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Product

IEC 60584-3 Type JX thermocouple cableIEC 60584-3 / ANSI MC96.1Fe (+) / CuNi (−) True JXClass 1 (±1.5 °C) · ~52 µV/°C

JX / Type J extension Thermocouple CableTrue Fe / CuNi (Type J) Class 1 & Class 2 thermocouple extension cable

Precision Type JX thermocouple extension cable built to IEC 60584-3 and ANSI MC96.1 with true Iron (+ Fe) and Copper-Nickel (− CuNi) conductors, Class 1 (±1.5 °C) EMF tolerance, Al/PET screen and PVC, XLPE/LSZH, FEP/PTFE or SWA construction.

Low-EMC design
EMC screen
Flame-retardant
Oil-resistant
Order designation
JX-PVC-PiMF 4×2×1.0
Outer Ø ≈
12.8 mm
Total weight ≈
208 kg/km
Min. bend R (fixed)
96 mm
Configuration
4×2×1.0 mm² (7/0.43)
All sizes (16)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Alloy pair
Fe (+) / CuNi
Pure Iron (+) / 55Cu45Ni (−)
EMF tolerance
Class 1: ±1.5 °C
±85 µV · Class 2: ±2.5 °C
Loop resistance
≈ 0.59 Ω/m/pair
at 1.0 mm² (0.10 + 0.49 Ω/m)
IEC colour code
+ Black / − Wh
Black outer jacket (or Ex-i Blue)
ANSI colour code
+ White / − Red
Black outer jacket (ASTM E230)
Junction temp.
−25…+200 °C
true JX alloy EMF calibration

Typical values for this cable type, based on IEC 60584-3 / ANSI MC96.1 / ASTM E230 — confirmed in the datasheet and quotation for your order.

Application fit

Is JX / Type J extension right for your machine?

Standard extension cable for Type J (Fe-CuNi) thermocouples on plastics extruders, injection-moulding barrels, packaging heat-sealers, vacuum furnaces and petrochemical process lines.

Fixed installation

Suitable

Supplied in unarmoured PVC, XLPE/LSZH and +200 °C FEP/PTFE for machinery, trays and marshalling cabinets.

TBM gantry & advancing tunnel reel

Suitable

SWA armoured execution (JX-XLPE-SWA / JX-PVC-SWA) provides full direct-burial and crush protection.

Offshore platform & shipboard deck trays

Suitable

Moisture-tight outer sheath prevents oxidation/rusting of the positive Iron (+ Fe) conductor.

Energy chain / drag chain

Not suitable

Iron and CuNi thermocouple alloys are intended for fixed or occasional flexing rather than continuous drag chains.

PUR Drag-Chain Control Cable
Typical machinesPlastics Extrusion & Injection MouldingRubber Vulcanisation & Tyre PressesReducing & Inert-Atmosphere FurnacesRefinery & Chemical Process HeatingPackaging & Food Processing Machinery

Construction

Layer by layer

Shown: JX-PVC-PiMF 4×2×1.0 mm² (IEC 60584-3) with 7-wire stranded Fe (+) and CuNi (−) conductors, Black (+) / White (−) numbered insulation, individual & collective Al/PET screens and Black RAL 9005 outer sheath.

12345
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1True Type JX thermocouple alloy conductorsPositive (+): Thermocouple-grade Iron (Fe, strongly magnetic) · Negative (−): Copper-Nickel (CuNi 55/45, non-magnetic), solid or 7-wire strandedMatches the ~52.6 µV/°C Seebeck slope of Type J sensors across −25 °C to +200 °C
2Colour-coded core insulation105 °C HR-PVC, +90 °C XLPE, or +200/+260 °C FEP/PTFE (IEC: + Black / − White; ANSI: + White / − Red)Protects the Iron positive core against moisture and galvanic oxidation
3Individual & collective Al/PET screensAluminium/PET laminated tape + 0.5 mm² tinned copper drain wire (OS or PiMF+OS)Eliminates heater-band SCR switching noise
4Optional SWA or steel/copper wire braidUnarmoured, galvanised steel wire braid (SY) for extruder barrels, or SWA for underground trenchesTailored mechanical protection
5Outer jacket (Black RAL 9005 or Ex-i Blue)Flame-retardant PVC, Low-Smoke Zero-Halogen (LSZH), or fluoropolymer FEP/PTFEIEC 60332-1-2 / IEC 60332-3-24 flame retardant

JX — IEC 60584-3 (Black/White)

Positive (+) Black, Negative (−) White, Outer Jacket Black (or Blue for Ex-i)

JX — ANSI MC96.1 (White/Red)

Positive (+) White, Negative (−) Red, Outer Jacket Black per ASTM E230

JX-FEP / JX-SWA

+200 °C FEP fluoropolymer for hot extruder zones or SWA armoured for outdoor trenches

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on IEC 60584-3 / ANSI MC96.1 / ASTM E230. Values for your order are confirmed in the datasheet and quotation.

Electrical

Positive conductor (+)
Thermocouple-grade Iron (Fe, strongly magnetic, ~10 µΩ·cm)
Negative conductor (−)
Copper-Nickel (CuNi ~55 % Cu / 45 % Ni, non-magnetic, ~49 µΩ·cm)
Tolerance Class 1 (IEC 60584-3)
±1.5 °C (±85 µV) over −25 °C to +200 °C junction range
Tolerance Class 2 (IEC 60584-3)
±2.5 °C (±140 µV) over −25 °C to +200 °C junction range
Nominal Seebeck coefficient
≈ 52.6 µV/°C (0 to +100 °C) · loop R ≈ 0.59 Ω/m at 1.0 mm²

Thermal

Thermoelectric calibration range
−25 °C to +200 °C (true extension grade JX)
Insulation rating (by jacket type)
−25…+105 °C (HR-PVC) · −40…+90 °C (XLPE/LSZH) · −60…+200 °C (FEP)

Mechanical

Conductor stranding
0.5 mm² (7/0.30) · 1.0 mm² (7/0.43) · 1.5 mm² (7/0.53) or solid
Min. bending radius
7.5 × OD (unarmoured) · 10 × OD (SWA armoured)

Resistance

Flame retardance
IEC 60332-1-2 & IEC 60332-3-24 Cat C
Moisture & oil protection
Hermetic extruded core insulation prevents Iron (+ Fe) rusting

Reference standards

Thermocouple cable standard
IEC 60584-3, ANSI/ISA MC96.1 (ASTM E230) & DIN 43722
Cable construction standard
BS EN 50288-7 / BS 5308

Identification

IEC 60584-3 colour code
(+) Black · (−) White · Outer sheath: Black (or Blue Ex-i)
ANSI MC96.1 colour code
(+) White · (−) Red · Outer sheath: Black
Customs tariff (HS)
8544.49

Sizes

16 standard JX / Type J extension thermocouple cable sizes

Available in 1 to 24 pairs in PVC, XLPE/LSZH, FEP (+200 °C) and SWA armoured constructions.

Dimensions, construction & weights
Order designationConfigurationInsulation / SheathTemp. rangeOuter Ø ≈
mm		Weight ≈
kg/km		Min. bend R
fixed mm		Enquiry
JX Heat-Resistant PVC / PVC Screened (−25…+105 °C)
JX-PVC-OS 1×2×0.51×2×0.5 mm² (7/0.30)PVC / PVC (OS)−25…+105 °C5.64342
JX-PVC-PiMF 2×2×0.52×2×0.5 mm² (7/0.30)PVC / PVC (PiMF+OS)−25…+105 °C8.68264
JX-PVC-PiMF 4×2×0.54×2×0.5 mm² (7/0.30)PVC / PVC (PiMF+OS)−25…+105 °C10.813981
JX-PVC-PiMF 8×2×0.58×2×0.5 mm² (7/0.30)PVC / PVC (PiMF+OS)−25…+105 °C14.1242106
JX-PVC-PiMF 12×2×0.512×2×0.5 mm² (7/0.30)PVC / PVC (PiMF+OS)−25…+105 °C16.9342127
JX-PVC-OS 1×2×1.01×2×1.0 mm² (7/0.43)PVC / PVC (OS)−25…+105 °C6.76650
JX-PVC-PiMF 4×2×1.04×2×1.0 mm² (7/0.43)PVC / PVC (PiMF+OS)−25…+105 °C12.820896
JX-PVC-OS 1×2×1.51×2×1.5 mm² (7/0.53)PVC / PVC (OS)−25…+105 °C7.59056
JX-PVC-PiMF 4×2×1.54×2×1.5 mm² (7/0.53)PVC / PVC (PiMF+OS)−25…+105 °C14.3280107
JX-PVC-PiMF 12×2×1.512×2×1.5 mm² (7/0.53)PVC / PVC (PiMF+OS)−25…+105 °C22.6698170
JX High-Temperature FEP / FEP Screened (−60…+200 °C)
JX-FEP-OS 1×2×0.51×2×0.5 mm² (7/0.30)FEP / FEP (OS)−60…+200 °C4.63734
JX-FEP-PiMF 4×2×0.54×2×0.5 mm² (7/0.30)FEP / FEP (PiMF+OS)−60…+200 °C9.212569
JX-FEP-OS 1×2×1.01×2×1.0 mm² (7/0.43)FEP / FEP (OS)−60…+200 °C5.65742
JX XLPE / LSZH / SWA Armoured Direct-Burial (−40…+90 °C)
JX-XLPE-SWA 1×2×1.51×2×1.5 mm² (7/0.53)XLPE / SWA / LSZH−40…+90 °C12.1294121
JX-XLPE-SWA 4×2×1.54×2×1.5 mm² (7/0.53)XLPE / SWA / LSZH−40…+90 °C19.8738198
JX-XLPE-SWA 8×2×1.58×2×1.5 mm² (7/0.53)XLPE / SWA / LSZH−40…+90 °C25.01,168250
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Specify 'IEC' (+ Black / − White) or 'ANSI' (+ White / − Red) colour coding 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
Thermoelectric EMF calibration test (IEC 60584-3)EMF deviation within Class 1 (±1.5 °C / ±85 µV) at +100 °C / +200 °CEvery alloy melt & production batch
1500 V / 2000 V AC dielectric & polarity test1 min AC withstand test without breakdownEvery manufactured drum

Inspection certificate

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

Product approvals

IEC 60584-3 Class 1 & Class 2 CertifiedANSI/ISA MC96.1 & ASTM E230 CompliantCE, RoHS 2 (2011/65/EU) & REACH

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX JX TYPE J EXTENSION <size> IEC 60584-3 CLASS 1 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

PDFJX / Type J extension Thermocouple Cable – technical datasheet16 sizes · construction, technical data, approvalsXLSXJX / Type J extension spec data (Excel)All 16 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 must care be taken not to confuse IEC 60584-3 and ANSI MC96.1 colour codes on Type JX cable?
Both standards use a White conductor inside a Black outer jacket, but the polarity of the White wire is reversed! Under IEC 60584-3, Positive (+) is Black and Negative (−) is White; under ANSI MC96.1, Positive (+) is White and Negative (−) is Red. Checking with a magnet is foolproof: the Positive (+ Fe) Iron wire is always strongly magnetic.
Why does Type J use a true extension cable (JX) rather than a compensating cable (JC)?
Because Iron (Fe) and Copper-Nickel (CuNi) are already base metals, true thermocouple-grade Fe/CuNi wires are economical enough to use for the entire extension cable run, providing Class 1 (±1.5 °C) accuracy without needing a substitute compensating alloy.
Can KCA (Fe/CuNi compensating cable for Type K) be interchanged with JX (Fe/CuNi extension cable for Type J)?
No! Even though both use an Iron positive leg and a Copper-Nickel negative leg, the CuNi alloy composition in KCA is specially formulated to match the ~40.6 µV/°C slope of Type K, whereas JX uses a 55Cu/45Ni alloy calibrated to the ~52.6 µV/°C slope of Type J.
How should the screen and drain wire of JX / Type J extension 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 JX / Type J extension 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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JX / Type J extension Thermocouple Cable

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