WDZ-KYJRP Low Smoke Zero Halogen Shielded Control Cable for Automation, Instrument & Fire Linkage Signal Transmission Systems

Interpretation of Technical Specifications for Electrical and Automation Engineers

WDZ: Low Smoke Zero Halogen (LSZH); features halogen-free insulation and sheathing; emits minimal, non-toxic smoke during combustion and produces no corrosive, halogen-containing gases.

K: Control cable; specifically designed for low-current signal transmission, PLC control, instrumentation interlocking, and fire safety linkage circuits.

YJ: XLPE (cross-linked polyethylene) core insulation; offers high heat resistance and a low dielectric constant, ensuring stable signal transmission performance.

R: Multi-strand flexible conductor; highly flexible, making it suitable for cabinet wiring, applications involving frequent bending, and internal equipment wiring.

P: Overall copper tape wrap shield; isolates external electromagnetic interference, thereby eliminating signal distortion and data loss.

WDZ-KYJRP is a Class B flame-retardant, low-smoke zero-halogen (LSZH), flexible control cable featuring an overall shield. It is specifically designed for the transmission of low-voltage analog and digital signals in public buildings with stringent fire safety requirements and in general industrial automation workshops. Unlike unshielded WDZ-KYJY cables, this model utilizes an overall copper tape shield that effectively mitigates signal distortion caused by electromagnetic interference from variable frequency drives (VFDs), high-current power cables, and electrical equipment. Its LSZH, flame-retardant construction complies with mandatory fire safety standards for applications such as fire alarm systems, smoke exhaust linkage systems, and automated control systems in public buildings. This product fills the market gap between standard PVC-insulated shielded control cables and high-end fire-resistant shielded control cables, striking an optimal balance among interference resistance, fire safety, and overall project material costs.

Seven-layer integrated internal structure (from inner conductor outwards)

• Class 5 fine-stranded flexible oxygen-free copper conductor: Composed of tightly stranded fine filaments meeting Class 5 flexibility standards, facilitating bending and routing within compact PLC cabinets and control boxes.
• Irradiation-crosslinked XLPE single-core insulation: Uniformly extruded with a thin wall and low dielectric loss, ensuring stable transmission of low-current analog signals.
• Halogen-free, low-smoke elastic filler layer: Fills the gaps between insulated cores to form a circular cable profile, reducing internal signal crosstalk between multiple control cores.
• Polyester binding/separation tape: Wraps the entire assembly of insulated cores to secure their position and prevent friction-induced damage to the insulation during pulling.
• Full-coverage copper tape shield: Utilizes an overlapping copper tape wrap with 100% coverage, effectively blocking electromagnetic interference from nearby power cables and motors.
• LSZH (Low-Smoke Zero-Halogen) inner separation sheath: Isolates the copper tape shield from the outer flame-retardant sheath, preventing corrosion of the metal shield and abrasion damage to the internal insulation.
• WDZ Class B flame-retardant LSZH outer sheath: Made of eco-friendly polyolefin composite material; features flame retardancy, low smoke emission, and zero-halogen properties, as well as moisture and mold resistance, making it suitable for installation in enclosed cabinets and tunnels.

Applicable Domestic and International Standards

Domestic mandatory/relevant standards:

• GB/T 9330 (Control Cables)
• GB/T 19666 (General Specification for Low-Smoke Zero-Halogen Cables)
• GB 31247 (Classification of Low-Smoke Zero-Halogen Flame-Retardant Performance)
• GB 50116 (Code for Design of Automatic Fire Alarm Systems)
• GB 50217 (Code for Design of Power Engineering Cables)

International reference test standards:

• IEC 60228 (Flexible Conductors)
• IEC 60332-3B (Vertical Flame Spread Test for Bunched Cables)
• IEC 61034 (Smoke Density Test)
• IEC 60754 (Halogen Emission Test)
• EMC (Electromagnetic Shielding Attenuation Test)

Product positioning and comparison with similar control cables

2. Comprehensive Electrical and Flame-Retardant Technical Specifications

2.1 Rated Voltage Standard

Standard specification: 450/750V. This is the unified standard for various domestic automation instruments and fire control signal circuits; no custom voltage specifications are required for standard projects.

2.2 Core Count and Conductor Cross-Sectional Area Specifications

• Conductor cross-sectional area: 1.0mm² / 1.5mm² / 2.5mm² (mainstream specifications for control signal transmission; 0.75mm² also available for miniature instrument wiring).
• Core count options: 2 / 3 / 4 / 5 / 7 / 8 / 10 / 12 / 14 / 16 / 19 / 24 / 30 / 37 cores, covering requirements ranging from single-device interlocking to wiring for multiple centralized control cabinets.
• Conductor standard: 99.99% virgin T2 oxygen-free fine copper wire; Class 5 flexible stranded structure; low DC resistance ensures stable, attenuation-free transmission of low-voltage signals.

2.3 Key Electrical, Shielding, and Fire Safety Technical Specifications

• Long-term permissible operating temperature: 90°C (heat resistance superior to PVC-insulated control cables); suitable for continuous operation within enclosed, high-temperature PLC control cabinets.
• Short-circuit withstand temperature: Withstands 250°C for up to 5 seconds without melting or dielectric breakdown of the insulation layer.
• Category B bunched-cable flame retardancy: Complies with the IEC 60332-3B vertical bunched-cable combustion test; prevents flame propagation along bunched control cables in cable trays and vertical shafts.
• Low-smoke (Category B) standard: Smoke light transmittance ≥60% during combustion, ensuring visibility for fire rescue operations and equipment evacuation.
• Halogen-free specification: Total halogen emission <0.5%; produces no corrosive hydrogen chloride gas, preventing damage to fire alarm systems and precision PLC electronic components.
• Copper tape shielding attenuation: Shielding effectiveness ≥40 dB within the 0.1–30 MHz frequency range, effectively suppressing interference generated by variable frequency drives (VFDs), contactors, and high-current power cables.
• Minimum installation bending radius: 12 times the cable's outer diameter; features a flexible, stranded-core structure that facilitates repeated, tight-radius bending during installation within compact control cabinets.
• Installation temperature range: -20°C to +70°C; allows for normal wiring operations in cold winter conditions without the need for pre-heating.
• Factory withstand voltage test: Every insulated core undergoes a 2 kV AC withstand voltage test (5-minute duration) prior to shipment, with no insulation breakdown; 100% batch pass rate for shield continuity testing.
• Mold and moisture resistance: Utilizes a sealed, dual-layer Low Smoke Zero Halogen (LSZH) sheath structure, making it suitable for installation in environments subject to prolonged dampness, such as underground utility tunnels and basement control rooms.

2.4 Application Guide Based on Core Count

• Low core count (2–8 cores): Linking individual fire detectors, signal transmission for single instruments, and wiring for small local PLC cabinets.
• Medium core count (10–19 cores): Fire alarm system trunk lines for building floors and interlocking control circuits for individual pieces of workshop equipment.
• High core count (24–37 cores): Main signal cables for fire control rooms and integrated wiring for multiple instrument groups in factory central control cabinets.

3. Core Technical Advantages (Targeted at Automation and Fire Protection Engineers)

3.1 Full-coverage copper tape overall shielding to eliminate signal distortion and crosstalk

Compared to unshielded WDZ-KYJY cables, the key advantage of the WDZ-KYJRP cable lies in its full-coverage, overlapping copper tape shield. In installation environments where power and signal cables are laid together, or in industrial workshops equipped with large variable-frequency drive (VFD) systems, this shielding effectively absorbs external electromagnetic radiation. This prevents issues such as analog signal drift, digital signal packet loss, and fluctuations in instrument data. For fire alarm linkage systems, stable signal transmission ensures the timely activation of smoke exhaust fans, fire dampers, and fire pumps, preventing control failures caused by interference.

3.3 Low-Smoke Zero-Halogen (LSZH) Flame-Retardant Properties Prevent Secondary Damage During Building Fires

All insulation, filler, and sheath materials are free from halogenated PVC. In the event of a fire in a control room, cable shaft, or equipment basement, only minimal, non-toxic smoke is produced; this prevents smoke from obscuring the visibility of firefighting and rescue teams and protects expensive equipment—such as PLCs, host systems, and instrumentation—from damage caused by corrosive gases. Compliance with this standard is a mandatory acceptance requirement for automatic fire control systems in hospitals, shopping malls, underground utility tunnels, and various large-scale public buildings.

3.4 XLPE thin-wall insulation reduces the cable's outer diameter, making it suitable for installation in high-density cable tray systems.

Utilizing a standardized thin-wall extrusion process for the XLPE insulation layer, the WDZ-KYJRP cable achieves a smaller overall outer diameter compared to PVC-insulated, shielded control cables of the same core count and cross-sectional area while maintaining equivalent insulation performance. This allows for a higher cable density within limited spaces—such as cable trays and electrical shafts—effectively resolving congestion issues associated with routing multiple trunk lines for fire alarm linkage and automation signals in large, complex buildings.

3.5 Broad environmental adaptability reduces the need for additional protective conduit.

Featuring a Low-Smoke Zero-Halogen (LSZH) outer sheath, the cable offers excellent resistance to UV radiation, moisture, and corrosion from mild acids and alkalis. Combined with a tightly shielded inner sheath, it can be installed directly in indoor cable trays, basement control rooms, semi-open equipment trenches, and municipal utility tunnel racks without the need for heavy-duty anti-corrosive steel conduit, thereby lowering auxiliary material procurement costs for large-scale automation and fire control projects.

3.6 Consistent Batch Performance: Compliance with shielding and flame-retardant standards eliminates risks associated with acceptance inspections and required rectifications.

Utilizing production lines featuring automatic copper tape wrapping, XLPE co-extrusion, and LSZH (Low-Smoke Zero-Halogen) formulation processing, we strictly control parameters such as shielding coverage, smoke density, and flame-retardant performance. Performance variations across production batches are kept within extremely tight industry tolerances, effectively eliminating the risk of failing fire safety acceptance inspections or EMC (Electromagnetic Compatibility) spot checks due to inconsistent cable quality.

4. Classification of Industrial and Civil Application Scenarios + 3 Typical Project Case Studies

4.1 Mandatory Application Areas

• Building automatic fire alarm and linkage control systems

  Signal transmission for fire detectors, control circuits for smoke exhaust fans, linkage wiring for fire dampers, signal cables for fire pump local control cabinets, and linkage trunk lines for evacuation equipment

• Industrial plant automation and PLC centralized control circuits

  Signal wiring for variable-frequency drive (VFD) equipment in workshops, sensor data transmission for assembly lines, and multi-group linkage control cables for PLC centralized control cabinets in production workshops

• Instrumentation Layout for Municipal Underground Infrastructure

  Signal cables for gas leak monitoring in urban utility tunnels; control lines for tunnel ventilation equipment; fire linkage signal trunk lines for underground pedestrian passages

• Precision Equipment Control in High-Occupancy Public Buildings

  Interlock signal lines for medical equipment in Class-A hospital wards; automatic control circuits for HVAC systems in large shopping malls; main fire alarm signal lines for airport terminals; fire monitoring lines for school academic buildings

• Centralized Signal Distribution in Commercial Complex Control Rooms

  Group control systems for office building HVAC; automatic exhaust control for underground parking garages; instrument signal transmission for property management monitoring systems

4.2 Proven Real-World Engineering Applications

• Case Study 1: Fire Protection System for a New Inpatient Building at a Grade-A Tertiary General Hospital

  The project’s fire safety design specified the use of WDZ-KYJRP shielded control cables for fire detectors in patient rooms, local control cabinets for basement fire pumps, and smoke exhaust linkage circuits in public areas. Standard unshielded WDZ-KYJY cables were rejected due to their inability to withstand severe signal interference generated by high-frequency medical equipment, while PVC-sheathed shielded KYJVP cables failed to meet fire department standards for "Low-Smoke Zero-Halogen" (LSZH) properties. Our company provided comprehensive EMC test reports (confirming copper tape shielding performance) and Class B LSZH flame-retardant certification, facilitating the project's successful passing of the fire safety inspection without the need for remedial work. The cable's flexible design significantly improved wiring efficiency within the numerous distributed patient room control boxes; after a full year of system operation at maximum load, no signal drift or equipment malfunctions occurred.

• Case Study 2: PLC Automation Infrastructure for an Intelligent Automotive Parts Workshop (Phase I)

  The system integrator selected the WDZ-KYJRP series of multi-core shielded control cables for use with assembly line sensors, variable frequency drive (VFD) interlocks, and signal backbones connecting to the central control cabinet. The cables' high-efficiency 40dB copper tape shielding effectively isolated electromagnetic interference generated by dozens of large motors and VFDs within the workshop, resolving persistent data fluctuation issues associated with the previous PVC-shielded cable solution. We provided customized, cut-to-length services based on the wiring schematics for each production line, reducing cable waste by 14% and optimizing the electrical material budget for the entire automation project.

• Case Study 3: Monitoring and Fire Protection Interlock System Project for the Phase I Utility Tunnel in the Eastern District of a Certain City

  The tender documents for this municipal project explicitly required that control cables used for gas monitoring and tunnel fire protection interlock circuits possess low-smoke, zero-halogen (LSZH) properties and electromagnetic interference (EMI) resistance. Design engineers confirmed that the WDZ-KYJRP cable model was the only specification meeting these requirements. Our automation technical experts assisted the procurement team in compiling CCC certification, shielding attenuation test data, and IEC LSZH flame-retardant test reports. This ensured that all parameters fully aligned with the detailed technical specifications in the tender documents, thereby significantly boosting the contractor's comprehensive evaluation score. Upon project completion, on-site spot checks conducted by a third party regarding EMC (electromagnetic compatibility) and flame-retardant performance confirmed that all indicators successfully met acceptance standards.

5. Selection Logic and Checklist for Cabinet/Cable Trench Installation Standards

5.1 Technical Specification Matching Rules for Automation and Fire Protection Engineers

• Voltage Rating Selection Rules: Standard 450/750V WDZ-KYJRP cables are to be used uniformly for all indoor fire alarm and industrial automation signal circuits; no other voltage specifications are required.
• Conductor Cross-Section Matching Logic: 1.0mm² or 1.5mm² specifications are selected for signal circuits of standard fire detectors and small sensors; 2.5mm² specifications are used for long-distance utility tunnel trunk lines and control circuits for high-power actuators, with a 10% signal transmission margin reserved to account for signal attenuation.
• Core Count Matching Standards: 2–8 core WDZ-KYJRP cables are selected for single-equipment interlocking; 10–19 core cables are used for floor-level fire alarm trunk lines and centralized control within a single workshop; high-core-count cables (24–37 cores) are selected for integrated multi-equipment wiring in central control rooms.
• Application Matching and Exclusion Notes: WDZ-KYJRP is the optimal choice for general-purpose, interference-resistant fire protection and automation signal circuits; emergency power-cut control circuits for critical fire pumps must be upgraded to NH-KYJRP fire-resistant, shielded control cables; for lines permanently installed in workshops handling highly corrosive chemicals, fully enclosed metal conduits must be installed over the cables to provide isolation and protection.

5.2 Key Control Checklist for On-site Installation

• Spacing requirements for mixed installation: A safety clearance of 30 cm must be maintained between WDZ-KYJRP signal control cables and high-current power cables; in tiered cable tray layouts, metal dividers should be installed to minimize cross-interference.
• Cabinet wiring specifications: Utilize the cable's flexible core and small bending radius for neat routing; secure wire bundles with plastic cable ties, ensuring the LSZH (Low Smoke Zero Halogen) outer sheath and copper tape shielding layer are not scratched by sharp metal edges within the cabinet.
• Installation in shafts and tunnels: Install mounting brackets at 1.5-meter intervals; for bundled multi-core control cables, maintain a 20% heat dissipation gap to prevent temperature rises from compromising the stability of insulation and shielding performance.
• Shielding layer grounding: Both ends of the copper tape shielding layer must be reliably connected to the grounding busbar within the cabinet; single-end grounding would reduce shielding attenuation performance, thereby weakening interference resistance.
• Low-temperature installation: The LSZH outer sheath retains good flexibility at -20°C; therefore, no pre-heating is required when routing or bending the cables during municipal or industrial facility projects in cold northern winters.

5.3 Key Points for Procurement and Goods Acceptance (for Procurement Personnel)

• Pre-order Qualification Review: Verify that the supplier can provide CCC mandatory certification, EMC attenuation test reports for the copper tape shielding, and a Class B LSZH (Low-Smoke Zero-Halogen) compliance certificate.
• Goods Acceptance and Spot Checks: Verify the clear laser-printed markings on the outer sheath (e.g., "WDZ-KYJRP 450/750V + number of cores × cross-sectional area"); inspect the copper tape overlap rate, the uniformity of the stranded flexible copper cores, and the consistency of the XLPE insulation thickness. For tender projects involving government hospitals, utility tunnels, and factory automation, samples must be taken for third-party spot checks regarding EMC shielding performance and flame retardancy.
• Delivery Schedule Planning: For bulk orders destined for large hospitals, smart factories, and municipal utility tunnels, orders should be placed 9 to 14 working days in advance. This lead time accounts for raw material stranding, copper tape shielding wrapping, and finished product spot checks, thereby preventing installation delays in automation systems caused by cable supply shortages.

6. Comprehensive Fire Safety and EMC Compliance System

• Compliance with domestic standards: The entire WDZ-KYJRP control cable series fully complies with the GB/T 9330 standard for control cables and the GB 31247 mandatory fire safety specifications for Low-Smoke Zero-Halogen (LSZH) materials; all performance metrics meet the acceptance criteria set by engineering quality supervision stations and fire rescue bureaus.
• Internationally recognized testing capabilities: The products have passed the full suite of IEC testing standards covering mechanical properties, fire safety, and electromagnetic compatibility (EMC) for control cables; official test reports are available for tender submissions regarding overseas factory automation and public building fire safety projects.
• Comprehensive documentation package provided with delivery: Includes CCC certification, EMC test reports (copper tape shielding attenuation), test reports for Category B bunched-cable flame retardancy and smoke/halogen emissions, factory batch inspection reports, quality certificates for T2 copper and LSZH flame-retardant raw materials, technical parameter compliance tables for tenders, and special VAT invoices.
• Guaranteed batch-to-batch consistency: Each production batch utilizes standardized fine copper wire stranding, uniform copper tape wrapping overlap rates, and stable LSZH flame-retardant formulations. This ensures minimal batch-to-batch variation in shielding and fire safety performance, effectively eliminating the risk of project acceptance failure caused by substandard shielding control cables in specific batches.

7. Advantages of Exclusive Direct Sourcing and One-Stop Technical Support

7.1 WDZ-KYJRP: Comprehensive Stock Availability and Customization Support

• We offer a full range of specifications, spanning from 2-core 1.0mm² micro-sensor cables to 37-core 2.5mm² large-scale centralized control backbone cables. Ample stock is maintained for standard fire alarm and factory automation cables to ensure rapid delivery. We also provide customization services—such as precision length cutting, laser printing of project-specific identifiers on outer sheaths, and marking for single-end shield grounding—enabling one-stop, centralized procurement of Low-Smoke Zero-Halogen (LSZH) shielded control cables without the need to coordinate with multiple suppliers.

7.2 Five-Tier Rigorous Quality Control System for Control Cable Raw Materials and Finished Products

• We exclusively utilize high-quality imported low-smoke, zero-halogen (LSZH) flame-retardant masterbatches, prime-grade T2 high-purity oxygen-free copper, and highly ductile conductive copper tapes; we strictly prohibit the use of inferior recycled halogen-free plastics, thin non-conductive copper tapes, or impure copper wires that fail to meet shielding and flame-retardancy standards. We implement a comprehensive five-tier inspection and control process: testing incoming raw materials for halogen content and conductivity; in-line monitoring of fine copper wire stranding; automatic thickness detection during XLPE insulation extrusion; real-time control of copper tape shielding overlap rates; and batch sampling of finished cables for EMC shielding and flame-retardant performance. This approach effectively eliminates quality defects common among smaller manufacturers—such as incomplete copper tape coverage, excessive smoke emission, and brittleness or cracking of LSZH sheathing.

7.3 Factory-direct supply eliminates intermediary markups, reducing the total cost of automation projects.

• By bypassing distributor markups, we offer tiered volume discounts for bulk orders of WDZ-KYJRP cables destined for large hospitals, smart factories, and municipal utility tunnels. Our senior automation and electrical engineers provide complimentary optimization services—including matching signal circuit cross-sections with core counts and designing cable tray isolation layouts for mixed power and signal routing. This assists purchasers in selecting the most cost-effective WDZ-KYJRP specifications while fully meeting anti-interference and fire safety standards, thereby lowering the overall investment in automation and fire-safety electrical materials for the project.

7.4 Specialized Pre-sales Technical Consulting Team for Fire Protection and Automation

• We maintain a team of electrical engineers with over 12 years of experience in fire alarm and industrial automation design. Dedicated to providing comprehensive technical support to design institutes and system integrators, our services encompass: consulting on fire linkage and PLC signal circuit design; provision of downloadable shielding attenuation parameter tables for WDZ-KYJRP cables; compilation of EMC and fire safety compliance documentation for the tendering phase; and guidance on preparing materials for official fire safety inspections and acceptance. For projects such as government hospitals and utility tunnels, we assist in compiling comparative tables regarding shielding performance and LSZH (Low Smoke Zero Halogen) fire-safety specifications that meet rigorous tender requirements, thereby significantly enhancing the competitiveness of contractors in the bidding process.

7.5 Automated Integrated Production Lines for Shielded Control Cables Ensure Stable, On-Time Delivery

• Multiple production lines—integrating XLPE continuous co-extrusion and automated copper tape wrapping processes—enable high daily output of WDZ-KYJRP cables. Supported by large-scale raw material warehouses stocked with ample supplies of high-purity copper, conductive copper tape, and Low-Smoke Zero-Halogen (LSZH) plastics, the facility can meet large-volume orders for smart factories and hospital fire safety systems strictly according to schedule, thereby eliminating the risk of installation delays for automated equipment caused by supply shortages of shielded control cables.

7.6 Long-term, Full-lifecycle After-sales Technical Support for Shielded Control Cables

• All delivered WDZ-KYJRP low-smoke, zero-halogen (LSZH) shielded control cables come with a 15-year manufacturer's quality warranty, covering key performance indicators such as electromagnetic compatibility (EMC)—ensured by copper tape shielding—and LSZH fire safety standards. A professional technical team provides remote video guidance within 24 hours to address technical challenges encountered during installation, such as cabinet wiring and shield grounding; for long-term partners—including system integrators and municipal engineering firms—on-site training on fire control cabinet wiring and shield grounding procedures can be arranged. Dedicated profiles are established for steady, high-volume clients, and raw materials are stockpiled in advance based on project automation schedules to shorten delivery times for subsequent orders.

8. A specialized overview for automation designers, system integrators, and bulk project purchasers

The WDZ-KYJRP low-smoke, zero-halogen (LSZH), flexible-core, copper-tape-shielded control cable is a signal transmission solution specifically designed for building fire linkage systems, industrial PLC automation equipment, municipal utility tunnel monitoring instruments, and precision control circuits in high-occupancy public buildings. This product combines three core advantages: superior electromagnetic interference (EMI) resistance provided by full-coverage copper tape shielding; Class 5 flexible conductors that facilitate wiring within cabinets; and LSZH flame-retardant properties that meet Class B standards. It effectively resolves two critical design challenges in signal control engineering: equipment malfunctions caused by electromagnetic interference and secondary hazards resulting from toxic smoke during building fires.

As a specialized manufacturer of WDZ-KYJRP shielded control cables—holding domestic CCC certification as well as international qualifications for IEC EMC and fire safety testing—we offer a comprehensive range of standardized Low-Smoke Zero-Halogen (LSZH) shielded control cables, complete documentation packages for acceptance and certification, and expert technical consulting for automation and fire safety electrical systems. We serve global fire system integrators, smart factory contractors, municipal utility tunnel design institutes, and procurement teams for large-scale signal control projects. We help signal transmission projects requiring medium-to-high fire safety ratings successfully pass EMC shielding spot checks and fire safety inspections, ensuring that automatic control signal circuits operate with long-term stability, interference resistance, and minimal maintenance throughout the entire lifecycle of the buildings and equipment.