XLPE Insulated Dual Screen Instrumentation Cable for Precision DCS & SIS Safety Loop Wiring

WDZ-KYJYRP is a 0.45/0.75kV low-smoke halogen-free double-shielded control cable, specifically designed for high-precision Safety Instrumented Systems (SIS), DCS analog signals, fieldbus matching cabling, and other industrial projects requiring high electromagnetic interference and high fire resistance. It is an upgraded double-shielded derivative model based on the single-shielded KYJRP series control cables.

WDZ:

Low-smoke halogen-free; all insulation, inner filler, and outer sheath are made of halogen-free flame-retardant polymers without PVC halogens.

K:

Fixed-lay multi-core control cable, suitable for secondary circuit control and signal transmission cabling.

YJ:

XLPE cross-linked polyethylene single-core insulation.

Y:

Independently isolated inner shielding layer and outer sheath.

R:

Category 5 fine stranded copper conductor, with excellent bending performance, suitable for dense cabinet cabling.

P:

Overall secondary all-copper tape shielding layer on the outside of the cable core assembly.

Key structural features: It employs a single-core inner shield + double-layer outer shielding system, which is its biggest difference from KYJRP's traditional single-shielded control cables. The double-layer shielding structure effectively suppresses inter-core crosstalk and external electromagnetic interference, primarily used in SIS safety interlocking circuits and precision 4-20mA analog signal transmission. It is widely used in petrochemical refining, thermal power, chemical and pharmaceutical industries, hazardous waste treatment, and high-standard new energy substation automation projects. The number of cores can be selected from 2 to 61, and various single-core cross-section specifications are available to meet the needs of automation design institutes for multi-circuit centralized designs.

• Rated Operating Voltage U0/U: 0.45/0.75kV, matching the standard voltage level of secondary signal circuits for SIS, DCS, PLC, and field transmitters;
• Long-term Allowable Continuous Operating Temperature of Copper Conductor: 90℃ under rated stable load;
• Permissible Peak Temperature of Instantaneous Short Circuit (Short Circuit Duration within 5 seconds): 250℃;
• Single-core Factory Withstand Voltage Test: 2.5kV power frequency withstand voltage for 5 minutes, no insulation breakdown;
• Double-layer Shielding Technical Indicators: Inner core single-core copper tape winding coverage ≥93%, outer layer overall shielding copper tape overlap winding rate ≥96%, composite shielding attenuation ≥60dB in conventional industrial interference frequency bands, effectively isolating near-field frequency converter equipment and high-current power cable coupling interference;
• Distributed Capacitance: Optimized XLPE insulation formula reduces inter-core capacitance, suppressing long-distance signal waveform distortion in analog circuits.

• Conductor Standards: Compliant with IEC60228 and GB/T3956 standards, Class 5 flexible fine-stranded annealed copper conductors. Their flexible structure allows them to withstand repeated bending in compact control cabinets.
• Standard Stock Single-Core Cross-Section Sizes: 0.5mm², 0.75mm², 1.0mm², 1.5mm², 2.5mm²; Custom sizes of 4.0mm²/6.0mm² are available upon request for high-current control circuits.
• Core Count: Standard core counts are 2/3/4/5/7/8/10/12/14/16/19/24/30/37/44/48/52/61 cores. Custom production of non-standard/irregular core counts is supported to meet special engineering design requirements.
• DC Resistance Control: The conductor's DC resistance at 20℃ is strictly controlled below the standard upper limit to minimize line voltage drop during micro-signal transmission.

• XLPE Core Insulation: High-purity cross-linked polyethylene, with uniform extrusion wall thickness, exhibiting excellent anti-aging properties and insulation stability under long-term temperature fluctuations;
• Single-Core Inner Shielding Layer (Y): Tinned copper tape independently wound for shielding each core, fundamentally isolating electromagnetic crosstalk between adjacent signal cores;
• LSZH Halogen-Free Flame-Retardant Filler: Environmentally friendly filler fills the gaps between core wires, standardizing cable roundness and improving the overall flame-retardant performance of the bundle;
• Outer Total Shielding Layer (P): Continuously overlapping wound copper tape secondary shielding layer, blocking spatial radiation interference from external high-power equipment;
• Modified LSZH Outer Sheath: Added with anti-hydrolysis and anti-volatile chemical additives, suitable for humid industrial environments and slightly corrosive gas environments.

• For fixed installation, the minimum laying ambient temperature should be ≥0℃;
• The minimum installation bending radius should be ≥12 times the outer diameter of the finished cable;
• Standard applicable laying altitude ≤3000m; for high-altitude chemical industrial park projects above 3000m, a customized low-pressure resistant insulation formula can be provided.

• Double-layer Composite Anti-interference Capability: The inner layer features independent single-core shielding, while the outer layer provides overall shielding. This dual shielding design solves two major interference problems: inter-core signal crosstalk and external electromagnetic radiation interference. It ensures stable output of 4-20mA precision analog signals without drift, a core advantage of the SIS safety interlocking circuit.
• LSZH Low Smoke Halogen-Free Flame Retardant Safety: Certified by GB/T19666 WDZ flame retardant standards, with a smoke penetration rate exceeding 72%. It does not release toxic halogen corrosive gases, preventing corrosion of precision SIS modules in on-site fire accidents and meeting Class 1 fire-resistant industrial building acceptance standards.
• Class 5 Flexible Conductor Characteristics: The finely stranded flexible copper core reduces the probability of terminal breakage during dense cabinet cabling and repeated bending construction, significantly reducing the on-site cabling failure rate for automation contractors.
• Advantages of Low-Capacitance Cross-linked Polyethylene (XLPE) Insulation: Optimized insulation materials reduce the distributed capacitance of the entire cable, enabling stable long-distance signal transmission over 150 meters without signal distortion;
• Enhanced Anti-Aging Outer Sheath Performance: The improved low-smoke halogen-free (LSZH) sheath resists the corrosive effects of indoor humid environments and trace amounts of industrial volatile gases, with a nominal design service life of up to 27 years under standard fixed installation conditions;
• Compact Overall Structural Design: A rational layered layout keeps the cable outer diameter within a reasonable range, saving cable tray space and reducing the procurement costs of auxiliary accessories.

• Double-Layer Shielding Upgrade: Ordinary KYJRP cables only have a single-layer outer shield, which cannot eliminate inter-core crosstalk when multiple signal loops are bundled together; KYJYRP cables use independent single-core inner shields, completely solving the problem of inter-core interference, making them an ideal choice for multi-channel parallel precision signal engineering;
• Enhanced Bundled Flame-Retardant Formula: Optimized halogen-free flame-retardant filler improves the overall fire-retardant effect under dense multi-channel cable tray installation, preventing the spread of fire along centralized control lines in high-risk chemical workshops;
• Diverse and Flexible Customization Services: Supports small-batch trial orders, non-standard core counts, and mixed cross-section customized production, helping buyers reduce inventory backlog losses;
• Full-process online real-time production monitoring: The automated extrusion production line is equipped with online detection equipment for shielding coverage rate and insulation thickness. Each batch of finished products undergoes third-party sampling testing for shielding efficiency and smoke density before leaving the warehouse.

• Petrochemical and Refining SIS Safety Instrumented Systems: Wiring for safety interlock circuits in refinery cracking units and hydrogen production workshops; precision signal transmission from field safety transmitters to the central control room; mandatory double-shielding technical requirements stipulated in project bidding specifications;
• Large-scale Thermal Power and Cogeneration Unit Projects: Boiler SIS protection systems; wiring for turbine auxiliary monitoring instruments; centralized multi-circuit parallel wiring in the central control room DCS cabinet; high-interference environments around high-power generator sets;
• Fine Chemical and Pharmaceutical Smart Factories: Automatic control circuits in API production workshops; wiring for online monitoring sensors in sterile workshops; workshops containing trace amounts of volatile organic solvents and with strict fire prevention standards;
• Large-scale Energy Storage and New Energy Substations: SIS safety protection circuits for energy storage containers; precision analog signal transmission in centralized photovoltaic power station substations; strong electromagnetic radiation working environment in inverter rooms;
• Hazardous Waste Incineration Environmental Protection Projects: Safety interlock control circuits for incinerators; wiring for flue gas online continuous monitoring equipment; site laying of enclosed cable trenches in high-fire-risk industrial areas.

• Long-Distance Analog Signal Laying (>100m): All 4~20mA precision signal circuits must use the WDZ-KYJYRP double-shielded version. Single-shielded control cables are prohibited to prevent signal attenuation and distortion over long distances.
• Mixed Laying with Power Cables in the Same Cable Tray: When laid in the same cable tray as low-voltage/medium-voltage power cables, horizontal isolation barriers should be installed or a separation distance of ≥40cm should be maintained to further reduce electromagnetic coupling interference.
• High-Risk Chemical Workshop Construction: When the production area contains an environment with volatile organic solvents, a custom-designed model with corrosion-resistant reinforced sheaths should be selected to extend the cable's service life.
• SIS Safety Circuit Mandatory Specifications: According to international SIS engineering standards, core safety interlocking circuits must be equipped with double-shielded LSZH control cables. WDZ-KYJYRP is the designated model for fire safety acceptance.

Multi-dimensional verification focus from EPC procurement managers, automation system integrators, and overseas electrical distributors:

• Raw Material Documentation Review: Require suppliers to provide third-party inspection reports for low-smoke halogen-free compounds and tin-plated copper shielding raw materials before signing bulk contracts, verifying that no recycled or substandard raw materials are mixed into the finished product;
• Pre-shipment Third-Party Testing Agreement: A random sampling clause is included in the sales contract, allowing the buyer to designate a local authorized testing agency to test the double-layer shielding efficiency, smoke density, and flame retardant performance before container loading.
• Pre-order Technology Matching Confirmation: Submit the project's SIS/DCS wiring diagram and a description of the on-site laying environment to our technical team. Our professional control cable R&D engineers will optimize the core quantity and cross-section selection to avoid on-site rework due to incorrect procurement specifications.
• Delivery Schedule Coordination: Standard mainstream specifications are readily available from the factory, enabling rapid delivery within 5-8 working days. For non-standard customized specifications, a fixed production cycle will be confirmed during the pre-order negotiation stage to match the overall project construction schedule.
• Export Packaging Optimization: Export orders for cables are packaged using moisture-proof plastic reels and fumigated wooden pallets. The logistics department optimizes container stacking layout, improving space utilization and reducing unit sea freight costs for bulk importers.

WDZ-KYJYRP series products have all passed inspections by multiple authoritative institutions and can provide complete English certification documents for overseas bidding and destination customs clearance.

• Domestic Standards: GB/T9330 National Standard for Control Cables, GB/T19666 Standard for Low-Smoke Halogen-Free Flame-Retardant Cables;
• International Standards: Manufactured according to the core clauses of IEC60228, IEC60502, IEC60332, and IEC61034, conforming to the local electrical access specifications of major importing countries in the Middle East, Central Asia, Southeast Asia, and Africa;
• Complete Certifications: CCC Compulsory Product Certification, Fire Protection Product Type Approval Certificate, CNAS Accredited Laboratory Test Report, ISO9001 Quality Management System Certification, and ISO14001 Environmental Management System Certification, as well as all-English certification documents for bidding;
• Customs Clearance Assistance: Assisting the buyer in issuing certificates of origin and supporting customs clearance documents, expediting the customs clearance process at the port of destination.

• Professional Control Cable Technical Team: Equipped with senior engineers specializing in automated secondary circuits, providing free pre-order specification optimization consultation based on SIS/DCS design drawings, and offering remote online on-site troubleshooting support for engineering teams;
• Full-Process Traceable Quality Control System: Each roll of finished cable is accompanied by a unique batch tracking code, covering raw material inspection, online production monitoring, and finished product sampling inspection, facilitating quality traceability during final project acceptance;
• Flexible International Trade Cooperation Models: Supports various trade terms such as FOB/CIF/CFR, offering a dual cooperation model of small trial orders + annual long-term framework contracts. Long-term partners can enjoy tiered bulk purchase discounts;
• Stable Inventory and Global Logistics Network: Maintains real-time stock of standard specifications at the factory and collaborates with multiple top global freight forwarders to develop cost-effective transportation solutions, avoiding delivery delays caused by port congestion and logistics backlogs;
• Flexible Capacity Reserved: Reserves some production line capacity for long-term strategic partners to quickly respond to unexpected emergency replenishment orders during the later stages of project construction.