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ZA-NH-DJYVP2 Fire-Resistant Shielded Instrument Cable for Critical Circuit Integrity

When a fire breaks out, standard cables become liabilities. They combust, propagate the flame, and release dense, toxic smoke that obscures escape routes and corrodes nearby equipment. The single greatest threat to emergency shutdown systems during a fire is not the heat—it is circuit failure. The ZA-NH-DJYVP2 cable is engineered to neutralize this risk. Designed for copper-based instrumentation loops demanding uncompromised signal integrity, it maintains circuit continuity under direct flame, supplying low-smoke, halogen-free safety where evacuation and asset protection are non-negotiable.

Signal Integrity Under Duress: Multi-Layer Shielding Architecture

• Laminated Aluminum/Polyester Tape with 100% Coverage + Tinned Copper Drain Wire
  The first line of defense against electromagnetic interference. This composite tape eliminates the penetration holes common in standard braids, creating a Faraday cage effect. Static and capacitive noise are captured and routed to the drain wire. Signal distortion drops below measurable thresholds, ensuring your PLC or DCS receives clean, actionable data even when routed near high-voltage power cables.

• Total Shielding: Individual Pairs + Collective Over-Shield
  We apply a dual-stage shielding philosophy. Individual twisted pairs are screened first. Then, the entire core receives a collective shield. This prevents crosstalk between circuits within the same cable. For plants running mixed-signal trays—combining low-voltage analog sensors with digital communication lines—this isolation layer prevents ghost signals and false alarms.

• Bare Copper Conductor (Class 1/2 Solid or Stranded)
  We keep the conductor simple and effective. No tin plating to oxidize or introduce unwanted contact resistance variation in low-current loops. You get a stable, predictable electrical path from sensor to termination block.

Low-Smoke, Zero-Halogen: Passive Fire Safety Engineering

• Polyolefin-Based LSZH Insulation and Sheath Compound
  This is a material choice designed for human safety and asset survival. When forced to pyrolize, the compound releases virtually no hydrogen chloride, hydrogen fluoride, or other acidic gases. Why this matters: gaseous acids mix with water from sprinkler systems to form hydrochloric acid. That acid migrates into control panels and destroys circuit boards untouched by the actual fire. Our LSZH jacket prevents this secondary, catastrophic loss.

• Transparent Smoke Density Performance
  Smoke density must exceed 60% light transmission during a burn test per IEC 61034. This metric is visual. It translates directly to how many seconds your team has to exit a compromised corridor. High-density black smoke kills before the flames do. This cable is engineered to keep the escape route visible.

Flame Retardance That Bends the Burn Curve

• Class A Flame Retardant Ranking (Cat A Filler / Tape Base)
  Class A is not a label. It is a volumetric test requirement requiring the cable to self-extinguish while bunched in a vertical tray with a defined fuel load. We use inorganic, mineral-based flame barriers beneath the sheath. These barriers form a crust that blocks thermal penetration. For vertical risers connecting floors in a high-rise, this is mandatory behavior. Without it, the cable tray acts as a chimney.

• Fire Resistance Temperature: 750°C – 800°C for 90 Minutes (IEC 60331 Standard Testing)
  Circuit integrity under direct fire is a race against the clock. We guarantee operation for 90 minutes at a minimum of 750°C. That window covers structured evacuation and controlled emergency shutdown procedures. The silicone-impregnated glass mica tape wrapped around each conductor converts to an insulating dielectric shell when the polymer jacket burns away protection continues.

Technical Specifications & Mechanical Dimensions

No guesswork. Confirm these values against your routing and termination requirements.

Validation by Sector: Where This Cable Operates

• High-Rise Commercial MEP (Smoke Extraction Fans)
  Fire dampers and extraction fans must run during a burnout, not shut down. The cable connects the motor to the dedicated fireman’s override panel. During the 90-minute rating, the mica tape insulates the conductor while the LSZH jacket prevents corrosive smoke from killing backup generator intake filters.

• Metro Rail & Underground Transit (Tunnel Ventilation)
  Enclosed underground spaces compound smoke density instantly. Standard PVC in a tunnel fire suffocates passengers before rescue teams arrive. This LSZH composite sheath keeps egress signage and sump pumps running in the event of a traction power short circuit.

• Oil, Gas & Petrochemical (Emergency Isolation Valves – EIV)
  Remote I/O cabinets near cracking units face explosive atmospheres alongside intense radiant heat. The dual-shield design rejects the electromagnetic pulse generated by nearby fault currents, and the mica tape ensures the valve closes completely during a jet fire before the pipeline depressurization sequence fails.

• Data Centers & Co-Location Facilities (Power Management Systems)
  Lithium-ion battery storage arrays require gas detection and thermal runaway monitoring. The individual pair screening preserves the milli-volt signals from hydrogen sensors while the rugged LSZH jacket ensures that, should a battery rack ignite, the monitoring circuit remains online long enough to trigger the VESDA and gaseous suppression release.

• Transit-Oriented Developments (Mixed-Use Complexes)
  These projects combine retail, parking, and residential loads. Emergency lighting inverters installed in parking levels rely on this signal cable to communicate with the BMS. The construction is rodent-repellent by default—the steel wire armor option prevents gnawing damage in false ceilings without relying on toxic chemical repellents.

International Compliance & Quality Assurance Checklist

No need to dig through fragmented datasheets. We maintain a transparent compliance portfolio:

• ✅ IEC 60331-1 & 60331-21 – Circuit Integrity Under Fire (90-minute rating at 750°C)
• ✅ IEC 60332-3-22 – Flame Spread Classification (Category A – Vertical Tray Bunched)
• ✅ IEC 61034-2 – Smoke Density Measurement (LSZH Verification)
• ✅ IEC 60754-1 & 60754-2 – Halogen Gas Acidity & Conductivity Test
• ✅ IEC 60228 – Conductor Class Compliance (Solid/Stranded)
• ✅ RoHS 3 (EU 2015/863) – Hazardous Substance Restriction
• ✅ Low Voltage Directive (LVD) 2014/35/EU – CE Marking Conformity
• ✅ ISO 9001:2015 – Batch Traceability for Raw Material & Production

Technical Inquiries from the Field

Q: We run 4-20mA loops over long distances (800m+). How does the individual pair shield impact loop impedance and signal rise time?
The aluminum tape shield introduces a consistent capacitive load per meter, factor this into your voltage compliance budget. For your 800m run, expect roughly 120-150 pF/m capacitance between the conductor and the shield. The total capacitance of ~0.1 µF will not distort a standard 4-20mA signal, but if you are superimposing HART digital protocols, we recommend limiting cable runs to the HART physical layer limit of 3,000m. The drain wire cross-section (0.75mm² minimum) ensures low ground loop resistance. Terminate the drain wire at one end only. At the PLC cabinet. Not the field device. This prevents 50/60 Hz hum injection.

Q: We need to terminate these cables in a Zone 2 area with standard brass glands. Do the LSZH jacket and inner tape hold a concentric grip, or will we experience cold flow over temperature cycles?
The cross-linked polyolefin jacket resists cold flow better than a thermoplastic LSZH. Torque your IP-rated gland to the recommended setting. For a safety margin, specify the “compaction fit” for our outer sheath—the fill ratio of the armoring beneath the jacket is high, providing a solid backstop. We supply an extruded bedding layer, not a loose wrap. This prevents the jacket from deforming into the interstices of the armor under heat cycling. Request a sample cut for a pre-fitting trial.

Q: We are replacing an older PVC cable (non-fire rated) in an elevator shaft. Do we need to replace the cable tray, or can we strap this directly due to the reduced weight?
You can strap this. The LSZH compound has a lower specific gravity than PVC, making the cable approximately 10-15% lighter by linear meter. This helps with vertical load on long risers. However, the jacket friction coefficient is slightly higher than PVC. If you are pulling it through a conduit that previously housed PVC, use ample talc-based pulling lubricant compatible with polyolefin—mineral oil-based lubricants will degrade the outer sheath over time. Never use dish soap.

Begin Your Project-Specific Cable Schedule

Sourcing a fire-resistant cable that decouples signal noise from circuit integrity does not need to be complicated. We manufacture to panel specifications, not just stock codes. Provide us with your pair count, screen preferences, and mechanical protection needs. You will get a factory-direct price, a raw material certificate, and a lead time that matches your project’s critical path.

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