ZA-DJVPVR Cable: Signal Integrity Under Fire

Data loss in a running process costs more than the cable itself. It means unplanned downtime, corrupted batch records, and hours of diagnostic labour. The ZA-DJVPVR cable is designed to prevent that exact scenario. Engineered for signal transmission in environments with heavy electromagnetic interference, it combines flame-retardant armour with precision shielding so your instrumentation loop remains stable when everything around it isn’t.

Why Shielding Architecture Changes Everything

A cable carrying a 4-20 mA signal from a pressure transmitter runs alongside VFD motor cables in the same tray. Without proper shielding, the induced voltage corrupts the signal. The PLC reads a false value. The operator reacts to bad data. We have designed the ZA-DJVPVR specifically to break this failure chain.

Copper Wire Braid Shield + Aluminium/Polyester Tape
Individual pairs are wrapped in aluminium/polyester tape with a tinned copper drain wire in contact. Over that sits an overall copper wire braid shield. This dual-layer approach handles both near-field capacitive coupling and far-field electromagnetic interference. The result for your panel is a signal-to-noise ratio that keeps PLCs reading true—no ghost trips, no missed alarms, no scrambled telemetry.

XLPE Insulation Across All Cores
We do not use PVC for the core insulation. Cross-linked polyethylene (XLPE) gives the dielectric a higher temperature rating and better insulation resistance than PVC can offer when wet. For a field engineer, this means the cable continues performing after a gland leak or a flooded duct. You don’t lose the loop. You don’t lose visibility.

LSZH Outer Sheath
Burning PVC cable releases dense, toxic hydrogen chloride gas and thick black smoke. In a control room or a tunnel, that smoke is what kills people before flame does. The ZA-DJVPVR uses a low-smoke zero-halogen (LSZH) sheath. If the cable is exposed to fire, emissions are minimal, light-obscuring smoke is greatly reduced, and corrosive gas release drops to nearly zero. This specification directly supports your project’s fire safety engineering and site evacuation protocols. It also simplifies compliance with EN 50267 and IEC 60754.

Galvanised Steel Wire Armour (SWA)
The “ZA” prefix indicates the armour classification. A layer of galvanised steel wires sits beneath the outer sheath. This provides mechanical protection against crushing forces—useful when cables are pulled through congested conduit or buried directly without additional ducting. It also gives the cable its high tensile strength during cable pulls. On a construction site, you install it once and you don’t revisit it to fix crush damage.

Technical Specifications

The table below contains the measured and nominal values for standard production. For any parameter not listed, request the full datasheet.

Values typical for standard production. Tolerances apply per inspection batch. Contact engineering for cable diameters matched to specific core counts.

Where This Cable Works Hardest

Site conditions dictate cable specification. These are the environments where the ZA-DJVPVR matches the physical and electrical demands without over-engineering the bill of materials.

• Heavy industrial process plants (chemical, petrochemical, steel). Signal cables run adjacent to high-voltage motor feeders in open cable ladders. The combination of SWA and dual shielding prevents coupling errors in DCS analog input cards.
• Water and wastewater treatment facilities. Wet wells, digesters, and chemical dosing skids expose cabling to moisture and corrosive atmospheres. XLPE insulation resists water treeing; the LSZH sheath will not accelerate corrosion on adjacent stainless steel pipework if combustion occurs.
• Tunnel and underground metro ventilation control. Fire safety codes mandate halogen-free materials in enclosed underground spaces. This cable meets the smoke and toxicity thresholds needed for tunnel sensor loops and damper actuator control.
• Power generation — balance of plant instrumentation. Coal handling, ash disposal, and cooling water systems generate dust, vibration, and humidity. The braided armour absorbs vibration transmitted through traywork, protecting the twisted pairs inside.
• Pharmaceutical and food-grade manufacturing zones. DCS and SCADA loops in washdown environments require cables that will not introduce toxic particulate or gas if exposed to a steam line rupture or an electrical fault. LSZH materials eliminate that contamination vector.

Compliance and Quality Markers

Before procurement signs off, they check certifications. The following list maps to the documentation we provide as standard with every consignment.

• ✅ IEC 60332-1-2 – Flame retardance for a single insulated wire or cable.
• ✅ IEC 60754-1/2 – Determination of halogen acid gas content and degree of acidity.
• ✅ IEC 61034-1/2 – Measurement of smoke density of cables burning under defined conditions.
• ✅ EN 50267 – Common test methods for cables under fire conditions (Corrosivity).
• ✅ IEC 60228 – Conductors of insulated cables (Class 1/2 copper compliance).
• ✅ CE Marking – Conforming to relevant EU directives, including Low Voltage Directive 2014/35/EU.
• ✅ RoHS 3 (2015/863/EU) – Restriction of hazardous substances in cable materials.
• ✅ ISO 9001:2015 – Certified quality management system across manufacturing and testing.

Full type test reports and material certificates are available with the shipping documents. Third-party inspection by SGS or Bureau Veritas is accepted at our facility within the inspection notice period.

Questions Engineers Ask Before Specifying

Can I use this cable for intrinsically safe (IS) circuits under IEC 60079-14?
Yes, with attention to colour identification. The standard requires light blue for IS circuit cables or terminals. By default, our sheath is black. Specify RAL 5015 (light blue) outer sheath at the RFQ stage. The cable’s electrical parameters—capacitance and inductance per kilometre—must be checked against the barrier manufacturer’s allowed entity parameters. We supply the L/R ratio and capacitance values on the datasheet so your hazardous area designer can verify compatibility.

What is the difference between the individual-pair shielding and the overall braid?
This is a common point of confusion. The aluminium/polyester tape on each twisted pair creates a Faraday cage that prevents one pair’s signal from capacitively coupling onto the adjacent pair within the same cable (cross-talk). The tinned copper wire drain makes terminating this shield at the marshalling cabinet fast. The overall copper wire braid, sitting over the assembled pairs, provides a low-impedance path to ground for external EMI from nearby power cables or radio transmitters. If you only have an overall shield, you still get external protection but risk inter-pair interference. If you only have individual shields and no overall braid, a strong external field can penetrate. The ZA-DJVPVR includes both precisely to eliminate that trade-off.

Delivery is tight. What standard core counts do you keep in bonded stock?
We hold semi-finished inventory for 1, 2, 4, 8, 12, and 16 pair configurations in our main distribution hub. These common counts ship within 5-7 working days from an order confirmation with a clean drawing approval. Larger counts—24 pairs and above—are built to order with a standard lead time of 3-4 weeks. Armoured cable cannot be rushed through the extrusion and braiding stages without introducing quality risks, so we do not offer unrealistic expediting promises. A firm schedule is issued within 24 hours of the PO.

Get the full electrical performance curve and dimensional drawing.

This page covers the specification logic. The datasheet contains the core-by-core diameter table, capacitance values per metre, and the derating factors for elevated ambient temperatures. Send us your cable schedule or loop list. We return a marked-up datasheet confirming the exact stock code, lead time, and CIF pricing to your port. Write to your account engineer or request the pack using the button below.