RVVP 3x0.75mm² Multi-core Shielded Sensor Signal Cable Low Noise Braided Copper 300/500V for Transmitters

RVVP 3x0.75mm² Multi-core Shielded Sensor Signal Cable Low Noise Braided Copper 300/500V for Transmitters

Cable Designation & Meaning

Construction: Three 0.75 mm² fine-stranded copper conductors, PVC insulation on each core, laid up together, tinned copper braid shield (≥85% coverage) over the laid-up cores, PVC outer sheath.

Applicable Standards

• GB/T 5023.5-2008 / IEC 60227-5 — Polyvinyl chloride insulated cables — Flexible cables (cords)
• GB/T 3956-2008 / IEC 60228 — Conductors of insulated cables (Class 5 flexible)
• GB/T 18380.3 / IEC 60332-3 — Flame retardant (Category A/B/C as specified)
• GB/T 5023.2-2008 / IEC 60227-2 — Test methods

RVVP 3×0.75 mm² — Flexible Shielded Signal Cable — Specification 

1. Overview & Ratings

RVVP 3×0.75 is a 3-core shielded signal cable rated 300/500 V. It uses pure annealed bare copper (not tinned) for both the conductor and braid, maximizing conductivity. The three 0.75 mm² cores are laid up in a triangular formation and typically serve as power, signal and ground for 3-wire sensors and instrumentation. The braid suppresses EMI/RFI from nearby VFDs and motors. OD ≈ 7.5 mm, ≈ 55 kg/km (est.), ≈ 4–6 A. Max conductor temperature 70 °C, -15 to +70 °C. Intended for dry indoor signal circuits; for damp or outdoor duty, specify tinned copper variant. Not for power distribution or direct burial.

2. Construction Stack (Inner → Outer, expanded)

3. Electrical Characteristics

DC resistance ≤ 26.0 Ω/km at 20 °C per GB/T 3956 Class 5 pure copper. Rated voltage 300/500 V. Estimated ampacity ≈ 4–6 A in free air at 30 °C. Insulation resistance ≥ 20 MΩ·km. Routine AC withstand test at 2000 V for 5 minutes. Typical capacitance ≈ 130 pF/m at 1 kHz. The pure copper braid provides ≈ 60–70 dB shielding at 30–1000 MHz. Voltage drop at typical sensor current (5 mA) is ≈ 0.13 V per 100 m — negligible for 4–20 mA and 0–10 V signal circuits.

Insulation & Sheath Data

Electrical Parameters

Reference values: RVVP 3×0.75 at 6 A per core, 24 V DC → max load ≈ 144 W​ per core (control/signal use). At 230 V AC → max load ≈ 1,380 VA​ per core (not recommended for power).

4. Thermal & Flame Behaviour

Operating range -15 to +70 °C continuous. Short-circuit withstand up to 160 °C for ≤ 5 seconds. PVC insulation and jacket are flame-retardant per IEC 60332-1. The cable is halogen-containing (PVC), emitting HCl gas on burning — avoid in enclosed switchrooms. For public or enclosed spaces, specify LSZH alternatives. The slim 0.8 mm Type ST jacket is oil-resistant for panel and machine wiring. Note: bare pure copper oxidizes in humid environments — install in dry indoor or conduit-protected locations. UV resistance is limited.

Temperature Characteristics

Fire Performance (RVVP — PVC, Non-Low-Smoke)

5. Installation Practice & Handling

Minimum bending radius ≥ 6×OD ≈ 45 mm for fixed installation; 12×OD ≈ 90 mm for drag-chain applications. The slim 7.5 mm OD and 55 kg/km make the cable easy to route in control panels, through conduits and along sensor runs. When terminating, connect the braid shield to earth at one end (or both ends per system design) using a shield gland or drain wire. Use small ferrules on the 24-strand conductors. Route the cable away from high-power motor cables by at least 200 mm. After installation, verify insulation resistance, shield continuity and 3-wire polarity before energizing.

Mechanical & Installation Parameters

6. Typical Service Applications

3-wire pressure and temperature sensors (power, signal, ground), 4–20 mA transducer interconnection, 0–10 V sensor signal runs, PLC I/O signal wiring, relay and indicator circuits, and interconnection between control panels and field instruments. The 3-core triangular lay-up is specifically designed for 3-wire sensors that require a separate ground wire — a common configuration in industrial automation. Particularly suitable near variable-frequency drives, servo motors and welding equipment, where the braid shield suppresses electromagnetic interference. Not for: mains AC power distribution, high-speed fieldbus, direct burial, or outdoor UV-exposed runs.

7. Testing & Quality Assurance Regime

Routine tests (100% production): DC resistance, AC voltage withstand (2000 V/5 min), insulation resistance, conductor construction, wall thickness, dimensional check, print legibility, mass per length, visual appearance, and packing. Type tests (per batch / material change): shield coverage, heat aging (100 °C/7 days), cold bend (-15 °C), jacket tensile, flame retardancy, and shielding effectiveness. Every coil ships with mill test certificate, ROHS and REACH declarations. The 300/500 V rating uses a lower 2000 V withstand test than 450/750 V cables.

Cable Parameters

Cable Test Parameters

Cable Cross Section Structure

Construction Description

8. Factory Advantages

Pure annealed copper conductor at 24×0.20 mm stranding delivers maximum conductivity with Class 5 flexibility. Slim 0.6 mm insulation and 0.8 mm jacket keep the cable thin and easy to route. Pure copper braid at ≈ 85% coverage provides low transfer impedance for sensitive 4–20 mA signals. 3-core triangular lay-up eliminates the need for a separate ground wire in 3-wire sensor applications. Colour-coded cores prevent wiring errors. 100% routine electrical QA on every reel. Cut-to-length on coils with sealed ends. Lightweight ≈ 55 kg/km for easy handling. Full traceability with MTC and certification support for industrial automation tenders.

9. Packaging, Storage & Logistics

Cut to customer-specified length on export-grade coils, with both ends heat-sealed to prevent moisture ingress. Coils wrapped in waterproof film and corrugated cardboard, labelled with product type, core count, cross-section, length, weight, production date and reel number. Standard lengths 100/200/500/1000 m. Store dry indoor, -10 to +40 °C, below 75% RH, away from direct sunlight and chemical solvents. FOB Shanghai/Nanjing/Qingdao; CIF and DAP available. Sample lead time 5–7 days; bulk production 15–25 days. The light weight makes courier and small-package shipment practical.

10. Procurement Specification

State cable designation "RVVP 3×0.75 pure copper", required length per coil, and core colour preference (e.g. brown/blue/yellow-green for 3-wire sensors). Request the routine AC withstand test record (2000 V) and shield coverage certificate for the specific batch. Note that this is a pure copper (bare) signal-grade variant for dry indoor use — for damp or outdoor applications, specify the tinned copper variant. Specify any regional certification requirements (UL 2464, CE, etc.) at order time. Payment: 30% T/T deposit, balance against B/L copy. Documents: MTC, ROHS/REACH, COO, commercial invoice, packing list.

11. Cable Industry FAQ

Q1: Why 3 cores instead of 2? The 3-core triangular lay-up is designed for 3-wire sensors that need separate power, signal and ground wires — a common industrial automation configuration.

Q2: What sensors use this cable? 3-wire pressure transmitters, temperature sensors, proximity switches, and 4–20 mA transducers that require a dedicated ground wire.

Q3: Can it carry 24 V DC power? Yes — one core can carry 24 V DC sensor power, the second carries the 4–20 mA or 0–10 V signal, and the third is ground.

Q4: What is the voltage rating? 300/500 V, suitable for low-voltage signal and control circuits.

Q5: Why pure copper instead of tinned? Bare pure copper has higher conductivity than tinned copper, ideal for low-level signal circuits where every ohm matters.

Q6: Is it suitable for outdoor use? No — limited UV resistance and bare copper oxidize in humidity. Use indoors or in UV-protected conduits.

Q7: How do you ground the shield? Connect braid to earth at one end (or both ends per system design) using a shield gland or drain wire.

Q8: What is the bending radius? ≥ 6×OD ≈ 45 mm for fixed; 12× for moving applications.

Q9: What is the temperature range? -15 to +70 °C continuous.

Q10: What proof ships? Routine AC test record (2000 V) + shield coverage certificate + MTC.

Q11: When should I choose 2-core instead of 3-core? For 2-wire loop-powered sensors, use RVVP 2×0.75. For 3-wire sensors needing separate ground, use this 3×0.75 version.