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Product

High-temperature wireISO 3808 Class F / SAE J2031Inductive Ferrite EMI Core25–40 kV DC · +220 °C

Wire-Wound Suppression Ignition CableISO 3808 Class F / SAE J2031 ferrite-core wire-wound EMI suppression ignition cable

Inductive wire-wound EMI/RFI suppression HV ignition cable with an aramid/glass cord, magnetic ferrite core, helical CuNi44/SS304L resistance wire (0.5–5.6 kΩ/m), E-glass braid, and a +220 °C (+250 °C peak) silicone jacket (7, 8, 8.5 mm OD).

Low-EMC design
Flame-retardant
Oil-resistant
Ozone, UV & moisture
Order designation
WWSI-7.0-2K2 (7 mm · 2.2 kΩ/m)
Outer Ø ≈
7.00 mm
Wall thickness
2.55 mm
Total weight ≈
59.0 kg/km
Min. bend R (fixed)
42 mm
All sizes (9)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Pulse voltage
25 to 40 kV DC
35–45 kV dielectric breakdown
Temperature
-50…+220 °C
ISO 3808 Cl. F · +250 °C peak
Suppression core
Ferrite + spiral
CuNi44 / SS304L on ferrite core
DC resistance
0.5–5.6 kΩ/m
Calibrated inductive damping
Standard ODs
7.0, 8.0, 8.5 mm
Fits SAE & DIN ignition boots
EMI compliance
CISPR 12 / SAE
Broadband RFI noise damping

Typical values for this cable type, based on ISO 3808 Class F / SAE J2031 Type 3 Inductive EMI Suppression Ignition Cable — confirmed in the datasheet and quotation for your order.

Application fit

Is Wire-Wound Suppression Ignition Cable right for your machine?

Select Wire-Wound Suppression Ignition Cable when high-energy spark ignition systems run near PLC controllers, engine ECUs, CAN-bus networks, or flame sensors that would be disrupted by broadband spark RFI.

Furnace, kiln & high-temp zone

Suitable

ISO 3808 Class F silicone sheath and EPDM/VMQ dielectric operate continuously from -50 °C to +220 °C (+250 °C peak).

Switchgear & control cabinet wiring

Suitable

Helical alloy wire over a ferromagnetic ferrite core forms a distributed inductor that chokes MHz spark ringing.

Fixed installation

Suitable

Aramid/glass tensile core and E-glass reinforcement braid provide ≥ 250 N pull-off strength for spark plug and igniter boot assembly.

Motorised monospiral reel

Not suitable

Designed for fixed and engine-mounted high-voltage ignition harnesses, not power reeling drums.

Use NSHTÖU for drum reeling
Typical machinesCHP Gas Engines & Biogas GensetsPLC-Controlled Industrial BurnersMarine & Stationary Gas EnginesAutomotive & Heavy-Duty IgnitionFlame-Supervised Boiler Skids

Construction

Layer by layer

6-layer ISO 3808 Class F inductive suppression construction: aramid/glass core, magnetic ferrite layer, helical CuNi44/SS304L winding, HV dielectric, glass braid, and VMQ jacket.

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Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Aramid/glass core + ferrite + helical wireHigh-tensile aramid/E-glass centre cord coated with ferromagnetic ferrite elastomer and helically wound with CuNi44 or SS304L wire (40–100 turns/cm)Acts as a distributed inductive choke (0.5 to 5.6 kΩ/m) that suppresses 30–1000 MHz spark EMI without burning out like carbon cores
2Conductive stress-control coatingSemi-conductive elastomer encapsulation over the helical resistance windingEqualises radial electric field stress across the microscopic wire turns to prevent internal corona
3High-voltage EPDM / VMQ inner dielectricExtruded high-dielectric-strength EPDM or methyl-vinyl silicone rubber (VMQ) primary insulationWithstands 25 kV to 40 kV DC ignition pulses and 35–45 kV breakdown tests
4Fibreglass mechanical reinforcement braidOpen-weave high-tenacity E-glass yarn reinforcement between inner dielectric and outer jacketBonds the inner and outer layers together and prevents jacket stripping failure during boot removal
5ISO 3808 Class F silicone outer sheathOil-, fuel-, ozone-, and heat-resistant VMQ silicone rubber outer jacket (7.0 mm, 8.0 mm, or 8.5 mm OD)Seals tightly into SAE/DIN spark boots and operates from -50 °C to +220 °C (+250 °C peak)

7.0 mm ISO 3808 Class F (2.2 or 5.6 kΩ/m)

Standard 7.0 mm OD inductive suppression cable for industrial gas engines, CHP gensets, and burners

8.0 mm / 8.5 mm Heavy-Duty (0.5 or 1.5 kΩ/m)

Low-resistance 500–1500 Ω/m heavy-wall 8.0/8.5 mm cable for high-compression biogas engines and CD igniters

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on ISO 3808 Class F / SAE J2031 Type 3 Inductive EMI Suppression Ignition Cable. Values for your order are confirmed in the datasheet and quotation.

Electrical

Nominal ignition pulse voltage
25 kV to 40 kV DC peak
Dielectric breakdown voltage
≥ 35 kV AC rms / ≥ 45 kV DC (per ISO 3808)
Calibrated linear resistance
500 Ω/m · 1.5 kΩ/m · 2.2 kΩ/m · 5.6 kΩ/m (±20 %)
Series inductance (1 MHz)
approx. 8 to 22 µH/m (ferrite core)
Lead capacitance
≤ 115 pF/m per ISO 3808

Thermal

ISO 3808 Class F temperature
-50 °C to +220 °C continuous
Short-term radiant peak
+250 °C (up to +260 °C near exhaust manifolds)
Thermal overload resistance
Wire-wound core resists carbon-track burnout

Mechanical

Calibrated outer diameters
7.0 mm (±0.3 mm) · 8.0 mm (±0.3 mm) · 8.5 mm
Core Diameter (ferrite + wire)
1.8 mm to 2.3 mm (fits crimp terminals)
Tensile pull strength
≥ 250 N (aramid/glass centre cord)

Resistance

EMI / RFI attenuation
Complies with CISPR 12 & UN ECE R10
Oil, fuel & salt-water test
ISO 3808 fluid immersion & saltwater bath pass
Corona & ozone resistance
Zero cracking after 48 h at 50 pphm ozone

Reference standards

International ignition standard
ISO 3808 Class F Type B/C (wire-wound)
North American standard
SAE J2031 Type 3 Class E/F
RoHS & REACH
RoHS 3 & REACH compliant

Identification

Standard sheath colours
Red-brown, black, blue, yellow, orange
Surface legend
TEBAOFLEX ISO 3808 CLASS F INDUCTIVE SUPPRESSION
Customs tariff (HS)
8544.30 / 8544.49

Sizes

9 standard configurations (Wire-Wound Suppression Ignition Cable)

Engineering dimensions, conductor stranding, mass and electrical ratings for Wire-Wound Suppression Ignition Cable per ISO 3808 Class F / SAE J2031 Type 3 Inductive EMI Suppression Ignition Cable.

Dimensions & weights
Order designationCross-section / sizeConductor buildWall ≈
mm		Outer Ø ≈
mm		Metal
kg/km		Weight ≈
kg/km		Min. bend R
fixed mm		Enquiry
Standard Wire-Wound Suppression Ignition Cable configurations
WWSI-7.0-5K6 (7 mm · 5.6 kΩ/m)Ø 7.0 mm (5.6 kΩ/m)CuNi44 on ferrite core2.557.0012.058.042
WWSI-7.0-2K2 (7 mm · 2.2 kΩ/m)Ø 7.0 mm (2.2 kΩ/m)CuNi44 on ferrite core2.557.0013.059.042
WWSI-7.0-1K0 (7 mm · 1.0 kΩ/m)Ø 7.0 mm (1.0 kΩ/m)CuNi44 on ferrite core2.507.0014.060.042
WWSI-7.0-500R (7 mm · 500 Ω/m)Ø 7.0 mm (500 Ω/m)CuNi44 on ferrite core2.507.0015.061.042
WWSI-8.0-5K6 (8 mm · 5.6 kΩ/m)Ø 8.0 mm (5.6 kΩ/m)CuNi44 on ferrite core3.008.0014.074.048
WWSI-8.0-2K2 (8 mm · 2.2 kΩ/m)Ø 8.0 mm (2.2 kΩ/m)CuNi44 on ferrite core3.008.0015.075.048
WWSI-8.0-1K5 (8 mm · 1.5 kΩ/m)Ø 8.0 mm (1.5 kΩ/m)CuNi44 on ferrite core2.958.0016.076.048
WWSI-8.0-500R (8 mm · 500 Ω/m)Ø 8.0 mm (500 Ω/m)CuNi44 on ferrite core2.958.0017.077.048
WWSI-8.5-500R (8.5 mm · 500 Ω/m)Ø 8.5 mm (500 Ω/m)CuNi44 on ferrite core3.158.5018.086.051
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Outer diameters and weights are nominal engineering values for Wire-Wound Suppression Ignition Cable subject to standard manufacturing tolerances per ISO 3808 Class F / SAE J2031 Type 3 Inductive EMI Suppression Ignition Cable.

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
Dielectric spark / high-voltage withstand test100 % in-line spark and AC/DC dielectric withstand per ISO 3808 Class F / SAE J2031 Type 3 Inductive EMI Suppression Ignition CableEvery manufactured length
Conductor DC resistance & continuity checkWithin maximum 20 °C resistance limit specified for Wire-Wound Suppression Ignition CableEvery spool or drum length
Sample tests
Thermal ageing & dimensional verificationWall thickness, concentricity and post-ageing elongation per ISO 3808 Class F / SAE J2031 Type 3 Inductive EMI Suppression Ignition CablePer production batch
Flame, outgassing or high-temperature enduranceQualified to ISO 3808 Class F / SAE J2031 Type 3 Inductive EMI Suppression Ignition Cable thermal and environmental performance criteriaType qualification

Inspection certificate

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

Product approvals

ISO 3808 Class F / SAE J2031 Type 3 Inductive EMI Suppression Ignition CableCE (2014/35/EU) & RoHS 3 (2015/863/EU) CompliantREACH SVHC & Halogen/Asbestos Compliance Verified

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX ISO 3808 CLASS F 7.0MM WIRE-WOUND FERRO-CORE SUPPRESSION
Delivery form
Precision spools, coils or export wooden drums
Standard lengths
50 m · 100 m · 500 m · 1000 m (or cut harnesses)
MOQ
100 m (stock sizes) · 300–500 m (custom build)
Lead time
2–4 weeks ex-works
Incoterms
EXW, FOB, CIF, DAP

Technical documents

Downloads

PDFWire-Wound Suppression Ignition Cable – technical datasheet9 sizes · construction, technical data, approvalsXLSXWire-Wound Suppression Ignition Cable spec data (Excel)All 9 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.

How does a wire-wound ferrite-core suppression ignition cable differ from a carbon-impregnated resistive core?
Carbon-impregnated textile cores rely purely on high ohmic resistance (10–25 kΩ/m) and gradually burn away under continuous high-energy spark pulses. A wire-wound ferrite-core cable winds a metallic CuNi44 or stainless-steel alloy wire around a magnetic ferrite elastomer core — creating a reactive inductive choke that blocks MHz radio interference while maintaining a much lower, stable DC resistance (0.5–5.6 kΩ/m).
How do I choose between 5.6 kΩ/m, 2.2 kΩ/m, and 500 Ω/m linear resistance?
Choose 5.6 kΩ/m for standard ISO 3808 unshielded leads that do not use resistor boots, 2.2 kΩ/m for industrial CHP gas engines paired with 1 kΩ or 5 kΩ resistor spark plug boots, and 500 Ω/m (0.5 kΩ/m) for capacitive-discharge (CD) igniters and lean-burn biogas engines needing maximum spark energy.
How should crimp terminals be attached to a wire-wound ferrite suppression core?
Strip approximately 12–15 mm of the outer silicone jacket, glass braid, and inner dielectric to expose the wire-wound ferrite core, fold the exposed ferrite/wire core back 180° against the outer silicone jacket, and crimp a brass or stainless-steel ignition terminal over the jacket so the folded core presses firmly against the inside of the terminal barrel.
Can this cable replace metallic-core Silicone High-Voltage Ignition Cable on PLC-controlled industrial burners?
Yes. Switching from a plain copper-core ignition lead to an inductive wire-wound ferrite suppression cable eliminates high-frequency electromagnetic transients that cause false trips or resets on nearby PLCs, flame safeguards, and 4–20 mA transmitters.

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Wire-Wound Suppression Ignition Cable

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