Unscreened Signal Control Cable for Automation and Industrial Systems

Unscreened Signal Control Cable provides flexible copper connectivity for signal transmission, control circuits, automation systems, instrumentation equipment and electronic devices where the installation does not require a metallic electromagnetic screen. ETK Kablo manufactures this PVC signal-control family in LIYY and LIYY-TP/TT constructions using stranded Class 5 copper conductors, PVC insulation and PVC outer jackets.

The current range contains two distinct architectures. Standard LIYY uses individually insulated conductors stranded together in layers, while LIYY-TP/TT organizes the conductors into twisted pairs or triads before assembling the complete cable. Neither construction uses an overall foil, copper braid or individual metallic pair screen.

This unscreened architecture can suit control panels, sensors, measurement circuits, building automation and industrial equipment where electromagnetic interference remains within acceptable project limits. Where a route requires additional EMC protection, ETK Kablo provides separate foil-screened, braid-screened and combined-screen signal-control cable categories.

What Is an Unscreened Signal Control Cable?

An unscreened signal control cable transmits electrical signals or control information without a metallic electromagnetic screen around the cable core.

The current ETK Kablo PVC family uses flexible stranded copper conductors, PVC core insulation and a PVC outer jacket. Pair twisting or core stranding organizes the electrical circuits, while the absence of foil and braid keeps the cable construction comparatively simple.

Unscreened cable can be appropriate when the electromagnetic environment does not justify a dedicated metallic screen.

ETK Kablo Unscreened PVC Signal Control Cable Range

Product	Internal Arrangement	Metallic Screen	Jacket
LIYY Signal Control Cable	Individual cores stranded in layers	None	PVC
LIYY-TP/TT Signal Control Cable	Cores arranged into twisted pairs or triads	None	PVC

Both products belong to the same unscreened PVC family, but their internal circuit organization differs. Standard LIYY addresses multicore applications, while LIYY-TP/TT provides pair or triad geometry for applications that require grouped conductors.

What Does LIYY Mean?

LIYY is a widely used designation for flexible PVC signal and control cable.

In practical project terminology, LIYY identifies an unscreened cable with flexible stranded copper conductors, PVC insulation and a PVC outer sheath.

The absence of the screening designation distinguishes LIYY from products such as LIYCY, which use a metallic braid, or LIY(St)Y, which use an overall foil.

LIYY Cable Construction

Component	Current ETK Kablo LIYY Construction
Conductor	Stranded electrolytic copper, Class 5
Conductor Standard	IEC 60228 / EN 60228 / DIN VDE 0295
Insulation	PVC
Core Identification	DIN 47100
Stranding	In layers
Wrapping	Polyester tape
Metallic Screen	None
Outer Jacket	UV-resistant PVC, RAL 7035 grey

LIYY-TP/TT Cable Construction

LIYY-TP/TT uses the same basic conductor, insulation and PVC jacket concept but changes the internal stranding architecture.

Component	Current ETK Kablo LIYY-TP/TT Construction
Conductor	Stranded electrolytic copper, Class 5
Insulation	PVC
Pair / Triad Formation	Insulated conductors stranded into pairs or triads
Overall Stranding	Pairs or triads stranded together
Wrapping	Polyester tape
Metallic Screen	None
Outer Jacket	UV-resistant PVC, RAL 7035 grey

LIYY vs LIYY-TP/TT

Feature	LIYY	LIYY-TP/TT
Basic Material System	PVC insulation + PVC jacket	PVC insulation + PVC jacket
Conductor	Class 5 stranded copper	Class 5 stranded copper
Internal Arrangement	Cores stranded in layers	Pairs or triads
Overall Metallic Screen	No	No
Individual Screen	No	No
Primary Selection Factor	General multicore signal/control circuits	Grouped pair or triad circuits

The correct construction should follow the circuit architecture defined by the project. TP and TT describe conductor grouping; they do not indicate electromagnetic screening.

What Do TP and TT Mean?

In this signal-control cable family, TP refers to twisted-pair organization and TT refers to twisted-triad organization.

A pair groups two insulated conductors, while a triad groups three. ETK Kablo then strands the resulting pairs or triads together to form the complete cable core.

Pair or triad construction can help maintain the intended relationship between conductors belonging to the same signal or control circuit.

However, twisting should not be confused with metallic shielding. LIYY-TP/TT remains an unscreened cable because no foil or conductive braid surrounds the pairs, triads or overall core.

Class 5 Stranded Copper Conductors

ETK Kablo uses IEC 60228 Class 5 stranded electrolytic copper conductors in the current LIYY and LIYY-TP/TT products.

Class 5 construction provides greater flexibility than a comparable solid conductor. As a result, installers can route the cable more easily through control panels, equipment enclosures and fixed industrial pathways.

Flexible conductor construction should not automatically be interpreted as continuous-flex or drag-chain qualification. Applications involving repeated movement require a cable specifically designed and documented for that duty.

PVC Insulation and PVC Outer Jacket

The current LIYY family uses PVC both for conductor insulation and for the outer jacket.

The published construction references TS IEC 60189-2 and EN 50290-2-21 for the PVC insulation and uses DIN 47100 identification.

ETK Kablo publishes a UV-resistant PVC outer jacket in RAL 7035 grey for both current products.

PVC provides a familiar material system for industrial signal and control wiring. However, projects requiring low-smoke, halogen-free cable should evaluate the separate LSZH signal-control family rather than treating standard LIYY as halogen-free.

DIN 47100 Core Identification

DIN 47100 color identification helps installers distinguish individual cores within multicore signal cables.

Clear core identification can simplify panel wiring, commissioning, maintenance and fault tracing in automation systems.

The exact core configuration should still follow the project wiring diagram and selected product construction.

When Should an Unscreened Signal Cable Be Used?

An unscreened signal-control cable can be appropriate when the installation environment has limited electromagnetic interference and the project specification does not require a dedicated metallic screen.

Potential applications include:

• Control cabinets
• PLC input and output circuits
• Sensor connections
• Actuator control circuits
• Measurement equipment
• Electronic devices
• HVAC control systems
• Building management systems
• Machine control wiring
• Process monitoring circuits

The actual circuit voltage, signal type, route and electromagnetic environment should determine the final cable selection.

Unscreened Cable and Electromagnetic Interference

LIYY does not contain a foil or conductive braid that specifically addresses external electromagnetic interference.

Therefore, route planning becomes particularly important where signal cables run near motors, drives, switching equipment, power cables or other potential noise sources.

Where the electromagnetic environment requires a dedicated screen, project engineers should select an appropriate screened signal-control construction rather than relying on an unscreened cable.

Unscreened vs Foil-Screened Signal Control Cable

Feature	Unscreened LIYY	Foil-Screened Cable
Overall Foil	No	Yes
Overall Copper Braid	No	No, unless combined screen is specified
Main Selection Driver	Low-EMI route	Requirement for overall foil screening
Mechanical Armor	No	No, unless separately specified

An overall foil adds an electromagnetic-screening layer without creating mechanical armor.

Unscreened vs Braid-Screened Signal Control Cable

Feature	Unscreened LIYY	Braid-Screened LIYCY-Type Cable
Metallic Screen	None	Tinned copper braid
Core Architecture	PVC-insulated flexible copper	PVC-insulated flexible copper
EMC Screening	No dedicated metallic screen	Overall conductive braid
Main Selection Factor	EMI does not require screening	Project requires braid screening

The screened construction should follow the actual electromagnetic requirement rather than a general assumption that a screened cable is always preferable.

Unscreened vs Foil-and-Braid Screened Cable

A foil-and-braid screened signal-control cable combines two metallic screening elements around the signal core.

Standard LIYY contains neither layer.

Projects that specify combined screening should therefore use the dedicated braided-foil-screened category instead of standard LIYY.

Unscreened Cable vs Steel Wire Armored Cable

Electromagnetic screening and mechanical armor are separate engineering requirements.

Standard LIYY has neither a metallic screen nor steel armor.

Steel Wire Armored signal-control cables add a mechanical steel layer around the cable construction. Depending on the exact product, they can also contain a separate electromagnetic screen.

A cable should therefore not be described as screened merely because it contains steel mechanical protection.

Unscreened Cable vs Steel Wire Braided Cable

Steel Wire Braid provides mechanical reinforcement around a cable. This function differs from a tinned copper braid used for electromagnetic screening.

Standard LIYY contains no steel braid and no electromagnetic copper braid.

Projects that require mechanical protection should evaluate the dedicated SWB or SWA signal-control families separately.

LIYY vs LIYCY

Feature	LIYY	LIYCY
Insulation	PVC	PVC
Outer Jacket	PVC	PVC
Overall Screen	None	Tinned copper braid
Main Use	Signal/control routes where screening is not required	Signal/control routes requiring braid screening

LIYY vs LIY(St)Y

Feature	LIYY	LIY(St)Y
Overall Metallic Screen	None	Foil
Insulation System	PVC	PVC-based family according to exact product
Main Selection Driver	Unscreened signal/control	Overall foil-screened signal/control

LIYY vs LIHH

LIYY and LIHH can both provide unscreened signal-control functionality, but they belong to different material families.

LIYY uses PVC insulation and a PVC outer jacket.

LIHH belongs to ETK Kablo's halogen-free signal-control portfolio. Projects that require low-smoke and halogen-free material behavior should therefore evaluate the LSZH unscreened category rather than standard LIYY.

LIYY vs YSLY Control Cable

LIYY and YSLY belong to different ETK Kablo product families.

LIYY belongs to the Signal Control Cable family and is commonly associated with low-voltage signal, measurement, electronics and automation circuits.

YSLY belongs to the dedicated Control Cable family and is associated with conventional multicore machine and industrial control applications.

LIYY for PLC and Automation Systems

Programmable logic controllers connect to sensors, relays, switches and other field devices through numerous signal and control circuits.

LIYY can provide flexible multicore wiring where the route does not require a metallic screen.

The selected conductor cross-section, core count and operating voltage should match the actual input, output or control circuit.

LIYY for Sensors and Measurement Circuits

Sensors and measuring devices often require low-current connections between field equipment and control electronics.

Unscreened LIYY can serve these circuits where the electromagnetic environment permits an unscreened solution.

For noise-sensitive analog measurements or routes near strong interference sources, project engineers should evaluate a screened alternative.

LIYY for HVAC and Building Automation

HVAC and BMS installations contain control circuits for dampers, valves, sensors, thermostats, controllers and monitoring equipment.

LIYY can provide multicore signal and control wiring for suitable low-EMI routes.

The required conductor count and cross-section should follow the actual system architecture rather than a generic building-automation assumption.

LIYY for Control Panels

The Class 5 stranded conductor construction supports practical routing within control cabinets and equipment enclosures.

DIN 47100 core identification also assists circuit identification during panel assembly and maintenance.

Where the cable exits the panel and enters an electrically noisy route, designers should review whether an unscreened construction remains appropriate.

LIYY-TP for Twisted-Pair Circuits

LIYY-TP groups conductors into twisted pairs before the pairs are stranded together.

The current ETK Kablo product documentation lists pair configurations from 1 pair to 10 pairs across several conductor cross-sections.

This architecture can suit circuits where two conductors belong to the same electrical signal or control loop and the project specifically requires pair organization.

LIYY-TP remains electrically unscreened despite its twisted-pair construction.

LIYY-TT for Twisted-Triad Circuits

LIYY-TT organizes conductors into groups of three according to the product construction.

Triad architecture can be relevant where three conductors belong to the same circuit or measurement arrangement.

The product construction supports pairs or triads. Exact TT sizes and triad counts should be confirmed during quotation.

Current LIYY Conductor Cross-Sections

The current LIYY type table covers a particularly broad range of conductor cross-sections.

Published configurations include:

• 0.14 mm²
• 0.22 mm²
• 0.25 mm²
• 0.34 mm²
• 0.50 mm²
• 0.75 mm²
• 1.00 mm²
• 1.50 mm²
• 2.50 mm²
• 4.00 mm²
• 6.00 mm²
• 10.00 mm²
• 16.00 mm²

Available conductor counts vary by cross-section. Higher cross-sections generally use fewer conductors, while smaller sizes are available in substantially larger multicore configurations.

Current LIYY-TP/TT Cross-Sections

The currently published LIYY-TP/TT type table lists pair-based constructions at:

• 0.50 mm²
• 0.75 mm²
• 1.00 mm²
• 1.50 mm²
• 2.50 mm²

The table lists configurations from 1 pair through 10 pairs for the smaller listed sizes, while exact availability changes with cross-section.

Projects requiring TT triads should confirm the exact production combination during quotation.

Electrical Characteristics Depend on Conductor Size

Operating voltage, insulation resistance and capacitance vary according to the selected LIYY conductor size.

The current electrical table separates smaller signal sizes from larger cross-sections.

Cross-Section	Conductor Resistance at 20°C	Insulation Resistance	Mutual Capacitance	Published Operating Voltage	Test Voltage
0.22 mm²	85.0 Ω/km	200 MΩ/km	110 nF/km	250 V	1200 V
0.25 mm²	77.8 Ω/km	200 MΩ/km	110 nF/km	250 V	1200 V
0.34 mm²	56.0 Ω/km	200 MΩ/km	110 nF/km	250 V	1200 V
0.50 mm²	39.0 Ω/km	20 MΩ/km	120 nF/km	300/500 V	2000 V
0.75 mm²	26.0 Ω/km	20 MΩ/km	120 nF/km	300/500 V	2000 V
1.00 mm²	19.5 Ω/km	20 MΩ/km	130 nF/km	300/500 V	2000 V
1.50 mm²	13.3 Ω/km	20 MΩ/km	140 nF/km	300/500 V	2000 V
2.50 mm²	7.98 Ω/km	20 MΩ/km	150 nF/km	300/500 V	2000 V

The exact electrical values should therefore follow the selected conductor cross-section rather than a blanket specification applied to the entire unscreened category.

Flame-Retardancy Standard

The current LIYY and LIYY-TP/TT product documentation references IEC 60332-1-2 flame-retardancy testing, together with corresponding VDE and BS EN references.

This test addresses flame propagation on the cable construction.

PVC flame retardancy should not be confused with LSZH material behavior or fire-resistant circuit integrity. LIYY is not an FE180 or PH-rated fire-resistant cable.

Operating Temperature and Bending Radius

The current ETK Kablo LIYY and LIYY-TP/TT product documentation specifies an operating temperature range of -30°C to +70°C.

The product documentation also specifies a minimum bending radius of 7.5xD.

These values describe the current product data for the standard constructions. Project engineers should still review installation conditions, ambient temperature and cable routing during final selection.

LIYY Is Flexible but Not Automatically a Drag-Chain Cable

Class 5 stranded conductors provide flexibility for installation and routing.

That does not automatically mean the cable suits continuous repetitive flexing in drag chains, robotics or permanently moving machine assemblies.

Dynamic applications should use a construction specifically qualified for the required bending cycles, acceleration and mechanical movement.

Indoor and Protected Industrial Installation

LIYY can be used for control cabinets, equipment wiring and fixed signal/control installations where the project requirements are compatible with the cable construction.

The PVC outer jacket provides mechanical protection around the cable core, but standard LIYY should not automatically be described as armored, direct-burial, water-blocked or chemically resistant to every industrial substance.

Installation claims should follow the exact environmental specification of the project.

Unscreened PVC vs Unscreened LSZH Signal Cable

Feature	PVC Unscreened	LSZH Unscreened
Typical ETK Family	LIYY	LIHH family
Metallic Screen	None	None
Material Direction	PVC insulation / jacket	Halogen-free construction
Main Selection Driver	Standard PVC signal/control requirement	Low-smoke / halogen-free requirement

How to Specify Unscreened Signal Control Cable

A complete RFQ should identify the electrical circuit, conductor configuration and installation environment rather than requesting only “unscreened control cable.”

Specification Item	Information to Provide
Cable Family	LIYY or LIYY-TP/TT
Screening	Unscreened
Conductor	Class 5 stranded electrolytic copper
Insulation	PVC
Outer Jacket	PVC
Cross-Section	Specify required mm²
Core / Pair / Triad Count	Specify circuit configuration
Operating Voltage	Confirm against selected cross-section
EMI Environment	Confirm that no metallic screen is required
Installation	Define fixed route, panel or equipment environment
Fire Requirement	Specify flame, CPR or halogen-free requirement where applicable
Packing	Confirm required coil or drum length
Documentation	Datasheet, DoP where applicable and project documentation

Why Choose ETK Kablo for Unscreened Signal Control Cable?

ETK Kablo manufactures unscreened PVC signal-control cables in both standard multicore LIYY and pair/triad LIYY-TP/TT constructions.

The current products use IEC 60228 Class 5 stranded copper conductors, PVC insulation, polyester wrapping and PVC outer jackets for industrial automation, panel wiring, measurement and control applications.

The broad LIYY size range supports different conductor counts and cross-sections, while LIYY-TP/TT provides grouped pair or triad architectures for circuits that require this internal organization.

ETK Kablo can evaluate conductor cross-section, core or pair count, voltage requirement, electromagnetic environment, packing and documentation during quotation.

Frequently Asked Questions About Unscreened Signal Control Cable

What is an unscreened signal control cable?

An unscreened signal control cable carries signal or control circuits without an overall foil, copper braid or other dedicated electromagnetic screen.

What is LIYY cable?

LIYY is a flexible unscreened signal and control cable with stranded copper conductors, PVC insulation and a PVC outer jacket.

Does LIYY have shielding?

No. Standard LIYY does not use an overall metallic foil or braid.

What is LIYY-TP?

LIYY-TP uses conductors organized into twisted pairs. The complete cable remains unscreened.

What is LIYY-TT?

LIYY-TT uses conductors organized into twisted triads. The product construction remains unscreened unless another screening designation is specified.

What is the difference between LIYY and LIYCY?

LIYY is unscreened. LIYCY adds an overall tinned copper braid for electromagnetic screening.

What is the difference between LIYY and LIY(St)Y?

LIYY has no metallic screen. LIY(St)Y uses an overall foil-screened construction.

Is LIYY a PVC cable?

Yes. The current ETK Kablo LIYY construction uses PVC insulation and a PVC outer jacket.

What conductor class does ETK Kablo LIYY use?

The current LIYY and LIYY-TP/TT products use IEC 60228 Class 5 stranded electrolytic copper conductors.

What cross-sections are available for LIYY?

The current LIYY type table includes configurations from 0.14 mm² up to 16 mm², with conductor counts depending on cross-section.

What cross-sections are listed for LIYY-TP/TT?

The current type table lists pair-based configurations from 0.50 mm² through 2.50 mm². Exact twisted-triad availability should be confirmed during quotation.

What temperature range does LIYY use?

The current ETK Kablo product documentation specifies an operating range of -30°C to +70°C.

What is the minimum bending radius?

The current LIYY and LIYY-TP/TT product documentation specifies a minimum bending radius of 7.5xD.

Is LIYY flame retardant?

The current ETK Kablo product documentation references IEC 60332-1-2 flame-retardancy testing. This does not make LIYY a fire-resistant circuit-integrity cable.

Is LIYY halogen-free?

No. LIYY uses PVC insulation and a PVC outer jacket. Projects requiring halogen-free material should evaluate the LSZH unscreened signal-control range.

Can LIYY be used near motors or frequency drives?

LIYY has no dedicated metallic EMC screen. Routes with significant electromagnetic interference should be evaluated for a screened cable construction.

Is LIYY suitable for drag chains?

Class 5 conductors provide installation flexibility, but standard LIYY should not automatically be treated as a continuous-flex or drag-chain cable unless the exact product documentation specifies that duty.

What information should I provide when requesting a quotation?

Provide the LIYY or LIYY-TP/TT requirement, conductor cross-section, core/pair/triad count, voltage requirement, installation environment, EMI conditions, quantity, packing requirement and required documentation.