ZA-NH-DJYV22 Cable: Fire-Survival Data Transmission for Life-Safety Circuits
Downtime caused by signal loss during a fire isn’t just an operational failure. It is a life-safety liability. When emergency shutdown systems, smoke extraction fans, or fire pumps lose communication due to cable circuit integrity failure, the result is regulatory non-compliance and catastrophic asset loss. The ZA-NH-DJYV22 cable is designed to maintain instrumentation and control signal transmission under direct flame for 180 minutes. This means system operators get critical data precisely when they need it most. It also means your infrastructure meets the stringent fire-safety bypass clauses increasingly written into large-scale infrastructure contracts.

Armoured Integrity for Heavy-Duty Trench Environments
The steel wire armouring on this cable does more than deflect a shovel strike.
In petrochemical plants and underground metro tunnels, electromagnetic interference (EMI) from adjacent high-voltage power cables distorts low-voltage instrumentation signals.
The galvanized steel wire braid (SWB) layer acts as both a mechanical guard and an electromagnetic barrier.
Combined with an inner copper tape screen, the cable achieves superior transfer impedance.
You prevent 4-20 mA signal drift.
Control logic remains stable.
The nuisance of sporadic shutdown triggers disappears from the SCADA terminal.
This dual-layer shielding is specific to the V22 variant, offering a hard physical defense against rodent damage and mechanical abrasion in direct burial applications without additional conduit.

Zero Halogen, Low Smoke: Securing Escape Routes
Standard PVC jackets turn into dense, acidic, black smoke chambers within minutes of exposure to fire.
For evacuation routes and control rooms, visibility and air toxicity are the primary killers.
The ZA-NH-DJYV22 utilizes a low-smoke zero-halogen (LSZH) polyolefin compound for its bedding and outer sheath.
Feature: Halogen-free sheath material compliant to IEC 60754-1/2.
Advantage: Acid gas emission is below 0.5% during combustion.
Benefit: Corrosion of nearby switchgear terminals is minimized.
The immediate commercial benefit is twofold: secondary damage cleanup costs drop significantly, and insurance engineers will note the reduced risk profile of the asset.

Termal Barrier for Copper Conductors
Heat resistance in fire-rated cables often fails at the binder tape.
We wrap the conductor assembly in a glass-mica tape with a refined overlap percentage to eliminate gaps.
Under the 950°C flame test curve, the mica layer sinters into a cohesive insulating dielectric shell.
This prevents phase-to-phase short circuiting.
It keeps the stranded bare copper conductors operational beyond the standard 180-minute circuit integrity period (classified under IEC 60331).
For procurement managers, this removes the need to double-up on redundant control loops purely for fire survivability. One cable does the work securely.

Technical Specifications & Dimensions
The table below contains the verified engineering data for standard production runs. Custom conductor cross-sections are available upon technical review.

Parameter
Specification
Conductor Material
Stranded bare copper (Class 2)
Fire Performance Rating
ZA-NH (Class A Flame Retardant, Fire-Resistant)
Circuit Integrity
180 minutes (IEC 60331)
Operating Voltage U₀/U
300/500 V
Armor Layer
Galvanized Steel Wire Braid (V22)
Shield (Optional)
Copper Tape (SE)
Insulation
Fire-resistant Mica Tape + XLPE/PE
Bedding
LSZH Compound
Outer Sheath
LSZH Polyolefin (ST8 to IEC 61034)
Smoke Density
Min. 60% Light Transmittance
Flame Retardancy
IEC 60332-3-24 (Category A)
Temperature Range (Fixed)
-15 °C to +70 °C
Bending Radius
15 x Cable Diameter

Industry Applications & Scenario Validation
Petrochemical & Refinery: Connects emergency shutdown (ESD) actuator feedback loops, ensuring signal integrity during a hydrocarbon flash fire when polyester-based cables would yield.
Underground Mass Transit: Installed in tunnels for fire alarm and ventilation fan controls. Resists the piston-effect air pressure and tunnel humidity without jacket degradation.
Nuclear & Thermal Power Plants: Used in distributed control systems (DCS) plant auxiliaries where cable must survive seismic vibration and high-temperature steam leakage simultaneously.
High-Rise Commercial Façades: Powers and controls the stairwell pressurization systems, maintaining a smoke-free evacuation path in line with strict vertical building codes.
Process Water Treatment: Buried directly in soil for pump telemetry; the steel wire armor negates the cost of PVC conduit while blocking earth currents.

International Compliance & QA Standards
Every batch is electronically tested for partial discharge and spark-tested prior to dispatch. The construction adheres to the following rigid acceptance criteria:

✅ IEC 60331-21: Circuit integrity under fire at 950°C.
✅ IEC 60332-3-24: Category A vertical flame propagation on bunched cables.
✅ IEC 60754-1/2: Absence of corrosive halogen acid gas evolution.
✅ IEC 61034-2: Measurement of smoke density; minimum light transmittance.
✅ GB/T 19666 (National Standard): General requirements for flame retardant and fire resistant wires.
✅ Factory ISO 9001: Quality management system audited for lot traceability of copper and polymer batches.

FAQ
Can this cable carry both power and signal in a multi-core configuration?
No. The 300/500 V rating is specifically for low-voltage instrumentation, intercom, and alarm loops. The XLPE dielectric insulation is gauged for signal fidelity, not high-ampacity power transmission. We strictly separate power and core electronics signal wires to avoid induction noise. If you require a composite power/data survivability cable, a custom engineered solution with segregated inner cores can be reviewed by our design team.

What makes the ZA-NH compound effectively stop burning without PVC?
The distinction lies in the polymer backbone. PVC contains chlorine. When it degrades, it releases HCl, which thickens smoke and corrodes metal. Our sheath compound uses a heavily loaded metal hydrate filler in a polyolefin base. When hit by flame, it releases plain water vapor. The compound self-extinguishes the drip, and the ‘ZA’ rating confirms it halts vertical flame spread along a cable riser, denying fire the path to leap between floors.

How do you handle the termination of the steel wire armor?
Proper glanding matters. We recommend using a brass compression or serrated wedge cable gland rated for single-wire armour. The gland must bridge the steel wire to the switchgear earth bar directly. This creates a low-impedance path for the fault current without relying on an internal drain wire. Our data sheet specifies the exact gland size tolerance for multi-point earthing, which is critical for compliance with electrical safety installation rules.

Submit Your Project Cable Schedule for a Certified Datasheet
Selecting the precise cross-section area for 180-minute circuit integrity loads requires checking the voltage drop over the full cable route. Send your cable schedule and termination environment details. Our engineering group will return a signed, traceable factory datasheet, including de-rated thermal short-circuit values and specific bending radius calculations, within 48 business hours.