WDZ-KYJYRP Low Smoke Zero Halogen Pair Twisted Individual Shielded Control Cable

• WDZ: Low-Smoke Zero-Halogen (LSZH) type; insulation, fillers, and outer sheath utilize halogen-free polyolefin composite materials, ensuring no toxic or corrosive halogen gases are released during open-flame combustion.
• K: Control cable; designed specifically for the transmission of low-voltage analog signals, digital differential signals, instrumentation signals, and fire alarm linkage control signals.
• YJ: XLPE (cross-linked polyethylene) single-core insulation; features extremely low dielectric loss, ensuring stable signal transmission even amidst continuous temperature fluctuations.
• Y: Integrated LSZH inner sheath enclosing all twisted-pair units.
• R: Class 5 flexible stranded copper conductor; suitable for installations requiring repeated bending within compact DCS cabinets and instrument enclosures.
• P: Dual-layer shielding structure featuring individual copper tape shielding for each twisted pair plus an overall copper tape shield.

The WDZ-KYJYRP is a Class B flame-retardant, Low-Smoke Zero-Halogen (LSZH), flexible control cable featuring dual-layer shielding and twisted pairs; it is specifically engineered for high-precision differential signal transmission applications requiring minimal crosstalk and robust electromagnetic interference (EMI) immunity. Unlike the WDZ-KYJRP model—which utilizes only an overall shield—this cable incorporates an individual copper tape shield for each twisted signal pair, creating a "pair-specific isolation plus overall shielding" architecture that fundamentally eliminates crosstalk between internal signal circuits. Its fully LSZH, flame-retardant construction meets mandatory fire safety standards for petrochemical plants, DCS central control rooms, hospital precision monitoring systems, and underground tunnel fire detection circuits. It fills the market gap between standard single-shielded control cables and high-end, fire-resistant, dual-shielded signal cables, striking an ideal balance among superior signal stability, fire safety performance, and overall project budget control.

1. Class T2 ultra-fine stranded flexible oxygen-free copper conductor: Class 5 tight stranding; features low DC resistance and excellent flexibility, making it ideal for high-density cabinet cabling and applications involving frequent bending.
2. Irradiation-crosslinked XLPE single-core insulation: Uniform thin-wall extrusion with stable dielectric constant; prevents signal phase shift during long-distance transmission.
3. Twisted-pair unit: Two insulated single-core wires tightly twisted at a fixed pitch; suppresses external common-mode interference affecting differential signals.
4. Individual copper tape shielding for each twisted-pair unit: 100% overlapping copper tape wrap; isolates crosstalk between adjacent signal pairs.
5. Halogen-free, low-smoke flexible filler: Fills gaps between shielded twisted-pair units to form a uniform circular profile; reduces internal heat accumulation during high-density cable tray installation.
6. Polyester binding/separation tape: Wraps all shielded twisted-pair units to secure their positions and prevent abrasion or scratching during pulling and routing.
7. LSZH (Low-Smoke Zero-Halogen) separation inner sheath: Isolates internal shielded twisted-pair units from the outermost overall shield; prevents short circuits between metal shielding layers.
8. Full-coverage overall copper tape shield: Blocks strong external electromagnetic radiation from high-current power cables, variable frequency drives (VFDs), large motors, etc.
9. WDZ Class B flame-retardant LSZH outer sheath: Eco-friendly, flame-retardant polyolefin composite material; offers moisture, mold, and UV resistance; suitable for long-term installation in environments such as enclosed indoor cabinets, basements, semi-open equipment trenches, and municipal utility tunnels.

Mandatory domestic standards:

• GB/T 9330 (General Specification for Control Cables)
• GB/T 19666 (General Technical Requirements for Low-Smoke, Halogen-Free, Flame-Retardant, and Fire-Resistant Cables)
• GB 31247 (Classification for Burning Behavior of Cables and Optical Cables)
• GB 50116 (Code for Design of Automatic Fire Alarm Systems)
• GB/T 50770 (Code for Design of DCS Engineering)

Corresponding international testing standards:

• IEC 60228 (Conductors of Insulated Cables)
• IEC 60332-3B (Test for Vertical Flame Spread of Vertically-Mounted Bunched Wires or Cables)
• IEC 61034 (Measurement of Smoke Density)
• IEC 60754 (Test on Halogen Acid Gas Evolution)
• EMC Differential Signal Crosstalk Attenuation Test
• IEC 61158 (Fieldbus Auxiliary Signal Cable Standards)

Standard voltage: 450/750V. This fully aligns with the standard operating voltages of domestic DCS (Distributed Control Systems), fire alarm differential detectors, and industrial instrumentation signal transmission systems, eliminating the need for custom voltage specifications in standard engineering projects.

Mainstream conductor cross-sections: 0.75mm², 1.0mm², and 1.5mm²; a custom 2.5mm² specification is available for long-distance tunnel signal trunk circuits.

Comprehensive range of twisted-pair unit specifications: 1 to 20 pairs (specifically including 1, 2, 3, 4, 5, 6, 8, 10, 12, 16, and 20 pairs), catering to diverse application needs ranging from single-channel instrument signal transmission to centralized integrated cabling for multiple DCS cabinets.

Conductor material standards: Utilizes 99.99% virgin T2-grade oxygen-free ultra-fine copper wire and employs a Class 5 flexible conductor compact stranding process to ensure stable, low-resistance transmission of low-current differential signals without signal attenuation.

• Long-term continuous operating temperature: 90°C (20°C higher than traditional PVC-insulated control cables), meeting the demands of long-term, full-load operation in enclosed, high-temperature DCS control rooms.
• Instantaneous short-circuit thermal limit: Withstands instantaneous temperatures of 250°C for 5 seconds without melting or dielectric breakdown of the XLPE insulation layer.
• Class B vertical bunched-cable flame retardancy: Complies with the IEC 60332-3B vertical bunched-cable combustion test, ensuring flames do not spread vertically along cable bundles installed in shafts or on cable trays.
• Low-smoke Class B standard: Smoke light transmittance ≥60% during open-flame combustion, ensuring clear visibility for evacuation and firefighting personnel in enclosed underground spaces.
• Halogen-free safety specifications: Total halogen gas emission <0.5%; produces no corrosive hydrogen chloride gas, preventing damage to expensive DCS main units, precision transmitters, and fire alarm detectors.
• Dual-layer shielding and comprehensive anti-interference performance:
  • Crosstalk attenuation for individually shielded pairs is ≥60 dB within the 0.1–50 MHz frequency range, effectively eliminating mutual interference between adjacent differential signal circuits;
  • Overall shielding attenuation is ≥45 dB, effectively isolating external interference from high-power motors, variable frequency drives (VFDs), and power distribution trunk cables;
• Minimum installation bending radius: 15 times the cable outer diameter; utilizes flexible conductors to support repeated small-radius bending within compact, multi-layer DCS cabinets;
• Operating temperature range: -20°C to +70°C; allows for standard routing, pulling, and bending operations in cold northern winter environments without the need for pre-heating;
• Factory delivery test standards: Each twisted-pair unit passes a 2 kV AC withstand voltage test (5-minute duration); 100% continuity testing is performed on both individual and overall shielding layers; random sampling for crosstalk attenuation is conducted for every production batch;
• Environmental adaptability: Features an enclosed dual-layer Low-Smoke Zero-Halogen (LSZH) inner and outer sheath structure with excellent resistance to moisture, mold, and mild acid/alkali corrosion; suitable for environments such as basement control rooms, wall-mounted brackets in municipal tunnels, and equipment trenches in semi-open industrial facilities.

• Low pair count (1–4 pairs): Signal wiring for individual temperature and humidity transmitters; transmission lines for single differential-temperature fire detectors; internal wiring for small field instrument control cabinets.
• Medium pair count (5–10 pairs): Signal trunk lines for workshop DCS substations; main lines for differential fire alarm signals in single-level installations.
• High pair count (12–20 pairs): Integrated cabling for multiple instrument groups connected to the DCS host in the central control room; centralized signal cables for full-length tunnel fire monitoring.

1. Dual-layer, double-shielding structure achieves extremely low signal crosstalk (Core Differentiator)

   Compared to WDZ-KYJRP cables that utilize only a single overall shield, WDZ-KYJYRP cables feature an independent copper tape shield for each pair of differential signal lines (twisted pairs) supplemented by an external overall shield, thereby creating a dual-layer isolation system. In applications such as DCS control rooms—where dozens of signal circuits are routed within the same cable tray—or petrochemical plants with dense instrumentation wiring, this independent shielding design completely eliminates crosstalk between adjacent signal pairs. This prevents issues such as analog signal drift, digital data packet loss, and measurement deviations. For differential fire detection systems in underground tunnels, stable differential signal transmission ensures the accuracy of early fire warnings and eliminates false alarms caused by internal circuit interference.

2. Fixed-pitch twisted-pair design optimizes differential signal transmission stability

   Each pair of signal lines employs a standardized fixed-pitch twisting process, effectively suppressing common-mode interference in differential signals caused by external alternating electromagnetic fields. In long-distance signal transmission scenarios (exceeding 500 meters)—such as municipal tunnels and factory workshops—this design maintains signal phase consistency, thereby resolving measurement errors in temperature transmitters and pressure sensors often associated with standard non-twisted shielded control cables.

3. Class 5 flexible conductors enhance wiring efficiency in compact DCS cabinets

   The flexible structure, composed of stranded ultra-fine copper wires, is perfectly suited for the confined internal spaces of multi-layer, high-density DCS cabinets and wall-mounted fire alarm control panels. Electricians are not constrained by the bending radius limitations associated with rigid cables when performing terminal crimping, cable routing, and bundling; this significantly shortens the installation time for multi-pair signal trunk lines and reduces labor costs for automation system integrators.

4. Comprehensive use of LSZH (Low-Smoke Zero-Halogen) flame-retardant materials prevents secondary hazards during fires in confined spaces

   All internal cable components completely eliminate the use of halogen-containing PVC materials. In the event of a fire in a DCS control room, underground tunnel, or basement equipment room, only a small amount of non-toxic white smoke is released; this neither obstructs visibility for rescue operations nor corrodes high-value DCS main units, precision transmitters, or fire alarm control equipment. The dual safety standards of "low smoke" and "zero halogen" have become mandatory requirements in tender specifications for public infrastructure projects, such as those in the petrochemical industry, hospitals, and municipal tunnels.

5. Thin-walled XLPE insulation reduces outer diameter, facilitating installation in high-density cable trays

   By utilizing a standardized thin-wall extrusion process for the XLPE insulation—while maintaining equivalent dielectric strength—the overall outer diameter of the WDZ-KYJYRP cable is significantly smaller than that of PVC-insulated, double-shielded twisted-pair cables with the same core count and cross-section. This allows for a higher density of signal cable pairs within limited cable tray and electrical shaft spaces, effectively resolving congestion issues associated with routing multiple instrument and fire detection trunk lines in large-scale complexes and chemical plant control rooms.

6. Stable, automated double-shielding production process ensures consistent EMC performance across batches

   Fully automated copper tape wrapping equipment precisely controls the overlap coverage for both the individual pair shields and the overall shield. Each production batch utilizes a consistent low-smoke zero-halogen (LSZH) flame-retardant polyolefin formulation and a standardized XLPE cross-linking process. Variations in key performance metrics—such as crosstalk attenuation, smoke density, and flame retardancy—are strictly controlled within extremely tight industry tolerances across batches, thereby eliminating the risk of failing EMC spot checks or fire safety regulatory inspections due to inconsistent cable quality.

• Industrial DCS (Distributed Control System) Signal Transmission

  Cabling for multiple temperature and pressure transmitters in petrochemical plant control rooms; differential signal trunk lines for DCS substations in new energy battery workshops; centralized control cables for field instruments on chemical production lines

• Municipal Underground Tunnel Fire Differential Monitoring Systems

  Signal transmission for fire differential detectors in urban road tunnels; twisted-pair cabling for gas leak monitoring in underground utility tunnels; smoke warning signal trunk lines for underground pedestrian passages

• Precision Fire Alarm and Medical Monitoring in High-Occupancy Public Buildings

  Interconnected cabling for vital sign monitoring equipment in Grade-III Class-A hospital wards; differential fire detection loops in large shopping mall basements; multi-circuit signal cables for fire alarm systems in airport terminals

• Instrument Control Loops for New Energy and Environmental Protection Facilities

  Environmental monitoring signal cables for photovoltaic power plant control rooms; twisted-pair cabling for online water quality analyzers in wastewater treatment plants; signal transmission lines for anemometers at wind farms

• Centralized Automatic Control Systems for High-Rise Complexes

  Main lines for fire differential detection in super-high-rise building basements; instrument signal cabling for office building HVAC DCS substations; multi-pair control cables for smoke monitoring in residential underground garages

1. Case Study 1: Supporting Project for a Central DCS Control Room at a Large-Scale Petrochemical Complex

   The project's process automation design institute specified the use of the WDZ-KYJYRP series—featuring dual-layer shielding and twisted-pair construction—to connect various field transmitters (temperature, pressure, and flow) to the central DCS host system. Previously, single-shielded WDZ-KYJRP cables had been discarded due to frequent measurement deviations caused by crosstalk between circuits, while PVC-based dual-shielded KYJVP2 cables failed to meet fire safety standards regarding Low-Smoke Zero-Halogen (LSZH) properties. Our factory provided comprehensive EMC test reports demonstrating crosstalk attenuation for the dual-shielded design, along with Class B LSZH flame-retardant certification; this ensured the project passed both fire safety and EMC inspections on the first attempt, requiring no remedial work. After two years of full-load operation, the DCS system has exhibited no measurement errors or signal loss faults across any of the instrument circuits.

2. Case Study 2: Electrical Engineering for Fire Monitoring Systems in an Urban Cross-River Tunnel (Phase II)

   The tender documents for this municipal project explicitly required that the main signal lines for the fire differential detection system utilize low-smoke, zero-halogen (LSZH), double-shielded twisted-pair control cables to withstand electromagnetic interference generated by high-power tunnel lighting and ventilation equipment. Design engineers ultimately selected the WDZ-KYJYRP model, as it was the only product capable of simultaneously meeting all electromagnetic compatibility (EMC) and fire safety performance specifications outlined in the tender. Our specialized instrumentation and electrical engineers assisted the procurement team in compiling the CCC mandatory certification, double-layer shielding attenuation test data, and IEC LSZH flame-retardant test reports. This ensured the product specifications fully aligned with the detailed technical requirements of the tender, thereby significantly boosting the contractor's overall evaluation score. Upon project completion, third-party on-site inspections confirmed that the cables successfully passed all tests regarding crosstalk and flame-retardant performance.

3. Case Study 3: Renovation Project for a New ICU in a Grade-A Tertiary General Hospital

   The hospital’s electrical and fire safety design team selected WDZ-KYJYRP multi-pair, double-shielded control cables for the patient vital-sign monitoring equipment and the differential fire detectors located in the basement. The double-shielded structure effectively isolates electromagnetic interference generated by high-frequency medical equipment—such as CT and MRI scanners—ensuring the real-time, stable transmission of differential signals for patient monitoring. The use of Low-Smoke Zero-Halogen (LSZH) flame-retardant materials throughout the installation ensures compliance with the stringent fire safety acceptance standards required for medical facilities. We provided customized, pre-cut cable lengths tailored to the specific wiring layout of each patient room, reducing cable waste by 15% and further optimizing the overall electrical material budget for the renovation project.

• Voltage Rating Selection Principles: Standard 450/750V WDZ-KYJYRP cables are to be used uniformly for all DCS instrumentation and fire protection differential signal circuits; no other voltage specifications are required for standard projects.
• Conductor Cross-section Matching Logic: 0.75 mm² or 1.0 mm² specifications are selected for short-distance (within 300 m) indoor instrumentation signal circuits; 1.5 mm² or custom 2.5 mm² specifications are used for long-distance (over 500 m) trunk lines in tunnels to ensure sufficient differential signal transmission margin and prevent signal attenuation.
• Twisted-pair Count Matching Standards: 1–4 pairs are used for signal transmission from a single instrument or detector; 5–10 pairs are used for centralized signal trunk lines serving a single workshop or floor; high-pair-count cables (12–20 pairs) are selected for multi-group integrated cabling in central control rooms.
• Application-Specific Guidance and Exclusions: WDZ-KYJYRP is the optimal choice for high-precision differential signal circuits requiring ultra-low crosstalk; for core fire pump emergency differential control trunk lines in super-high-rise buildings and subway projects, the specification must be upgraded to NH-KYJYRP (fire-resistant, double-shielded, twisted-pair cable); when installed in highly corrosive chemical workshops, fully enclosed metal conduits must be used to provide secondary isolation and protection.

• Mixed-routing spacing requirements: A safety clearance of 35 cm must be maintained between WDZ-KYJYRP multi-pair signal cables and high-current power distribution cables; when using multi-tier cable trays, metal partitions must be installed to block external sources of electromagnetic interference.
• Double-layer shielding grounding requirements: Both the individual pair shields and the overall cable shield must be reliably connected at both ends to the unified grounding busbar of the DCS cabinet; single-end grounding would result in a significant degradation of crosstalk attenuation performance and anti-interference capability.
• DCS cabinet internal wiring specifications: Leverage the small bending radius of flexible conductors to arrange and bundle cables neatly in layers; during installation, avoid contact with sharp edges of the metal cabinet that could scratch the cable's LSZH (Low Smoke Zero Halogen) outer sheath or internal copper tape shield.
• Installation in vertical shafts and on tunnel walls: Install mounting brackets at 1.5-meter intervals; when bundling multiple cable pairs, reserve a 25% clearance gap for heat dissipation to prevent temperature rises from compromising insulation performance and shielding stability.
• Low-temperature installation guidelines: The LSZH outer sheath retains good flexibility at temperatures as low as -20°C; consequently, no pre-heating is required prior to pulling, bending, or routing operations during winter construction projects for municipal infrastructure or factory automation in northern regions.

• Pre-order Qualification Review: Verify that the supplier holds CCC mandatory certification, an EMC test report for crosstalk attenuation with double-layer shielding, and a compliance certificate for Class B low-smoke, zero-halogen (LSZH) flame-retardant properties.
• Goods Receipt Spot Checks: Verify the integrity of the laser-printed markings on the outer sheath (specifying "WDZ-KYJYRP 450/750V + pair count × cross-sectional area"); inspect the overlap coverage of the independent copper tape, the uniformity of the stranded flexible copper conductors, and the consistency of the XLPE insulation thickness. For government-led projects involving chemical plants, tunnels, or hospitals, samples must be taken for third-party spot checks regarding EMC crosstalk and flame-retardant performance.
• Delivery Schedule Planning: For bulk orders intended for large-scale petrochemical plant DCS systems, municipal tunnels, or hospital ICU facilities, orders should be placed 11 to 16 working days in advance. This lead time accounts for the processes of conductor stranding, double-layer copper tape shielding application, and finished-product sampling/testing, thereby preventing installation delays for DCS systems and fire monitoring equipment caused by cable supply shortages.

• Full Compliance with Domestic Standards: All WDZ-KYJYRP double-shielded twisted-pair control cables fully comply with the GB/T 9330 control cable specification and the GB 31247 mandatory fire safety standard for Low-Smoke Zero-Halogen (LSZH) materials; all performance metrics meet the review requirements of construction quality supervision stations and fire rescue bureaus.
• Internationally Recognized Testing Qualifications: Certified against the full suite of IEC standards covering mechanical properties, fire safety, and EMC crosstalk attenuation for control cables; official test reports are available for tender submissions regarding overseas chemical plant, tunnel, and medical engineering projects.
• Comprehensive One-Stop Documentation Package: Includes CCC certification, EMC test reports (double-shielding crosstalk attenuation), test records for Category B bunched vertical flame retardancy and smoke/halogen emissions, factory batch inspection reports, quality certificates for Grade T2 virgin copper and LSZH flame-retardant plastic raw materials, technical parameter compliance tables for tenders, and special VAT invoices.
• Batch Quality Consistency Control: Each production batch utilizes standardized stranding for ultra-fine copper wires, consistent overlap rates for individual and overall copper tape wrapping, and stable LSZH flame-retardant formulations; batch-to-batch variations in EMC and fire safety metrics are minimal, eliminating the risk of acceptance failure caused by non-compliant multi-pair double-shielded control cables in specific batches.

1. Comprehensive Stock and Customization Support for WDZ-KYJYRP Double-Shielded Cables

   We offer a full range of specifications, spanning from 1-pair 0.75mm² miniature instrumentation twisted-pair cables to 20-pair 1.5mm² large-scale centralized control backbone cables. Ample stock is maintained for specifications commonly used in DCS projects for chemical plants, tunnels, and hospitals to ensure rapid delivery. Customization services—such as cut-to-length processing, laser printing of project-specific identifiers on the outer sheath, and integrated single-end grounding preparation for double-shielded cables—enable one-stop centralized procurement of LSZH double-shielded twisted-pair control cables, eliminating the need to coordinate with multiple suppliers.

2. Rigorous Five-Stage Quality Control System Covering Raw Materials to Finished Cables

   We utilize only premium imported LSZH flame-retardant masterbatches, Grade-1 T2 virgin ultra-fine oxygen-free copper, and highly ductile conductive copper tapes. We strictly prohibit the use of substandard recycled halogen-free plastics, thin non-conductive copper tapes, or copper wires with excessive impurities—materials that would compromise EMC (electromagnetic compatibility) and fire safety performance. A five-stage, end-to-end inspection process is implemented: halogen and conductivity testing of incoming raw materials; real-time online monitoring of ultra-fine copper wire stranding; automatic thickness detection during XLPE insulation extrusion; closed-loop control of copper tape overlap rates for pair and overall shielding; and batch sampling of finished cables for EMC crosstalk and flame-retardant performance. This approach effectively eliminates quality defects common among smaller manufacturers, such as incomplete pair shielding coverage, excessive internal signal crosstalk, high smoke emission, and brittleness or cracking of the LSZH outer sheath.

3. Direct supply from the manufacturer eliminates intermediary markups, reducing the total cost of automation and fire control projects.

   By bypassing distributor markups, we offer tiered pricing based on purchase volume for bulk orders of WDZ-KYJYRP cables—essential for DCS systems in large petrochemical plants, municipal tunnels, and hospital ICUs. Our in-house team of senior instrumentation, automation, and electrical engineers provides complimentary design optimization services, including differential signal cross-section and twisted-pair matching, as well as cable tray isolation layouts for mixed power and signal routing. We assist clients in selecting the most cost-effective WDZ-KYJYRP specifications while fully meeting requirements for ultra-low crosstalk EMC (Electromagnetic Compatibility) and Class B fire safety standards, thereby lowering the overall investment in instrumentation and fire-safety electrical materials for the project.

4. Specialized Pre-sales Technical Consulting Team for DCS and Fire Protection Systems

   Our electrical engineers possess over 15 years of experience in designing control systems for the petrochemical, tunnel, and medical instrument sectors. We provide comprehensive technical support to design institutes and automation system integrators, including: consulting on DCS differential signal loop design; providing downloadable crosstalk attenuation parameter tables for WDZ-KYJYRP double-shielded cables; preparing responses regarding EMC (Electromagnetic Compatibility) and LSZH (Low-Smoke Zero-Halogen) fire safety requirements found in tender documents; and offering guidance on compiling documentation for fire safety regulation compliance and construction acceptance. For government chemical industrial park and municipal tunnel projects, we assist in creating comparative tables—detailing double-shielded EMC performance and fire safety metrics—that meet stringent tender specifications, thereby significantly enhancing the competitiveness of contractors in the bidding process.

5. Automated, Integrated Production Lines for Double-Shielded Twisted-Pair Cables Ensure Stable, On-Time Delivery

   Multiple production lines—integrating XLPE continuous co-extrusion with automated double-layer copper tape wrapping—enable high daily output of WDZ-KYJYRP cables. Meanwhile, an extensive on-site raw material warehouse maintains ample stocks of ultra-fine copper wire, conductive copper tape, and low-smoke, zero-halogen (LSZH) flame-retardant materials. This capability ensures strict adherence to delivery schedules, even for large-volume orders required by chemical plant DCS systems or tunnel-wide fire monitoring systems, thereby eliminating the risk of work stoppages during DCS host installation or fire detector commissioning caused by supply shortages of double-shielded control cables.

6. Long-term, Full-lifecycle Technical Support for Double-Shielded Control Cables

   All delivered WDZ-KYJYRP model low-smoke, zero-halogen (LSZH), double-shielded control cables come with a 15-year manufacturer's quality warranty covering EMC crosstalk performance (for both individual and overall shielding) and LSZH fire safety standards. A professional technical team provides remote video guidance within 24 hours to address technical challenges encountered on-site, such as DCS cabinet wiring, double-shield grounding, and tunnel installation. For long-term partners—including chemical groups, municipal tunnel contractors, and hospital construction integrators—complimentary training on standardized procedures for DCS cabinet wiring and double-shield grounding is available. Dedicated profiles are maintained for high-volume, steady clients, and raw materials are stockpiled in advance based on project schedules for DCS installation and fire monitoring systems to shorten lead times for subsequent orders.

The WDZ-KYJYRP low-smoke, zero-halogen (LSZH), flexible, twisted-pair, double-shielded control cable is a high-precision differential signal transmission solution designed specifically for petrochemical DCS (Distributed Control Systems), municipal tunnel fire-monitoring instrumentation, precision medical monitoring equipment, and multi-loop centralized fire alarm systems. This product combines three irreplaceable core advantages: it utilizes an "individual pair shielding plus overall double-layer copper tape shielding" structure, ensuring extremely low crosstalk and superior electromagnetic interference (EMI) resistance; it employs Class 5 flexible conductors, facilitating easy routing within compact DCS cabinets; and it features Class B LSZH flame-retardant properties, meeting both fire safety and environmental protection standards. It effectively resolves two critical design challenges in high-precision instrumentation projects: measurement errors caused by internal circuit crosstalk and secondary safety hazards arising from toxic smoke during fire incidents in enclosed architectural spaces.

As a professional manufacturer of WDZ-KYJYRP double-shielded twisted-pair control cables, we hold comprehensive domestic CCC certification as well as international IEC EMC and fire safety testing qualifications. We are dedicated to providing a full range of standardized low-smoke zero-halogen (LSZH) double-shielded signal control cables, complete documentation support for acceptance and certification, and professional technical consulting for DCS and fire instrumentation electrical systems. We serve global petrochemical automation integrators, municipal tunnel contractors, medical facility design institutes, and procurement teams for high-precision signal control projects. We help projects requiring moderate fire-resistance ratings—specifically those involving differential signal transmission—successfully pass EMC crosstalk spot checks and fire safety acceptance inspections, ensuring long-term, stable, interference-free, and fault-free operation of precision instrumentation and fire detection differential signal circuits throughout the entire lifecycle of the equipment and facilities.