N-DJYP2VP2 Fire-Resistant Computer Cable

Electrical noise in a petrochemical plant can trigger unplanned shutdowns. In a fire, standard control cables melt and short-circuit within minutes. Entire safety systems go blind. Emergency shutdown valves fail to close. This cable was engineered to prevent exactly that scenario. The N-DJYP2VP2 maintains signal integrity under direct flame exposure while rejecting electromagnetic interference in dense cable trays.

It buys time. Time for safety instrumented systems to complete their logic sequences. Time for operators to isolate hazards. That is the only metric procurement teams and instrumentation engineers should care about.

Multi-Layer Shielding for Signal Fidelity in Noisy Environments

Individual Pair Shielding + Overall Shield
Each twisted pair carries copper tape screening, then the entire core gets wrapped in an additional copper tape and braid composite shield.
Signal coupling between adjacent pairs drops below measurable thresholds. 4-20 mA instrument loops, RS-485 serial communications, and low-voltage digital signals arrive at the PLC clean. The ground loop headaches that plague unshielded or single-shielded installations disappear. On a refinery’s hydrocracker unit or a steel mill’s continuous caster, that means fewer nuisance trips.

Fire Resistance That Exceeds Circuit Integrity Standards

Mica Glass Tape Fire Barrier on Every Conductor
Standard flame-retardant cables stop burning when the ignition source is removed. They do not keep transmitting data during a fire. This cable is different. The mica tape insulation remains electrically intact at temperatures where copper itself begins to soften.
Emergency shutdown systems, firewater pump controls, and smoke extraction fans continue receiving commands. Compliance with IEC 60331 for circuit integrity under fire is not theoretical. It has been verified through third-party testing. Ask us for the reports.

Low Smoke Zero Halogen (LSZH) Sheath for Confined Spaces

Halogen-Free Compound That Won’t Kill Your Personnel
PVC burns. It releases hydrogen chloride gas that combines with moisture in the air and in human lungs to form hydrochloric acid. Control rooms, tunnels, offshore accommodation modules, and underground rail stations cannot tolerate that risk.
The LSZH jacket on the N-DJYP2VP2 produces virtually no halogen acid gas and minimal smoke density. Evacuation routes remain visible. Equipment in adjacent cabinets suffers less corrosive damage. Insurance premiums often reflect this material choice positively.

Designed for Dense Multicore Termination

Precision Stranding and Color-Coded Pairs
Terminating 24-pair cables inside a marshalling cabinet is a repetitive, error-prone task. Misread colors cause crossed loops. Stranded copper conductors that kink or break during wire stripping slow down commissioning teams and erode project margins.
This cable uses precision-laid, color-coded pairs with consistent twist pitches and a jacket that strips cleanly without sticking to the shield. Termination errors drop. Commissioning checkouts accelerate. For the EPC contractor, fewer callbacks and liquidated damage risks.

Technical Specifications

Larger conductor gauges, different pair counts, and armoured variants are standard catalog extensions. Contact us with your instrument index or cable schedule.

Industry Applications

• Oil & Gas Refineries and Petrochemical Plants
  Used in F&G (Fire & Gas) detection loops, ESD (Emergency Shutdown) valve control, and DCS I/O marshalling where cable trays span hazardous areas. The dual shielding prevents false alarms from adjacent high-voltage feeders.

• Offshore Platforms and FPSO Vessels
  Accommodation modules and escape routes demand halogen-free materials. Salt-laden marine air attacks inferior cable jackets within months. This cable’s LSZH compound resists corrosion while the tinned copper braid provides a robust shield drain path.

• Underground Rail and Road Tunnel Infrastructure
  Tunnel ventilation fans, evacuation lighting control, and public address systems must remain operational during a vehicle fire for a minimum time window defined by local fire codes. Smoke density matters as much as circuit integrity. The LSZH jacket addresses both.

• Thermal and Nuclear Power Generation
  Turbine supervisory instrumentation and balance-of-plant controls cannot tolerate signal distortion. The composite shielding structure rejects the extremely low-frequency magnetic fields that plague single-shielded cables near generator buses.

• Industrial Automation and Steel Manufacturing
  Frequent VFD starts, arc furnace flicker, and production floor vibration destroy lesser cables. This cable’s mechanical robustness and 100% shield coverage ensure data packets reach the PLC without corruption.

International Compliance & QA Standards

• ✅ IEC 60331-21 — Circuit integrity under fire (tested at third-party laboratory)
• ✅ IEC 60332-1-2 — Flame retardance for single vertical wire
• ✅ IEC 60754-1/2 — Halogen acid gas emission below normative limits
• ✅ IEC 61034-2 — Smoke density measurement confirming LSZH classification
• ✅ IEC 60228 — Conductor construction (Class 2 stranded copper)
• ✅ CE Marking — Low Voltage Directive conformity
• ✅ RoHS (2011/65/EU) — Restriction of hazardous substances
• ✅ ISO 9001:2015 — Manufacturing quality management system certified

Full type test certificates, FAT (Factory Acceptance Test) protocols, and cable samples for client lab verification are available upon request.

FAQ

Q: How should installation teams handle the mica tape barrier during termination to avoid compromising circuit integrity?

Mica tape is brittle. It cracks under excessive bending or when installers use aggressive stripping tools designed for PVC insulation. The correct method is to ring-cut the jacket, score the shield carefully, and then use a thermal stripping tool or a calibrated mechanical stripper set to a shallower depth to remove the LSZH insulation without disturbing the mica layer. After crimping or clamping the ferrule, we recommend applying a thin heat-shrink sleeve over the stripped section to lock any loose mica particles in place. This adds ten seconds per termination and eliminates the leading cause of post-fire circuit failure at marshalling cabinet entries.

Q: Does the copper tape pair shielding require individual drain wires, or is the overall braid sufficient for grounding?

Each pair has its own copper tape shield, and they are not electrically bonded to each other internally. They must be terminated individually at the instrument end and floated at the marshalling cabinet end (single-point grounding). The overall tinned copper braid is a separate shield layer intended for cable tray-level EMI and is earthed at both ends through gland connections to the tray structure. Misconnecting the pair shields and overall shield creates ground loops that inject 50/60 Hz noise directly onto the signal circuits. Our technical notes include clear wiring diagrams for standard DCS and PLC termination cards.

Q: We need to specify this cable for an ATEX/IECEx zone 1 installation. Does the LSZH jacket meet static dissipative requirements?

The standard black LSZH jacket holds a surface resistivity above 10^9 ohms. That does not automatically qualify it as anti-static under IEC 60079-0. For hazardous area installations where static charge accumulation on the cable surface is a concern, we offer a modified jacket formulation that brings surface resistivity below 10^9 ohms while retaining the same halogen-free and low-smoke performance. This must be stated on the purchase order. Ex-certified glands and correct bonding practices remain the installer’s responsibility.

Cable Specification and Quotation Requests

Send your instrument index, hazardous area classification drawing, or cable schedule to our engineering support team. We review the document package and return a detailed technical compliance statement, a proposed cable cutting plan to minimize waste, and a firm delivery lead time within two working days.

Partial drum lengths, single-pair samples for type testing, and expedited air-freight shipments for shutdown-critical orders are all available options.