families can have valid roles.

A heavily exposed underground route may favour steel armour, while a route near electrified infrastructure can favour an all-dielectric construction if it provides adequate mechanical performance.

Metallic vs Non-Metallic Fiber for Industrial Networks

Industrial facilities can create demanding mechanical conditions, but they can also contain significant electrical infrastructure.

Metallic armored fiber can be attractive for:

• Refineries
• Heavy manufacturing
• Mining
• Road crossings
• Mechanically exposed underground routes

By contrast, non-metallic reinforced fiber can be attractive around:

• Transformers
• Switchyards
• Substations
• High-voltage equipment
• Electrified railway systems

Consequently, one industrial project can legitimately use both cable families in different parts of the same site.

Metallic vs Non-Metallic Fiber for Oil and Gas Projects

Oil and gas networks can require mechanical strength, long-distance transmission and environmental resistance.

For exposed underground routes, metallic armour can provide a strong physical barrier against mechanical damage.

However, electrically sensitive or specialized sections can benefit from dielectric reinforcement.

In addition, project engineers should separately define:

• Oil resistance
• Chemical resistance
• UV resistance
• Fire performance
• Water blocking
• Temperature range

Therefore, armour type alone does not define an oil and gas fiber cable.

Metallic vs Non-Metallic Fiber for Data Centers and Campuses

Campus and data-center networks often place fiber inside ducts or protected pathways between buildings.

In these routes, an all-dielectric reinforced construction can provide a lightweight and installation-friendly solution.

However, specific routes may require additional steel protection because of:

• Rodents
• Shared utility trenches
• Road crossings
• Industrial construction

Therefore, network planners should segment the route by risk instead of automatically selecting one armour type for the entire campus.

Does Metallic Armour Make Fiber Faster?

No.

Armour does not determine optical bandwidth.

Fiber transmission depends on factors such as:

• Fiber type
• Wavelength
• Attenuation
• Dispersion
• Splice quality
• Connector loss
• Network equipment

Therefore, a G.652.D fiber inside a metallic armored cable and the same G.652.D fiber inside a non-metallic cable can provide equivalent optical transmission performance when both products meet the relevant optical specifications.

Single-Mode and Multimode Options

Both armour families can use different optical fiber standards.

Single-mode options commonly include:

• G.652.D
• G.657.A1
• G.657.A2

Meanwhile, multimode options can include:

• OM1
• OM2
• OM3
• OM4
• OM5

Therefore, the optical fiber standard should follow the network requirement rather than the armour material.

Central Loose Tube vs Multi Loose Tube Armour Options

Both metallic and non-metallic protection can be combined with central loose tube and multi loose tube cable architectures.

A central loose tube design can provide:

• Compact diameter
• Simple internal structure
• Efficient moderate fiber counts

Meanwhile, multi loose tube construction can provide:

• Higher fiber counts
• Scalable backbone capacity
• Tube-level fiber organization

Therefore, armour and tube architecture should remain separate specification decisions.

Metallic Armour with Central Loose Tube

A central loose tube can combine effectively with corrugated steel tape.

For example, a typical construction can include:

• Optical fibers
• Gel-filled central loose tube
• Dielectric strength elements
• Corrugated steel tape
• PE outer sheath

This architecture can provide compact dimensions while adding strong crush and rodent protection.

Metallic Armour with Multi Loose Tube

High-count fiber networks can also combine multi loose tube architecture with metallic armour.

A typical design may include:

• Several PBT loose tubes
• Central FRP member
• Water blocking
• Glass yarn
• Inner PE sheath
• Corrugated steel tape
• Outer PE or HDPE sheath

As a result, the cable can combine high fiber capacity with substantial underground mechanical protection.

Non-Metallic Armour with Central Loose Tube

Central loose tube cables can also use glass or aramid reinforcement without metallic armour.

This architecture can provide a compact dielectric cable for:

• Duct networks
• Industrial links
• Power environments
• Campus networks
• Outdoor distribution

Therefore, buyers should not associate central loose tube exclusively with either armour family.

Non-Metallic Armour with Multi Loose Tube

Multi loose tube designs can use FRP and aramid or glass reinforcement to create high-capacity all-dielectric cables.

Such constructions are particularly useful for:

• Telecom backbones
• Aerial ADSS
• High-voltage environments
• Utility communications
• Long-distance dielectric routes

Consequently, high fiber count does not require metallic reinforcement.

PE, HDPE and LSZH Sheaths

The outer sheath should also be selected independently from the armour system.

PE and HDPE are commonly used for outdoor and underground environments because suitable compounds provide good moisture, abrasion and weather resistance.

Meanwhile, LSZH materials become important where the route enters occupied buildings or where project fire requirements demand low-smoke halogen-free performance.

Therefore:

Metallic does not mean PE.

Non-metallic does not automatically mean LSZH.

The complete cable specification must define the jacket separately.

Does Armour Type Determine Fire Performance?

No.

Metallic or non-metallic armour describes mechanical construction.

Fire performance depends on separate cable materials and testing.

A project can require characteristics such as:

• Flame retardancy
• LSZH performance
• CPR classification
• Fire resistance
• Circuit integrity

Therefore, steel armour does not automatically make a fiber cable fire resistant, and an all-dielectric cable does not automatically provide low-smoke performance.

Metallic vs Non-Metallic Fiber: Cost Considerations

Price depends on much more than armour material.

Factors include:

• Fiber count
• Fiber type
• Cable diameter
• Steel quantity
• Aramid or glass content
• Number of jackets
• Water blocking
• Fire performance
• Order quantity

Metallic designs can carry additional steel cost, weight and transport cost.

However, high-performance dielectric reinforcement can also represent a significant material cost.

Therefore, the lowest purchase price should not determine the armour strategy by itself.

Total Installation Cost

The total installed cost can differ from the cable purchase price.

A heavier metallic cable can increase:

• Drum handling
• Transport
• Pulling effort
• Gland or termination complexity
• Grounding work

Meanwhile, a lighter dielectric cable can reduce some of these installation burdens.

However, insufficient mechanical protection can create far greater repair costs later.

Consequently, the optimal cable is the lightest and simplest construction that still provides sufficient long-term protection.

Which Armour Type Should You Choose?

Project Condition	Construction to Consider	Reason
Severe crush exposure	Metallic armour	Strong physical barrier
Extreme rodent risk	Metallic armour often preferred	Steel provides robust physical protection
High tensile requirement	SWA or engineered aramid design	Both can provide substantial tensile strength
High-voltage environment	Non-metallic armour	Maintains dielectric construction
Low weight required	Non-metallic armour	Lower-density reinforcement
Grounding should be avoided	Non-metallic armour	No metallic armour layer
Rocky direct burial	Metallic armour	Strong impact and crush protection
Protected duct	Non-metallic may be sufficient	Duct already provides external protection
Corrosive environment	Evaluate non-metallic first	Eliminates steel-armour corrosion
ADSS aerial route	Non-metallic	All-dielectric self-supporting architecture

The table provides general selection logic rather than a substitute for product-specific mechanical data.

Common Mistakes When Comparing Metallic and Non-Metallic Fiber Cable

1. Assuming Non-Metallic Means Unprotected

Dielectric armour can provide substantial mechanical reinforcement without steel.

2. Assuming Metallic Armour Is Always Stronger

Steel provides excellent mechanical protection, but properly engineered aramid systems can achieve very high tensile performance.

3. Assuming Every Direct-Burial Cable Needs Steel

Direct burial requires adequate mechanical protection, not one mandatory material.

4. Assuming Non-Metallic Armour Automatically Means ADSS

ADSS requires a complete self-supporting aerial design, not merely aramid reinforcement.

5. Assuming Steel Armour Improves Optical Bandwidth

Armour protects the cable mechanically but does not change the intrinsic bandwidth of the optical fiber.

6. Ignoring Grounding Requirements

Metallic armour can introduce bonding and grounding considerations.

7. Assuming Fiber Needs Metallic Armour for EMI Protection

The optical fiber itself already transmits without susceptibility to electromagnetic interference.

8. Calling All-Dielectric Cable Lightning Proof

All-dielectric means the cable does not contain a conductive armour path. It does not guarantee that the entire network can never experience lightning-related effects.

9. Ignoring Corrosion

Damaged outer sheaths can expose metallic components to aggressive environments.

10. Assuming Armour Provides Water Blocking

Water-blocking materials and armour perform separate functions.

11. Choosing Armour Without Checking Cable Diameter

Extra protection can reduce available duct capacity and increase bending radius.

12. Comparing Materials Instead of Test Values

Crush, impact, tensile and bending data provide a more reliable engineering comparison than armour names alone.

13. Ignoring Rodent Severity

Different routes can require very different levels of physical protection.

14. Assuming Non-Metallic Always Costs Less

High-performance aramid and specialized dielectric systems can also carry substantial material cost.

15. Using One Armour Type Across an Entire Project

Different sections of the same network can justify different mechanical constructions.

What Should Buyers Include in an Armored Fiber RFQ?

A request that states only “armored fiber optic cable” leaves the most important design choice unresolved.

A useful RFQ should define:

• Fiber count
• Fiber type
• G.652.D, G.657.A1, G.657.A2 or multimode requirement
• Central or multi loose tube construction where relevant
• Installation method
• Duct, direct burial or aerial route
• Mechanical risk
• Rodent exposure
• Required crush resistance
• Required impact resistance
• Maximum installation tension
• Maximum operating tension
• Metallic or non-metallic preference
• Corrugated steel tape where specified
• SWA where specified
• Aramid or glass reinforcement where required
• All-dielectric requirement
• Grounding restrictions
• Electrical environment
• Water-blocking requirement
• Gel or dry construction preference
• Outer sheath material
• PE, HDPE or LSZH requirement
• UV resistance
• Chemical resistance where required
• Fire-performance requirement
• Minimum bending radius
• Maximum outside diameter
• Operating temperature
• Applicable IEC or project standards
• Cable marking
• Drum length
• Mechanical test reports
• Optical test documentation

As a result, the manufacturer can choose an armour system that matches the actual route rather than simply quoting the strongest or heaviest construction available.

ETK Kablo Metallic and Non-Metallic Armored Fiber Solutions

ETK Kablo manufactures both metallic and non-metallic armored fiber optic cables for telecommunications, industrial, utility, transportation, FTTX, campus and infrastructure networks.

Within the metallic armored portfolio, ETK Kablo offers constructions using corrugated steel tape and steel wire armour for routes requiring strong mechanical, crush and rodent protection.

A-D(ZN)(SR)2Y is one example of a compact metallic armored central loose tube construction. It combines a gel-filled loose tube, dielectric strength elements, corrugated steel tape and a PE outer sheath for demanding outdoor and underground routes.

For higher fiber counts, ETK Kablo also manufactures multi loose tube metallic designs that combine FRP central strength members, water-blocking systems, inner jackets and corrugated steel tape armour.

Meanwhile, the non-metallic armored portfolio includes central and multi loose tube designs using glass yarn, aramid yarn and FRP reinforcement. These constructions can provide mechanical strength while maintaining an all-dielectric cable architecture.

Non-metallic designs are particularly relevant where electrical isolation, reduced weight or the avoidance of metallic armour grounding is important.

Both armour families can use single-mode G.652.D, G.657.A1 and G.657.A2 fibers as well as multimode OM1, OM2, OM3, OM4 and OM5 options according to the project specification.

Therefore, the appropriate ETK cable should be selected by combining mechanical risk, electrical environment, installation method, fiber capacity, water exposure and long-term network requirements.

Frequently Asked Questions

What is the difference between metallic and non-metallic armored fiber optic cable?

Metallic armored fiber uses steel or another conductive metal for additional mechanical protection. Non-metallic armored fiber uses dielectric reinforcement such as aramid yarn, glass yarn or FRP, allowing the cable to remain electrically non-conductive.

Is non-metallic armored fiber actually armored?

Yes. Non-metallic armored fiber uses dedicated mechanical reinforcement even though the armour does not contain steel. It should not be confused with a basic unarmored cable.

Which is stronger, metallic or non-metallic fiber cable?

The answer depends on the mechanical parameter. Metallic armour generally provides excellent crush and impact protection, while engineered aramid systems can provide very high tensile strength. Actual test values should determine the comparison.

Which fiber cable is better for rodents?

Metallic armour such as corrugated steel tape or SWA provides a very strong physical rodent barrier. Non-metallic glass-yarn constructions can also provide rodent resistance depending on their design.

Which cable is better near high-voltage power systems?

All-dielectric non-metallic cable is often attractive because it does not create a conductive metallic path. However, the complete mechanical and environmental requirements must still be satisfied.

Does metallic fiber cable need grounding?

Metallic armour can introduce grounding or bonding requirements depending on local regulations, system design and installation environment.

Does non-metallic fiber cable need grounding?

A completely dielectric cable does not require grounding for a metallic armour layer because no such layer exists. Other equipment in the network can still have separate grounding requirements.

Is non-metallic fiber cable immune to EMI?

Optical fibers inherently transmit without susceptibility to electromagnetic interference. Non-metallic construction additionally removes conductive metal from the cable structure.

Is non-metallic fiber cable lightning proof?

It is more accurate to say that an all-dielectric cable does not provide a metallic current path. The complete network can still experience indirect lightning-related effects through equipment or infrastructure.

Can non-metallic armored fiber be directly buried?

Yes, when the complete cable construction provides the required crush, tensile, rodent, moisture and environmental performance for the route.

Can metallic armored fiber be installed in ducts?

Yes. Metallic armour can be used in ducts where additional mechanical or rodent protection is required. However, the additional weight and diameter may be unnecessary in well-protected pathways.

What is corrugated steel tape fiber cable?

It is an armored fiber optic cable that uses a corrugated steel tape layer around the cable core to provide compact mechanical, crush and rodent protection.

What is SWA fiber optic cable?

SWA fiber optic cable uses galvanized steel wires as armour. It provides strong mechanical and tensile reinforcement for demanding routes.

What materials are used in non-metallic fiber armour?

Common materials include aramid yarn, glass yarn, FRP and other dielectric reinforcing elements.

Is ADSS a non-metallic armored cable?

ADSS is an all-dielectric self-supporting fiber cable that uses dielectric strength members such as aramid yarn. However, not every non-metallic armored cable is ADSS because ADSS must also support its own aerial span.

Which cable is lighter?

Non-metallic reinforced fiber cable is generally lighter because aramid, glass and FRP have lower density than steel armour.

Which cable is more flexible?

Non-metallic construction is often more flexible than heavy SWA designs. However, actual bending performance depends on the complete cable architecture.

Which cable is better for direct burial?

Metallic armour is often preferred for severe crush, impact and rodent exposure. Non-metallic construction can also work where its mechanical performance meets the route requirements and electrical isolation is important.

Can both cable types use G.652.D and G.657.A2 fibers?

Yes. Armour material and optical fiber standard are separate design choices. Both metallic and non-metallic constructions can use G.652.D, G.657.A1, G.657.A2 and suitable multimode fibers.

Which standards apply to armored fiber optic cable?

The IEC 60794 family provides mechanical, environmental and optical requirements and test methods for fiber optic cables. The exact product and installation standard should match the intended application.

Conclusion

The choice between metallic vs non-metallic fiber protection is fundamentally a balance between mechanical protection and electrical isolation.

Metallic armour such as corrugated steel tape and SWA provides a strong physical barrier against crushing, impact, rodents and demanding underground conditions. Therefore, it remains an excellent option where maximum mechanical protection is the main priority.

Non-metallic armour uses materials such as aramid yarn, glass yarn and FRP to provide mechanical reinforcement without introducing conductive steel. As a result, these cables can remain lighter, more flexible and fully dielectric.

However, neither family should be selected based on one advantage alone.

Mechanical test values, electrical environment, grounding requirements, corrosion risk, installation method, fiber count, water blocking and sheath material all influence the final decision.

Armour should also remain separate from optical performance. G.652.D, G.657.A1, G.657.A2 and multimode fibers can operate inside either armour system, while the protective construction simply helps preserve reliable optical operation under the expected environmental conditions.

For engineers and purchasing teams, the most effective approach is therefore to define the mechanical hazards first, identify whether conductive metallic components are acceptable second, and then select the lightest and simplest armour system that provides the required long-term protection.