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Product

AS-Interface, ISOBUS & KNX Building Bus CablesEN 50090 · KNX TP1 Certified2×2×0.8 mm Star-Quad · ≤73.2 Ω/km4.0 kV AC Test · PVC & LSZH Cca

KNX / EIB KNX/EIB Building Automation CableEN 50090 / VDE 0815 2×2×0.8 mm (Red/Black + White/Yellow) 4 kV test-voltage KNX / EIB

KNX / EIB Building Automation Cable is the KNX Association certified TP1 (Twisted Pair 1, 9600 bps SELV) installation cable in J-Y(St)Y 2×2×0.8 mm (PVC) and J-H(St)H 2×2×0.8 mm (LSZH halogen-free) Star-Quad constructions, featuring Ø 0.80 mm solid bare

Low-EMC design
EMC screen
Flame-retardant
Approved
Order designation
KNX J-H(St)H 2×2×0.8 mm Green LSZH (CPR Cca)
Outer Ø ≈
6.3 mm
Copper weight
21 kg/km
Total weight ≈
56 kg/km
Min. bend R (fixed)
50 mm
All sizes (5)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Construction
2 × 2 × 0.8 mm
Solid bare Cu Star-Quad (0.50 mm²)
HV test voltage
4.0 kV AC
Outer sheath tested per EN 50090
Loop resistance
≤ 73.2 Ω / km
≤ 36.6 Ω/km per conductor @ 20 °C
Capacitance
≤ 100 pF / m
≈ 65–75 pF/m at 800 Hz
Max. line length
1,000 m / line
350 m power-to-device · 700 m node-node
CPR fire class
Eca / Cca / B2ca
J-Y(St)Y PVC & J-H(St)H LSZH

Typical values for this cable type, based on EN 50090 / ISO/IEC 14543-3 (KNX TP1 / VDE 0815) — confirmed in the datasheet and quotation for your order.

Application fit

Is KNX / EIB right for your machine?

Engineered for smart commercial buildings, hospitals, airports, hotels, tunnels, and residential automation linking KNX pushbuttons, HVAC controllers, DALI gateways, blind actuators, and energy

Fixed installation

Suitable

4.0 kV AC tested green sheath permits direct installation alongside 230/400 V AC NYM power cables in walls and trays.

Switchgear & control cabinet wiring

Suitable

Ø 0.80 mm solid copper cores push directly into standard WAGO 243 Red/Black and Yellow/White KNX bus terminals.

Immersion & wet locations

With conditions

Use the Black PE / double-sheathed J-Y(St)Y2Y variant for outdoor or underground runs between buildings.

PROFIBUS DP

Energy chain / drag chain

Not suitable

Solid Ø 0.80 mm installation cable for fixed building conduits and trays only.

CAN bus cable
Typical machinesCommercial office & hotel automationHospitals, airports & public buildingsHVAC, lighting (DALI) & blind controlSmart metering & building BMS

Construction

Layer by layer

Four Ø 0.80 mm solid annealed bare copper conductors insulated in Red (KNX+), Black (KNX-), White (Aux+), and Yellow (Aux-) twisted in a

1234
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Solid bare copper conductors (Ø 0.80 mm)Ø 0.80 mm (0.50 mm², approx. 20 AWG) solid annealed copper per VDE 0815 / EN 50090DIN VDE 0815 / KNX Vol. 9
2Core insulation (PVC or Halogen-Free)2YI1 polyolefin / PVC insulation in Red (+), Black (-), White, and Yellow laid inVDE 0815
3Static screen (Al/PET + 0.4 mm drain)Plastic separator tape + Ø 0.40 mm solid tinned copper drain wire + aluminium-laminatedJ-Y(St)Y / J-H(St)H
44 kV tested outer sheath (RAL 6018Flame-retardant PVC (J-Y(St)Y) or halogen-free LSZH (J-H(St)H, CPR Cca/B2ca) tested atEN 50090 / EN 50575

J-Y(St)Y 2×2×0.8 EIB/KNX Green PVC (CPR Eca)

Standard 4 kV tested green PVC KNX TP1 bus cable for general residential and commercial buildings.

J-H(St)H 2×2×0.8 EIB/KNX Green LSZH (CPR Cca / B2ca)

Low-smoke zero-halogen KNX TP1 bus cable for hospitals, airports, schools, and escape routes.

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on EN 50090 / ISO/IEC 14543-3 (KNX TP1 / VDE 0815). Values for your order are confirmed in the datasheet and quotation.

Electrical

Characteristic impedance @ 100 kHz
≈ 100 Ω (KNX TP1 9600 bps base-band bus)
Max. DC loop resistance @ 20 °C
≤ 73.2 Ω/km (≤ 36.6 Ω/km per conductor)
Mutual capacitance @ 800 Hz
≤ 100 nF/km (typical 65–75 pF/m)
Insulation resistance @ 20 °C
≥ 100 MΩ·km
High-voltage dielectric test
4.0 kV AC (outer sheath test per EN 50090)
Bus operating voltage
29–30 V DC SELV (300 V peak rating)

Thermal

Operating temp. (fixed)
-30 °C to +70 °C
Installation temperature
-5 °C to +50 °C

Mechanical

Nominal outer diameter
6.2 mm ± 0.3 mm (2×2×0.8 mm)
Min. bending radius
7.5 × D fixed · 12.5 × D during pulling

Resistance

Flame retardancy & CPR
IEC 60332-1-2 (Eca) · EN 50399 Cca-s1,d1,a1
Halogen-free & low smoke (J-H(St)H)
IEC 60754-1/2 · IEC 61034-2

Reference standards

Primary specification
EN 50090-2-2 · ISO/IEC 14543-3 · KNX
KNX certification
KNX TP1 certified geometry & electrical

Identification

Pair 1 (KNX TP1 Bus)
Red (KNX +) · Black (KNX -)
Pair 2 (Auxiliary / Free)
White (+24/30 V aux) · Yellow (0 V aux)

Sizes

5 standard configurations (KNX / EIB)

Nominal dimensions, copper weights, impedance and transmission parameters for KNX / EIB per EN 50090 / ISO/IEC 14543-3 (KNX TP1 / VDE 0815).

Dimensions & weights
Order designationConfigurationConductor sizeOuter Ø ≈
mm		Copper
kg/km		Weight ≈
kg/km		Min. bend R
fixed mm		Enquiry
Standard KNX / EIB configurations
KNX J-Y(St)Y 2×2×0.8 mm Green PVC (CPR Eca)2×2×0.8 mm (PVC Green Eca)Ø 0.80 mm (0.50 mm²)6.2215350
KNX J-H(St)H 2×2×0.8 mm Green LSZH (CPR Cca)2×2×0.8 mm (LSZH Green Cca)Ø 0.80 mm (0.50 mm²)6.3215650
KNX J-H(St)H 2×2×0.8 mm Green LSZH (CPR B2ca)2×2×0.8 mm (LSZH Green B2ca)Ø 0.80 mm (0.50 mm²)6.5216052
KNX J-Y(St)Y 1×2×0.8 mm Compact Green PVC1×2×0.8 mm (1-Pair Compact)Ø 0.80 mm (0.50 mm²)5.4113843
KNX J-Y(St)Y2Y 2×2×0.8 mm Underground Black PE2×2×0.8 mm (Underground PE)Ø 0.80 mm (0.50 mm²)7.8217462
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Outer diameters and weights are nominal factory values subject to ±5 % manufacturing tolerance per EN 50090 / ISO/IEC 14543-3 (KNX TP1 / VDE 0815).

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
4.0 kV AC outer-sheath spark / water-bath test4,000 V AC without breakdown per EN 50090 / KNX Vol. 9100 % of length
DC loop resistance & mutual capacitance @ 800 Hz≤ 73.2 Ω/km; ≤ 100 nF/km100 % of reels
Sample tests
Core-to-core & core-to-screen 2.5 kV dielectric2.5 kV AC for 1 minutePer production batch
EN 50575 CPR fire classification (Eca / Cca / B2ca)EN 60332-1-2 & EN 50399 heat/smoke releaseNotified body DoP

Inspection certificate

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

Product approvals

KNX Association CertifiedEN 50090 / ISO/IEC 14543-3EN 50575 CPR Eca / Cca / B2ca

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX KNX / EIB BUS CABLE J-Y(St)Y
Delivery form
Non-returnable plywood reels or export drums
Standard reel lengths
100 m · 305 m · 500 m · 1000 m
MOQ
100 m (stock variants) · 500 m (custom)
Lead time
2–3 weeks ex-works
Incoterms
EXW, FOB, CIF, DAP

Technical documents

Downloads

PDFKNX / EIB KNX/EIB Building Automation Cable – technical datasheet5 sizes · construction, technical data, approvalsXLSXKNX / EIB spec data (Excel)All 5 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 cannot a standard J-Y(St)Y 2×2×0.8 telephone cable be used as a KNX bus cable?
Standard grey telephone cables are only tested at 800 V AC. Because KNX is a SELV (Safety Extra-Low Voltage) bus routed directly inside distribution boards and wall conduits alongside 230/400 V AC mains cables, EN 50090 requires the green KNX outer sheath to pass a 4.0 kV AC dielectric test to guarantee basic insulation separation.
What are the two pairs (Red/Black and White/Yellow) used for in a 2×2×0.8 KNX cable?
The Red (+) and Black (-) pair carries the 29–30 V DC SELV bus power and 9600 bps KNX TP1 telegrams via Red/Black push-wire terminals. The White and Yellow pair provides an auxiliary 24/30 V DC supply for high-consumption room touch panels or serves as a spare pair.
Should the Al/PET foil screen and drain wire of a KNX cable be earthed?
No. Per KNX installation rules (Volume 5), the static Al/PET foil and 0.4 mm tinned drain wire act as an electrostatic capacitive balancing screen and must NOT be connected to protective earth (PE), avoiding 50 Hz building ground loops. Each production reel undergoes 100 % characteristic impedance verification, mutual capacitance and DC loop resistance testing, and dielectric spark/withstand inspection before dispatch with an EN 10204 3.1 certificate.
What are the maximum cable length rules for a single KNX TP1 line segment?
A single KNX TP1 line segment using 2×2×0.8 mm cable (≤ 73.2 Ω/km loop resistance, ≤ 100 nF/km) supports up to 1,000 m total installed cable length, up to 350 m between the KNX choke power supply and any bus device, and up to 700 m between any two communicating devices.

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KNX / EIB KNX/EIB Building Automation Cable

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