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Product

IEC 60751 Pt100 / Pt1000 RTD cableIEC 60751 Pt100 / Pt10003-Wire Triad & 4-Wire QuadΔR ≤ 0.01 Ω/m Core Balance

RTD Extension CableResistance-matched 3-wire (triad) & 4-wire (quad) Pt100 / Pt1000 RTD extension cable

Precision 3-wire (Rd/Wh/Wh) and 4-wire (Rd/Rd/Wh/Wh) RTD extension and sensor cable built to IEC 60751 and BS EN 50288-7 with resistance-matched tinned, silver-plated (SPC) or nickel-plated (NPC) copper cores for Class AA, A and B Pt100/Pt1000 loops.

Low-EMC design
EMC screen
Flame-retardant
Oil-resistant
Order designation
RTD-PVC-TiMF 4×3×0.75
Outer Ø ≈
13.4 mm
Copper weight
98 kg/km
Total weight ≈
224 kg/km
Min. bend R (fixed)
100 mm
All sizes (17)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Sensor types
Pt100 / Pt1000
also Pt500, Ni100, Cu50 RTDs
Configurations
3-Wire / 4-Wire
1×3 to 24×3 triads · 1×4 quads
Core R balance
ΔR ≤ 0.01 Ω/m
matched within each triad/quad
IEC colour code
Rd/Wh/Wh (3-W)
Rd/Rd/Wh/Wh (4-W) per IEC 60751
Conductors
Cu / TC / SPC
Tinned, Silver- or Nickel-plated
Temp. range
−190…+260 °C
FEP/PTFE · −40…+105 °C PVC/LSZH

Typical values for this cable type, based on IEC 60751 / BS EN 50288-7 / ASTM E1137 — confirmed in the datasheet and quotation for your order.

Application fit

Is RTD Extension Cable right for your machine?

Because a Pt100 sensor changes resistance by only 0.385 Ω/°C, even a 0.1 Ω mismatch between leadwires in a 3-wire bridge causes a 0.26 °C measurement error. Our RTD extension cables draw all three or four cores from the same copper lot with matched lay length.

Fixed installation

Suitable

Supplied in process PVC, XLPE/LSZH, cleanroom/autoclave FEP/PTFE (−190…+260 °C) and SWA armoured multi-triad trunks.

TBM gantry & advancing tunnel reel

Suitable

SWA armoured execution (RTD-XLPE-SWA) protects underground refinery, LNG and tank-farm Pt100 multi-triad trunks.

Offshore platform & shipboard deck trays

Suitable

UV-stabilised outer sheaths and tinned/silver-plated copper conductors resist moisture and oxidation.

Energy chain / drag chain

With conditions

Class 5 stranded SPC/FEP and PUR sensor leads support moderate flexing; fixed process triads use Class 2 stranding.

Typical machinesPharmaceutical Autoclaves, Cleanrooms & BioreactorsOil, Gas, LNG & Custody-Transfer MeteringChemical, Food & Beverage Process ControlTurbine Bearing, Stator & Transformer Winding RTDsHVAC, Cold Storage & Laboratory Metrology

Construction

Layer by layer

Shown: RTD-PVC-TiMF 4×3×0.75 mm² with resistance-matched tinned copper triads (Red / White / White), individual & collective Al/PET screens and Grey RAL 7001 (or Ex-i Blue) outer sheath.

12345
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Resistance-matched copper conductorsTinned copper (TC up to +105 °C), Silver-plated copper (SPC up to +200 °C) or Nickel-plated copper (NPC up to +260 °C), drawn from a single wire lotMaintains core-to-core DC resistance balance ΔR ≤ 0.01 Ω/m so 3-wire bridge compensation remains accurate
2Precision concentric core insulationPVC, XLPE, FEP (−190…+200 °C) or PTFE (−190…+260 °C) in IEC 60751 Red/White/White (3-wire) or Red/Red/White/White (4-wire)High insulation resistance (> 1000 MΩ·km on XLPE/FEP) prevents parallel shunt error across Pt100/Pt1000 elements
3Al/PET foil and/or SPC wire braid screen100 % Al/PET tape + drain wire (OS / TiMF+OS) or ≥ 85 % silver-plated copper braid on FEP/PTFE sensor leadsEliminates 50/60 Hz and VFD common-mode pick-up on low-level excitation currents (0.1–1.0 mA)
4Optional SWA armourUnarmoured or Galvanised Steel Wire Armour (SWA) on multi-triad process trunksMechanical crush protection in refineries and tank farms
5Outer jacket (Grey, Black, White or Ex-i Blue)Flame-retardant PVC, Low-Smoke Zero-Halogen (LSZH), FEP or PTFEIEC 60332-1-2 / IEC 60332-3-24 flame retardant

3-Wire Triad — IEC 60751 (Rd/Wh/Wh)

1 Red + 2 White cores (or EN 50288-7 Black/White/Red numbered triads) for industrial 3-wire Pt100 bridges

4-Wire Quad — IEC 60751 (Rd/Rd/Wh/Wh)

2 Red + 2 White cores in star-quad lay for Class AA / custody-transfer 4-wire Kelvin Pt100 loops

SPC / FEP Sensor Lead (−190…+200 °C)

Silver-plated copper + FEP insulation + SPC braid + FEP jacket for direct RTD probe termination

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on IEC 60751 / BS EN 50288-7 / ASTM E1137. Values for your order are confirmed in the datasheet and quotation.

Electrical

Supported RTD standards
IEC 60751 / ASTM E1137 (Pt100, Pt500, Pt1000, α = 0.00385 °C⁻¹)
Core-to-core DC resistance balance
ΔR ≤ 0.01 Ω/m within any triad/quad (≤ 1 % of conductor R₂₀)
Max. conductor DC resistance @ 20 °C
36.7 (0.5) · 25.0 (0.75) · 18.5 (1.0) · 12.3 Ω/km (1.5 mm²)
Insulation resistance @ 20 °C
≥ 100 MΩ·km (PVC) · ≥ 5000 MΩ·km (XLPE / FEP / PTFE)
Operating voltage rating
300/500 V (process PVC/XLPE) · 300 V (FEP/PTFE sensor leads)

Thermal

Operating temperature (PVC / XLPE-LSZH)
−30 °C to +105 °C (HR-PVC) · −40 °C to +90 °C (XLPE/LSZH)
Operating temp. (SPC-FEP / NPC-PTFE)
−190 °C to +200 °C (SPC/FEP) · −190 °C to +260 °C (NPC/PTFE)

Mechanical

Conductor stranding
Class 5 flexible (19-wire SPC/NPC or 24/32-wire TC) or Class 2 (7-wire)
Min. bending radius
7.5 × OD (unarmoured) · 10 × OD (SWA armoured)

Resistance

Flame retardance
IEC 60332-1-2 & IEC 60332-3-24 Cat C (UL 94 V-0 on FEP/PTFE)
Chemical & steam resistance
FEP/PTFE grades impervious to CIP/SIP steam, oils and solvents

Reference standards

RTD & cable standards
IEC 60751, ASTM E1137 & BS EN 50288-7
Hazardous area compatibility
Suitable for Ex-i intrinsic safety loops (IEC 60079-14) with Blue sheath

Identification

IEC 60751 core colours
3-wire: Red / White / White · 4-wire: Red / Red / White / White
EN 50288-7 multi-triad colours
Black / White / Red numbered 1, 2, 3…
Customs tariff (HS)
8544.49

Sizes

17 standard 3-wire & 4-wire RTD extension cable sizes

Includes PVC process triads/quads, −190…+260 °C SPC/FEP & NPC/PTFE sensor leads, and SWA armoured trunks.

Dimensions, construction & weights
Order designationConfigurationInsulation / Screen / SheathTemp. rangeOuter Ø ≈
mm		Copper
kg/km		Weight ≈
kg/km		Min. bend R
fixed mm		Enquiry
Tinned Copper / PVC Screened 3-Wire & 4-Wire Process Cables (−30…+105 °C)
RTD-PVC-OS 1×3×0.51 Triad (3-wire) × 0.5 mm²PVC / PVC (OS)−30…+105 °C5.9175044
RTD-PVC-OS 1×4×0.51 Quad (4-wire) × 0.5 mm²PVC / PVC (OS)−30…+105 °C6.4225848
RTD-PVC-OS 1×3×0.751 Triad (3-wire) × 0.75 mm²PVC / PVC (OS)−30…+105 °C6.4246248
RTD-PVC-OS 1×4×0.751 Quad (4-wire) × 0.75 mm²PVC / PVC (OS)−30…+105 °C7.0317452
RTD-PVC-TiMF 4×3×0.754 Triads (3-wire) × 0.75 mm²PVC / PVC (TiMF+OS)−30…+105 °C13.498224100
RTD-PVC-TiMF 8×3×0.758 Triads (3-wire) × 0.75 mm²PVC / PVC (TiMF+OS)−30…+105 °C17.8192396134
RTD-PVC-TiMF 12×3×0.7512 Triads (3-wire) × 0.75 mm²PVC / PVC (TiMF+OS)−30…+105 °C21.4286568160
RTD-PVC-OS 1×3×1.01 Triad (3-wire) × 1.0 mm²PVC / PVC (OS)−30…+105 °C6.8317451
RTD-PVC-TiMF 4×3×1.04 Triads (3-wire) × 1.0 mm²PVC / PVC (TiMF+OS)−30…+105 °C14.2128268106
RTD-PVC-OS 1×3×1.51 Triad (3-wire) × 1.5 mm²PVC / PVC (OS)−30…+105 °C7.6469857
Silver/Nickel-Plated Copper / FEP & PTFE Probe & Autoclave Leads (−190…+260 °C)
RTD-SPC-FEP 1×3×0.221 Triad (3-wire) × 0.22 mm² SPCFEP / SPC Braid / FEP−190…+200 °C3.4112426
RTD-SPC-FEP 1×4×0.221 Quad (4-wire) × 0.22 mm² SPCFEP / SPC Braid / FEP−190…+200 °C3.7142928
RTD-SPC-FEP 1×3×0.51 Triad (3-wire) × 0.5 mm² SPCFEP / SPC Braid / FEP−190…+200 °C4.5204434
RTD-SPC-FEP 1×4×0.51 Quad (4-wire) × 0.5 mm² SPCFEP / SPC Braid / FEP−190…+200 °C4.9255237
RTD-NPC-PTFE 1×3×0.51 Triad (3-wire) × 0.5 mm² NPCPTFE / NPC Braid / PTFE−190…+260 °C4.6204634
XLPE / LSZH / SWA Armoured Multi-Triad Refinery Trunks (−40…+90 °C)
RTD-XLPE-SWA 1×3×1.51 Triad (3-wire) × 1.5 mm²XLPE / SWA / LSZH−40…+90 °C12.246305122
RTD-XLPE-SWA 4×3×1.54 Triads (3-wire) × 1.5 mm²XLPE / SWA / LSZH−40…+90 °C20.6182815206
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Specify IEC 60751 (Red/White/White) or EN 50288-7 (Black/White/Red) core colours when ordering.

Quality & approvals

Testing & inspection

Routine tests on every production length, sample and type tests per batch — documented on an EN 10204 3.1 inspection certificate.

  1. ConductorClass 5 stranding
  2. Spark test100 % in-line
  3. Lay-upCores, earth, fillers
  4. SheathingInner, braid / screen, outer
  5. Electrical testsAC voltage, resistance
  6. DimensionsOD, wall thickness
  7. Inspection documents & dispatchDrum & dispatch
Testing & inspectionTest value / referenceFrequency
Routine tests
Core-to-core DC resistance balance & continuity testR₂₀ per IEC 60228 and ΔR ≤ 0.01 Ω/m between cores of each triad/quadEvery manufactured drum
1500 V / 2000 V AC dielectric withstand test1 min AC test without breakdown; IR ≥ 100 MΩ·km (PVC) or ≥ 5000 MΩ·km (XLPE/FEP)Every manufactured drum

Inspection certificate

Issued with every drum, listing the routine test results for that length.

Product approvals

IEC 60751 & ASTM E1137 RTD CompatibleBS EN 50288-7 & IEC 60332-3-24 Cat CCE, RoHS 2 (2011/65/EU) & REACH

Company certificates

ISO 9001ISO 14001ISO 45001VDE marks approvalUL / cULCE · LVD / EMC

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX RTD EXTENSION CABLE <size> IEC 60751 EN 50288-7 CE
Delivery form
Non-returnable fumigated wooden drums
Standard lengths
500 m · 1000 m standard drums (cut lengths on request)
MOQ
500 m (stock sizes) · 1000 m (custom)
Lead time
2–4 weeks ex-works
Incoterms
EXW, FCA, FOB, CIF, DAP

Technical documents

Downloads

PDFRTD Extension Cable – technical datasheet17 sizes · construction, technical data, approvalsXLSXRTD Extension Cable spec data (Excel)All 17 sizes with dimensions and data, for your BOM or quotation
Revision
2026-10-20
Updated
2026-10-20

FAQ

Questions engineers ask first

Not covered here? Send your drawing — an engineer replies within 2 business hours.

Why does an RTD use copper extension cable whereas a thermocouple requires special alloy cable?
A thermocouple generates a microvolt Seebeck voltage along the temperature gradient of the wires, so its extension cable must replicate the thermocouple alloys. An RTD (such as a Pt100 or Pt1000) is a passive platinum resistor measured by passing a small constant excitation current through the leads. Therefore, RTDs require high-conductivity, low-resistance, resistance-balanced Copper (or Silver/Nickel-plated Copper) cores rather than thermocouple alloys.
When should I specify 4-wire (quad) instead of 3-wire (triad) RTD cable?
A 3-wire triad compensates for lead resistance assuming all three wires have identical resistance, which is sufficient for Class B (±0.30 °C) and standard Class A (±0.15 °C) process loops. For Class AA (±0.10 °C), fiscal custody-transfer metering, pharmaceutical validation, or long cable runs with terminal junctions, specify a 4-wire quad (Red/Red/White/White) so the transmitter measures voltage drop directly across the Pt100 element with zero leadwire resistance error.
Why are Silver-Plated Copper (SPC) or Nickel-Plated Copper (NPC) conductors used in FEP/PTFE RTD cables?
Standard tin plating melts and diffuses into copper during high-temperature fluoropolymer extrusion (~380 °C) and oxidises above +150 °C. Silver-plated copper (SPC) operates continuously to +200 °C with lower contact resistance, while Nickel-plated copper (NPC) operates continuously to +260 °C.
How should the screen and drain wire of RTD Extension Cable be earthed in instrumentation and Ex-i loops?
To prevent circulating 50/60 Hz ground-loop currents from coupling into millivolt or 4–20 mA signals, the Al/PET screen and tinned copper drain wire of RTD Extension Cable should be bonded to the clean instrumentation earth bar at one end only (typically in the control/marshalling cabinet) and insulated against chassis contact at the field transmitter or junction box, in accordance with IEC 60079-14 and EN 50288-7.

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RTD Extension Cable

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