NH-DJYJVP Fire-Resistant Double-Shielded Computer Cable | DCS Instrumentation

• Conductor: High-purity oxygen-free annealed copper wire, Class 5 flexible stranded structure, copper purity >99.95%; common cross-sectional areas: 0.5mm², 0.75mm², 1.0mm², 1.5mm², 2.5mm²
• Fire-resistant mica tape wrapping: Individually wrapped around each insulated core to form a high-temperature barrier, ensuring 90-minute fire resistance
• XLPE (Cross-linked Polyethylene) extruded insulation: Uniform wall thickness, low dielectric loss, insulation resistance ≥100MΩ·km; maintains stable electrical performance under long-term temperature fluctuations
• Optimized twisted-pair structure: Scientifically configured fixed lay length to minimize mutual inductive interference between signal circuits
• Individual copper braid shielding for pairs: Shielding coverage ≥85%, providing independent shielding protection for each signal twisted pair
• Non-hygroscopic PP filler: Optimizes cable roundness, prevents moisture ingress, and enhances overall fire resistance and structural stability
• PVC inner sheath: Isolates the pair shielding layer from the overall shielding layer, preventing accidental internal short circuits
• Overall copper braid shielding: Shielding effectiveness ≥90dB; effectively resists power-frequency interference and high-frequency electromagnetic radiation interference in industrial environments
• Outer flame-retardant PVC sheath: Resistant to aging, oil, acids, alkalis, and weather; offers supplementary flame-retardant properties; suitable for outdoor and harsh indoor environments

• Rated operating voltage: 300/500V
• Power-frequency withstand voltage test: 1500V; no breakdown after 1 minute
• Maximum DC conductor resistance at 20°C: Complies with GB/T 3956 standards; strictly controlled to prevent excessive voltage drop during long-distance signal transmission
• Inter-conductor capacitance: ≤120pF/m; low-capacitance design minimizes signal attenuation in long-distance cabling
• Overall shielding effectiveness: ≥90dB; effectively suppresses 50Hz power-frequency interference and radiated interference from variable-frequency equipment

• Long-term continuous operating temperature range: -40°C to +90°C
• Minimum ambient temperature during installation: ≥0°C (based on the point of protective sheath embrittlement/cracking)
• Low-temperature resistance for fixed installation: -40°C; minimum temperature for flexible/mobile installation: -15°C
• Fire resistance rating: Complies with the Class A and Class B fire resistance test requirements of GB/T 19666; maintains circuit continuity for 90 minutes under direct flame exposure at 750°C–950°C.

• Standard non-armored type (NH-DJYJVP) minimum bending radius: ≥10 times the cable outer diameter
• Armored type (NH-DJYJVP22) minimum bending radius: ≥12 times the cable outer diameter
• Tensile-resistant structural design: Suitable for installation in cable trenches, conduits, overhead lines, and custom direct-burial applications
• Standard pair configurations: 1×2, 2×2, 3×2, 4×2, 6×2, 8×2, 10×2, 12×2, 16×2, 24×2, 37×2; non-standard pair counts can be customized based on specific project requirements

1. 3.1 Reliable fire-resistant performance meeting fire safety acceptance standards

   Conventional computer cables rapidly lose their electrical conductivity when exposed to open flames. Our NH-DJYJVP cable features a design that combines double-layer mica tape fire-resistant wrapping with an integrated fire-resistant sheath. In the event of a fire, the cable ensures stable, continuous transmission of emergency control signals for up to 90 minutes, guaranteeing the proper coordinated activation of fire safety systems such as fire dampers, smoke exhaust fans, fire pumps, and fire shutters. The product complies with mandatory fire safety acceptance codes for high-risk industrial facilities, super-high-rise buildings, and key public infrastructure projects, thereby eliminating the risk of project remediation caused by non-compliant cable selection.

2. 3.2 Dual-shielding structure ensures highly stable precision signal transmission

   By employing a combined structure featuring "individual pair shielding plus an overall dual-shielding layer," this design effectively resolves two major challenges frequently encountered by automation engineers during project implementation:

   • Signal distortion in 4–20mA analog instrumentation caused by electromagnetic interference from high-power motors, variable frequency drives (VFDs), and power distribution cabinets;
   • Signal crosstalk and deviation between multi-channel DCS data acquisition loops in environments with densely laid cables.

   Compared to single-shielded computer cables, this structure reduces the signal error rate by over 95%, thereby significantly shortening system commissioning times for contractors and substantially lowering labor costs associated with long-term operation and maintenance.

3. 3.3 XLPE insulation extends long-term service life and reduces project renewal costs.

   Compared to traditional PVC-insulated signal cables, XLPE insulation offers superior resistance to high temperatures, oxidative aging, and cracking, as well as enhanced resistance to oils and chemical corrosion. Suitable for use in damp workshops, environments with chemical vapors, and dusty industrial production facilities, the material is designed for a service life exceeding 30 years. This enables owners and general contractors to effectively reduce the capital expenditure required for subsequent periodic maintenance, replacement, and system upgrades.

4. 3.4 Adaptability to Diverse Installation Environments and Customizable Armoring

   Suitable for indoor cable trenches, conduit routing, overhead suspension, and semi-outdoor fixed installations. For underground environments prone to mechanical crushing, rodent damage, or puncture by sharp objects, a steel-tape armored version (Model NH-DJYJVP22) is available to enhance mechanical protection, meeting the requirements for underground utility tunnels and direct-burial pipeline projects.

• Petrochemical and Refining Industries

  Used for DCS (Distributed Control System) cabling—connecting pressure, temperature, and flow transmitters—and supporting emergency interlock control loops for reactors, storage tank monitoring systems, and dedicated intrinsically safe signal circuits in Zone 1 and Zone 2 hazardous areas.

• Thermal, Hydroelectric, and New Energy Power Plants

  Suitable for signal transmission in boiler monitoring systems, auxiliary measurement circuits for steam turbines, fire emergency linkage circuits, internal wiring for generator auxiliary control cabinets, and centralized data acquisition cabling for monitoring systems in photovoltaic and wind power plants.

• Fire Protection Systems for Super-high-rise and Civil Buildings

  Trunk and branch lines connecting fire alarm control panels to smoke and heat detectors; control circuits for fire pumps, smoke exhaust valves, and fire dampers; emergency control lines for fire shutters; and main linkage cables for basement fire protection systems. Uses designated cable models that comply with fire safety acceptance and handover standards.

• Metallurgical and Heavy Industrial Workshops

  PLC automatic control signal transmission in environments with strong electromagnetic interference; connection cables for online monitoring instruments; safety interlock control circuits for workshop emergency protection equipment; and fixed wiring for long-term installation in high-temperature production workshops.

• Municipal Infrastructure and Public Transportation Projects

  Fire protection system wiring for subway stations; linkage cables for fire monitoring and control in highway tunnels; signal lines for automatic instrumentation in wastewater treatment plants; and signal transmission cables for bridge structural health monitoring systems.

1. Case Study 1: DCS Upgrade and Retrofit Project for a 120,000-ton/year Ethylene Petrochemical Unit

   Project Requirements: Replacement of aging conventional signal cables; for multi-channel analog signal acquisition in explosion-proof workshops, the cables required fire-resistant properties and exceptional anti-interference capabilities.

   Solution Implemented: NH-DJYJVP 12×2×1.0 mm² double-shielded, fire-resistant computer cables; total supply volume: 186,000 meters.

   Project Outcomes: Passed third-party testing for fire resistance and electrical performance; operated continuously for three years without signal interference issues; passed the plant's periodic safety audits; complied with international petrochemical engineering design standards.

2. Case Study 2: Fire Protection System Project for a 58-Story Super-High-Rise Office Building

   Project Requirement: Fire emergency control cables had to meet the 90-minute fire resistance rating mandated by national fire safety standards to pass final inspection.

   Solution Implemented: NH-DJYJVP 8×2×1.5mm² backbone cables paired with NH-DJYJVP 2×2×1.0mm² branch cables; total order volume: 92,000 meters.

   Project Outcome: Successfully passed fire safety inspection and overall building handover; the fire linkage system operated reliably, earning unanimous approval from the general contractor and property management team.

3. Case Study 3: Centralized Monitoring Project for the Auxiliary Equipment Workshop of a 300MW Thermal Power Unit

   On-Site Challenge: Severe electromagnetic interference (EMI) generated by variable frequency drives (VFDs) caused persistent signal jitter in the existing standard computer cables.

   Solution Implemented: Custom-manufactured NH-DJYJVP double-shielded, fire-resistant cables featuring enhanced shielding coverage.

   Project Outcome: Completely eliminated signal fluctuations; reduced on-site system commissioning time by 40%; long-term stable performance earned recognition from engineers at the electric power design institute.

• GB/T 9330: General specification for control and computer cables
• GB/T 19666: Classification and test methods for flame-retardant and fire-resistant cables
• GB/T 12666: Test methods for flame-retardant characteristics of cables

• CCC: China Compulsory Certification
• CE Certification (Compliance with EU Low Voltage Directive)
• ISO 9001 (Quality Management System), ISO 14001 (Environmental Management System), ISO 45001 (Occupational Health and Safety Management System)

• Factory inspection reports, third-party fire-resistance type test reports, and full-process material traceability certificates
• CPR certification and IEC standard test documentation available to meet European market tender requirements

1. Rigorous raw material inspection to eliminate project risks

   All copper materials are sourced from large, reputable, and fully certified smelters. We conduct comprehensive inspections on parameters such as copper purity, melt flow rate of insulation materials, and the fire resistance of mica tapes, strictly prohibiting the use of recycled copper or substandard insulation materials. This effectively prevents post-installation issues—such as excessive conductor resistance or insulation breakdown—thereby reducing the risk of project claims and remediation costs for purchasers and general contractors.

2. Flexible customization capabilities to meet unique, non-standard project requirements

   We offer customization options for conductor cross-sectional areas, non-standard pair counts, and armored or unarmored configurations. Products can be upgraded to the WDZN-NH-DJYJVP (Low-Smoke, Zero-Halogen, Fire-Resistant) specification upon request. Outer sheath colors, surface print content, and sequential length markings can be tailored to match client construction drawings. Sample reels are available for pre-tender testing, helping design institutes and engineering firms shorten their product validation cycles.

3. Direct supply from the manufacturer to maximize project profit margins

   Eliminates intermediary markups; unit prices are negotiable for large-scale bulk orders, and flexible Minimum Order Quantity (MOQ) policies are available for contractors. Offers consolidated container loading solutions for large-volume overseas buyers, effectively reducing overall shipping and logistics costs.

4. Full-lifecycle technical support provided by professional engineers

   A specialized electrical engineering team offers consultation on cable selection, optimization of installation plans, and drafting of technical specifications for tenders.

   Provides official technical data sheets, structural dimension drawings, and installation guidelines for design review and approval.

   Transparent and traceable production progress; comprehensive electrical performance test reports are provided prior to delivery to ensure reliable, on-time fulfillment.

   Offers global remote technical consultation to assist in resolving on-site installation issues for overseas projects.

5. Export-grade packaging and complete customs clearance documentation

   Packaging utilizes export-standard wooden reels featuring moisture and impact protection, suitable for long-distance maritime and overland transport. We provide packing lists, commercial invoices, certificates of origin, and other customs documentation to streamline the export clearance process for overseas buyers.

1. Shield grounding specifications: DCS instrumentation control systems typically employ a single-end grounding design; dual-end grounding is strictly prohibited to prevent induced interference caused by potential differences in the grounding loop. Specialized installation guidelines for grounding can be provided upon request.

2. Bending radius control: Minimum bending radius requirements must be strictly observed during cable pulling and bending operations. Excessive bending can damage the internal braided shield and insulation layers, potentially leading to intermittent signal faults during subsequent operation.

3. Fire-Separation Routing Requirements: In the design of fire protection systems, and in accordance with local fire safety codes, this cable must be routed separately from high-current power cables while maintaining a safe clearance distance to minimize the risk of flame spread during a fire.

4. Cable Storage and Management: Finished cable reels should be stored in a dry, well-ventilated warehouse; avoid prolonged exposure to direct sunlight and rain to prevent premature aging of the cable sheath.

5. Model Distinction: It is essential to clearly distinguish between NH-DJYVP (overall shielding only) and NH-DJYPVP (aluminum foil pair-wise shielding). NH-DJYJVP features cross-linked polyethylene (XLPE) insulation and a dual-shielding structure (including copper wire braiding), offering superior high-temperature stability and interference resistance; it is better suited for projects requiring high signal precision and multi-channel transmission.

6. Voltage Limitations: This cable is designed specifically for 300/500V signal control circuits; it is strictly prohibited for use in main power transmission lines to prevent insulation breakdown caused by overloading.

If you require a quote, technical datasheet, product confirmation, or professional selection advice for NH-DJYJVP cables, please submit your request via the inquiry form on our website. Please be sure to specify the required number of pairs, conductor cross-sectional area, order quantity, and destination country. Our professional cable engineering team will provide a tailored technical solution and a highly competitive quote within 24 working hours. We welcome the opportunity to establish long-term framework partnerships with global engineering contractors, automation system integrators, electrical distributors, and design institutes.