ZA-NH-DJYP3V Cable

Signal failure in a live process loop isn’t just an inconvenience. It can halt production, corrupt batch records, or trigger a safety shutdown nobody budgeted for. The ZA-NH-DJYP3V instrument cable is built to remove that uncertainty. It keeps signal paths clean in electrically noisy environments and maintains circuit integrity long enough for safe shutdown when a fire breaks out—two things that directly protect uptime and on-site safety.

Signal Protection Under Interference and Fire

ZA-grade flame retardance
A-class flame retardance per GB/BS EN standards means the cable restricts flame propagation along a vertical cable bundle. In a multi-cable tray fire, this limits damage to a single zone. Your adjacent circuits keep working longer, reducing secondary failures and firefighting damage to other systems.

NH fire resistance (circuit integrity)
The mica-taped conductor or fire-resistant layer holds the copper circuit closed for 90 minutes under direct flame at 750°C, per IEC 60331. Emergency shutdown valves, pressurisation fans, and evacuation alarms get the power they need. You meet local fire code without having to oversize trays or add expensive redundant protection.

Aluminium/polyester tape individual screen (P3)
Each pair or core set is wrapped in a 100% coverage bonded aluminium/polyester tape with a tinned copper drain wire. This is not a woven braid with gaps—it’s a full foil shield that stops high-frequency EMI from VFDs, motor starters, and adjacent power cables. The result: 4–20 mA loops and RS-485 buses run without zero shifts or bit errors. you don’t waste hours chasing ghost signals during commissioning.

Polyethylene insulation (Y)
Solid polyethylene keeps mutual capacitance low—typically under 85 pF/m for 0.5 mm² pairs. Low capacitance preserves pulse shape on long Modbus runs and extends usable cable distance without repeaters. Procurement stays on budget. The project avoids expensive fibre-optic retrofits because the copper path “just works” across the plant.

Heavy-duty PVC sheath (V)
The black polyvinyl chloride jacket resists mineral oil, UV, and mild acids common in process skids and wastewater treatment plants. No cracking after 18 months outdoors. No sheath replacement during a two-year warranty walk-through. One less snag in the punch list.

Technical Specifications & Dimensions

Industry Applications & Scenario Validation

• Petrochemical & refinery process instrumentation
  Intrinsically safe loops and 4–20 mA transmitter signals run in Zone 1/Zone 2 areas. The aluminium tape screen prevents false trips caused by walkie-talkie frequencies or pump-motor spikes.

• Tunnel and underground metro ventilation
  Smoke extraction fans and fire dampers must operate during a tunnel fire. The NH circuit integrity keeps control signals live when temperatures rise—no early collapse of the life-safety control chain.

• Pulp & paper and wastewater plants
  Corrosive mist, constant humidity, and aggressive cleaning agents degrade standard sheaths. The oil-resistant PVC sheath and mica fire layer survive years of washdown cycles without insulation resistance loss.

• Data centres and logistics hubs
  Long RS-485 and BACnet MS/TP bus loops connect BMS controllers across separate fire zones. A-class flame retardance prevents a cable fire in one zone from migrating into the next compartment through the cable tray.

• Power plant balance-of-plant
  Turbine lube-oil systems, boiler feed-pump motors, and generator auxiliaries create hot, EMI-heavy environments. The PE insulation’s low dielectric constant keeps differential-mode signals stable even when the cable passes close to the bus duct.

International Compliance & QA Standards

✅ IEC 60332-3-22 — Flame propagation, Category A (vertical tray test)
✅ IEC 60331-21 — Circuit integrity under fire, 750 °C for 90 minutes
✅ BS EN 50288-7 — Instrumentation and control cables for analogue and digital signals
✅ IEC 61034 — Smoke density, light transmittance ≥ 60 %
✅ ISO 9001 — Quality management system, factory audited and certified
✅ RoHS (2011/65/EU) — Hazardous substance restriction, full material declaration available
✅ CE marking — LVD 2014/35/EU, assessment on file

FAQ

1. How does ZA-NH-DJYP3V differ from a standard DJYP3V cable?
Standard DJYP3V is flame-retardant but has no fire-resistance rating. The “NH” (fire-resistant) layer—usually a mica tape—maintains electrical continuity during a fire. If your project requires the cable to keep control circuits running for evacuation or emergency shutdown, NH is the mandatory suffix. A “Z” without “NH” only retards flame spread; it does not guarantee circuit integrity under fire.

2. Can you supply this cable with blue sheath for intrinsically safe loops?
Yes. Sheath colour can be changed to light blue (RAL 5015) for IS identification, and the construction is fully compatible with IS installation rules—no changes to the aluminium/polyester screen design are needed. Just specify the sheath colour and pair count in the enquiry.

3. What screen bonding method do you recommend for long cable runs?
We recommend bonding the drain wire at one end only for low-frequency analogue loops to prevent ground-loop hum. For digital buses above 100 kHz, bond both ends through 1–10 nF capacitors or directly if the building has an equipotential mesh. Include your frequency plan in the request for comments and we will add the recommended bonding diagram to the submittal.

Call to Action

Send us your cable schedule, loop diagram, or fire-safety zone layout. You will receive a full technical proposal with core configurations, sheath options, and lead times—no generic catalogue links.

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