8-Core 0.15mm² STP Twisted Pair Signal Cable
Signal errors in a multi-drive installation don’t start with a bang. A single corrupted bit is enough. A false reading triggers a shutdown, an actuator overshoots, or a batch logs contaminated. Maintenance teams spend hours tracing intermittent faults that disappear the moment someone opens the panel door. Most times the culprit isn’t the PLC or the sensor. It’s the cable carrying low-voltage data through an aggressive electromagnetic landscape. Replacing it after pulling hundreds of meters costs far more than the cable itself. This 8-core 0.15mm² STP twisted pair cable is designed to prevent those expensive re-pulls. One cable handles four differential channels with a shielding architecture that keeps motor noise, inverter spikes, and crosstalk out of your signal path. Your controls engineer gets clean data. Your site manager hits the commissioning deadline.
Shielded pair + overall braid. Because one barrier is not a strategy.
[Feature] Each of the four twisted pairs is individually wrapped in aluminium-polyester foil, followed by a tinned copper braid (≥85% coverage) under the outer jacket.
[Advantage] The foil blocks high-frequency radiated noise; the braid handles low-frequency magnetic fields and provides a low-impedance path to ground.
[Benefit] You can route this cable alongside VFD motor cables and arc-welding lines without adding ferrite clamps or re-spinning the cable tray layout. No more ghost tripping on E-stop circuits fed by RS-485 data links.
8 cores / 4 pairs designed for multi-drop differential protocols
[Feature] 8-core configuration arranged as four twisted pairs, colour-coded per IEC/EN standards (e.g., white/blue, white/orange, white/green, white/brown). 0.15 mm² (24 AWG) stranded bare copper conductors.
[Advantage] One cable carries four balanced transmission lines, cutting the gland count, cable tray fill, and termination time by half compared to running four separate shielded pairs.
[Benefit] When a SCADA upgrade demands separate Modbus RTU trunks for meter racks, flow totalisers, and valve controllers, you pull one 8-core bundle instead of three or four individual cables. Fewer entries into sealed cabinets means fewer potential leak points in an IP66 enclosure.
Stranded 0.15 mm² conductors for cabinets where space hates stiff cables
[Feature] Flexible stranded bare copper, fine-wire construction that meets VDE 0295 / IEC 60228 class 5 flexibility requirements.
[Advantage] Small bend radius (typically 8 × outer diameter for fixed installation) and low spring-back allow clean routing inside compact VFD cabinets or junction boxes.
[Benefit] Panel builders terminate faster when the cable lies where they put it, not where it wants to go. Every saved hour on site wiring goes straight to margin.
PVC jacket standard. LSZH sheath when the project document demands it.
[Feature] Standard outer jacket in black, flame-retardant PVC. LSZH (low smoke zero halogen) compound available as a factory option for the same core construction.
[Advantage] PVC keeps unit cost lean and meets general industrial flame tests. LSZH, produced on the same line, reduces toxic smoke and acid gas release, satisfying the safety case for underground metro, railway signalling, and data centres.
[Benefit] You don’t need to split the order across two suppliers. One vendor, one spec sheet adjustment, same lead time logic for either version. That keeps the procurement package tidy.
Technical Specifications & Dimensions
Parameters shown are typical measured values for the standard PVC-jacketed version. Custom constructions can be engineered on request.
| Parameter | Value / Description |
|---|---|
| Conductor | Stranded bare copper, 0.15 mm² (approx. 24 AWG) |
| Conductor construction | 7 × 0.16 mm, fine wire, class 5 (IEC 60228) |
| Insulation | Solid polyethylene (PE), nominal wall 0.25 mm |
| Core identification | White/blue, white/orange, white/green, white/brown (pair colour code) |
| Pair twist lay length | ≤ 40 mm (optimised for 1–10 MHz noise suppression) |
| Individual pair screen | Aluminium/polyester tape, 100% coverage, metallic side in contact with drain wire |
| Drain wire per pair | Tinned copper, 7 × 0.16 mm |
| Overall screen | Tinned copper braid, minimum 85% coverage |
| Outer sheath | Black PVC, flame retardant per IEC 60332-1-2 |
| Outer diameter (nominal) | ~7.2 mm |
| Weight (approx.) | 65 kg/km |
| Rated voltage Uo/U | 300/500 V (per signal-grade design; not intended for power transmission) |
| Characteristic impedance | 100 Ohm ± 15% (1–10 MHz) |
| Mutual capacitance (conductor to conductor) | ≤ 55 pF/m at 1 kHz |
| Capacitance unbalance (pair to earth) | ≤ 3 pF/m at 1 kHz (screened condition) |
| Operating temperature – fixed | -20°C to +70°C |
| Minimum bending radius – fixed | 8 × outer diameter |
| Minimum bending radius – flexing | 15 × outer diameter (occasional flexing only; not for continuous drag chains) |
| Loop resistance | ≤ 290 Ohm/km at 20°C |
| Sheath colour | Black (RAL 9005) standard; optional colours available |
| Packing | 100 m spool, 500 m drum, or cut-to-length ordered per project |
Industry Applications & Scenario Validation
- Factory automation & machinery OEM – Connects encoder, flow meter, and temperature transmitter over RS-485 without dropping packets when the adjacent motor contactor pulls in.
- Building management systems (BMS) – Carries BACnet MS/TP or Modbus RTU across ceiling voids and plant rooms cluttered with lighting ballasts and HVAC VSDs. The overall braid prevents random CRC errors that force polling retries.
- Power generation & T&D substations – Links IEDs (Intelligent Electronic Devices) inside high-EMI switchgear cubicles for station-level control (IEC 61850 goose messaging layer often uses copper interconnects at short range where fibre is uneconomical).
- Railway platforms & tunnels – LSZH variant meets smoke-density and toxicity limits (EN 45545-2) for passenger station communication loops, public-address links, and emergency phone systems.
- Process industry (chemical & petrochemical) – Transmits 4-20 mA/HART signals from field transmitters to junction boxes in Zone 2 areas; the foil + braid screen handles walkie-talkie and mobile phone interference during maintenance rounds without tripping live process alarms.
International Compliance & QA Standards
- ✅ Designed and manufactured within an ISO 9001:2015 quality management system.
- ✅ RoHS 2.0 (Directive 2011/65/EU) compliant for lead-free, cadmium-free, and restricted substances across all materials.
- ✅ CE marking available under the Low Voltage Directive (LVD) 2014/35/EU when ordered for the European market.
- ✅ Flame propagation test: IEC 60332-1-2 (single cable vertical flame spread). Pass criteria applied as default.
- ✅ Conductor and insulation conformity: IEC 60228 (conductor class), IEC 60092 series (insulation materials where relevant).
- ✅ Can be supplied to meet the structural recommendations of IEC 61156-2 for multicore symmetrical pair/quad cables where specified by the customer’s data sheet.
- ✅ Third-party test reports (SGS, TÜV, Bureau Veritas) arranged for container-level orders. Factory invites witnessing of type tests.
FAQ
Q: Can you match a specific characteristic impedance tolerance outside the standard ±15% window?
A: Yes. For long-haul RS-485 runs at 115.2 kbps or higher where reflected wave tolerance is tight, we adjust the insulation compound, pair geometry, and screening lay length during extrusion to achieve a 100 ± 5 Ohm window. A pre-production sample is sent with a TDR printout for your sign-off before the production run starts.
Q: How do you manage cable with different pair markings or non-standard jacket colours?
A: Pair colours can follow DIN 47100, ICEA, or your internal wiring schedule. Jacket colours from RAL inventory—signal yellow, blue, orange, grey—carry no MOQ penalty if the compound is a standard stock item. Digital artwork for jacket hot-foil marking or ink-jet printing is reviewed within 48 hours.
Q: What is the practical continuous bus length using this cable for Modbus RTU at 19.2 kbps?
A: With proper termination (100 Ohm ±5% resistors at both ends) and a single daisy-chain topology, we’ve seen customers deploy 1,100 metres without repeaters in electrically quiet environments, and around 800 metres when the cable shares a tray with low-voltage motor cables. Your earthing scheme at the control panel and field device end governs more than the cable itself. We usually request a simple site floorplan to flag potential ground-loop risks before shipping.
Q: Is an oil-resistant version available for hydraulic machinery and machine tool coolant zones?
A: We offer a PUR (polyurethane) jacket option that retains the same foil + braid shielding. It handles mineral oil, cutting fluid splash, and occasional abrasion. The outer diameter increases by approximately 0.3 mm due to the tougher jacket wall. Lead time for PUR adds three to four working days.
Next step
Ask your technical team which three parameters matter most: impedance, capacitance unbalance, or jacket halogen content. Your answer determines the exact production recipe. Send us your line diagram, site protocol list, or panel layout if you want our signal integrity engineer to run an interference check—at no charge, before a single metre ships. Reach the product engineering desk directly at [email/contact form] or request a factory visit to run comparative tests on your own network analyser.