N-DJYV22 Fire-Resistant Armored Instrumentation Cable

When a control loop fails during a fire, the cost isn’t just measured in equipment damage. Emergency shutdowns fail to trigger. Fire pumps stop. Toxic release valves stay open. A cable that burns through in eight minutes buys you zero time to respond. N-DJYV22 cable is built to close that gap. It extends circuit integrity under direct flame so that field devices keep signaling when it matters most — during an evacuation or a critical automated shutdown sequence. This cable pairs mica-glass fire-resistant tape with polyethylene insulation and a double-layer steel tape armor. The result is a fire-survivable signal path that also handles direct burial and mechanical abuse on heavy industrial sites.

PE Dielectric, Stable Signals Even Before the Heat Hits

• Solid polyethylene insulation across all cores — low dielectric constant and minimal capacitance difference between pairs. Compared to PVC-insulated instrument cables, this reduces signal distortion on long analog loops. Plant technicians see fewer erratic readings on PLC inputs. That limits false trips and unnecessary field checks.

Mica Tape + PE Layer: Circuit Integrity Where Standard Cables White-Out

• Mica-glass fire-resistant tape wrapped directly over each conductor, rated to maintain electrical continuity at 750°C under shock conditions per IEC 60331 — emergency lighting, motorized fire dampers, and gas detectors still receive their control signals when the cable tray is engulfed. For a plant manager, this removes the single most common weak link in fire-safety system design.

Double Steel Tape Armor Without Conduit Complexity

• Galvanized steel tape applied helically in two layers with an overlap, bedded and sheathed in flame-retardant PVC — the cable resists crushing, impacts, and rodent attack in direct-buried installations or outdoor cable trenches. The installation team skips an entire step. No separate conduit or cable pipe, which cuts materials and labor on runs that often exceed 200 meters.

PVC Outer Sheath Tuned for Flame Retardance, Not Just Insulation

• Extruded fire-retardant PVC jacket complying with IEC 60332-1-2 flame spread tests — if a local fire starts in the cable tray, the jacket resists propagation along the cable length. The fire stays contained to a smaller zone. This matters for multi-cable fixtures where a single burning cable could otherwise cascade through the entire rack.

Technical Specifications & Dimensions

Actual test values and dimensional tolerances are documented in the factory test report supplied with each drum.

Industry Applications & Scenario Validation

• Onshore and offshore oil & gas remote I/O panels — N-DJYV22 links field transmitters in classified zones to RTUs inside safe-area marshalling cabinets. The steel tape armor eliminates the need for extra mechanical protection on pipe racks exposed to dropped objects or jet fire conditions.

• Tunnel ventilation and life-safety control circuits — Road and rail tunnels demand signal cables that survive the hydrocarbon fire curve long enough to keep jet fans and damper actuators responsive. This cable’s mica-tape construction answers the firewater / smoke-logged scenario where evacuation time depends on active smoke control.

• Power generation balance-of-plant instrumentation — From coal mills to ash handling, instrument cables run through areas with high fire load. Fire-resistant PE-insulated pairs prevent backup turbine supervisory instruments from going blind during a fuel-spill fire event.

• Chemical processing and bulk storage terminals — Armored cable in underground ducts takes the mechanical stress of heavy truck traffic and soil settlement without micro-cracking the insulation. The fire-resistant barrier provides an extra window for operators to trigger ESD valves before actuator air lines fail.

• Commercial high-rise fire-safety loops — Elevator recall, stairwell pressurization fans, and fire alarm interface modules need circuit integrity beyond the typical 30-minute building requirement. This cable supports phased evacuation sequences in super-tall structures where total egress time exceeds one hour.

International Compliance & QA Standards

• ✅ IEC 60331-11:1999 — Fire-resisting characteristics under fire conditions; circuit integrity at 750°C with mechanical shock
• ✅ BS 6387:2013 — Performance requirements for cables required to maintain circuit integrity under fire conditions (CWZ classified configurations available upon request)
• ✅ IEC 60332-1-2 — Test for vertical flame propagation for a single insulated wire or cable
• ✅ IEC 60502-1 — Power cables with extruded insulation (referenced for construction principles)
• ✅ CE marking under the Low Voltage Directive (2014/35/EU) for rated voltage up to 500 V
• ✅ RoHS 3 (EU 2015/863) — Restricted substances compliance verified via third-party lab testing batchwise
• ✅ ISO 9001:2015 — Quality management system certification covering design, manufacture, and test of all factory-assembled cable types
• ✅ Factory audit and type-test documentation available for customer pre-qualification review

FAQ

How do we confirm the cable meets the 90-minute fire-resistance claim with mechanical shock?
We conduct type testing on representative production samples at an ISO 17025-accredited third-party laboratory. The test follows IEC 60331-11 where the cable is energized at rated voltage, exposed to 750°C flame temperature, and struck with a steel bar at defined intervals. Test reports with sample traceability are included with the project documentation package. Routine factory fire tests on a portion of each batch verify electrical continuity at high temperature.

Can you supply N-DJYV22 with overall or individual pair shielding added?
Yes. We offer variants such as N-DJYPV22 (individual pair foil shield plus overall foil) and N-DJYPVP22 (individual and overall foil shields). Shielding reduces electromagnetic interference in signal pairs carrying 4–20 mA loops next to variable-frequency drive cables. If your EMC plan calls for shielding, specify the variant at inquiry stage and our application engineers will confirm the transfer impedance figures for the shield construction.

What minimum order length applies and how do you handle island or remote-site logistics?
Standard drum lengths are 500 meters and 1000 meters per drum, but we accept split lengths down to 100 meters for trial installations. Multi-drum export orders ship in flat-rack containers or on steel stillages with weather-resistant wrapping. We pre-book vessel space for major mining and offshore projects. Lead times start at 4–6 weeks for standard configurations of 30 km or less, and we keep buffer stock of common 2-pair and 4-pair 1.5 mm² constructions in bonded warehouse hubs in Jebel Ali and Antwerp.

Request the Full N-DJYV22 Datasheet and Price Breakdown

For technical submittals, cable tray ampacity calculations, or a cost-per-meter comparison that factors in conduit elimination, contact our engineering support desk at [email/contact link]. Include the core count, conductor size, estimated route length, and the fire-resistance standard your project specification cites. We return a datasheet, drum schedule, and ex-works or CIF pricing within one business day.