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Product

15 kV DC repeatered transoceanic submarine optical telecom cableITU-T G.978 / UJC SL1715,000 V DC (1.00 Ω/km)24-Wire Pressure Vault

SL17 (SL17-LW / SL17-LWA / SL17-DA) 15 kV DC Undersea Telecom CableITU-T G.978 / UJC SL17 · 12/20 kV · 15 kv dc repeatered transoceanic submarine optical

SL17 (SL17-LW / SL17-LWA / SL17-DA) 15 kV DC Undersea Telecom Cable (ITU-T G.978 / UJC Qualified 15 kV DC Transoceanic SL17) engineered for 12/20 kV service across -10 °C to +60 °C (min. bend radius 20 × OD).

Water-resistant

EMC screen

Outdoor & humid

Approved

Configuration

Order designation: SL17 4F Single-Mode OS2
Outer Ø ≈: 3.5 mm
Net weight ≈: 18 kg/km
Tensile rating ≈: 3.4 kN
Core / stranding: Hermetic / gel-filled optical core

All sizes (3)

Request a quote Datasheet WhatsApp info@tebaoflex.com

Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum

Rated voltage: 12/20 kV
Operating temp.: −10…+60 °C
Min. bend radius: 20 × OD
Core / conductor: 8–24 SM Pairs
Outer protection: LW HDPE
Standard: ITU-T G.978

Typical values for this cable type, based on ITU-T G.978 / UJC Qualified 15 kV DC Transoceanic SL17 — confirmed in the datasheet and quotation for your order.

Application fit

Is SL17 (SL17-LW / SL17-LWA / SL17-DA) right for your machine?

Immersion & wet locations

Suitable

Water-blocked core matrix and hydrolysis-resistant subsea jacketing withstand continuous deepwater hydrostatic pressure.

Vertical / spreader reel

Suitable

Torque-balanced aramid or contra-helical steel armour supports vertical winch deployment without hockling.

Offshore platform & shipboard deck trays

Suitable

Marine-grade outer sheath and armour package resist LARS sheave abrasion, UV exposure and salt-spray corrosion.

Trailing & towing

Suitable

High tensile breaking strength supports underwater towing, ROV excursion and seabed plough/trencher duty.

Energy chain / drag chain

Not suitable

Subsea umbilical and tow construction is not intended for high-cycle indoor factory drag chains.

Use Drag-Chain Servo Cable

Typical machinesMarine & Offshore CableWork-Class & Observation ROV SystemsOffshore Wind & Subsea Power GridsOceanographic, Sonar & Seismic SurveyCommercial Diving & Subsea Intervention

Construction

Layer by layer

Shown: SL17 (SL17-LW / SL17-LWA / SL17-DA) (ITU-T G.978 / UJC Qualified 15 kV DC Transoceanic SL17) featuring unit fiber structure (ufs), 24-wire dual-layer steel pressure vault and galvanized steel armour & tar nylon yarn (5-layer construction).

Schematic, not to scale — generated from the layer data

#	Layer	Material & reference
1	Unit Fiber Structure (UFS)	Extruded PBT loose tube filled with thixotropic gel housing 8–24 SM fiber pairs
2	24-Wire Dual-Layer Steel Pressure Vault	Inner 8×Ø1.59 mm + outer 16 alternating (Ø1.50/1.13 mm) wires + hydrophobic fill
3	Seam-Welded Copper Sheath (15 kV DC)	Continuously welded copper tube (1.00 Ω/km @ 3 °C) providing radial H₂ barrier
4	EAA Co-Extrusion & MDPE/HDPE Jacket	Bonded high-voltage polyethylene insulation forming the Ø 17.0 mm SL17-LW core
5	Galvanized Steel Armour & Tar Nylon Yarn	18×Ø3.35 mm armour wires (SL17-LWA, +24 on DA) + 2 layers tar-impregnated nylon

SL17 (SL17-LW / SL17-LWA / SL17-DA) — Standard Subsea & Marine Execution

Built to ITU-T G.978 / UJC Qualified 15 kV DC Transoceanic SL17 with unit fiber structure (ufs) and galvanized steel armour & tar nylon yarn

SL17 (SL17-LW / SL17-LWA / SL17-DA) — Custom Drum Length & Termination Kit

Available in custom continuous subsea/wellbore drum lengths or pre-terminated assemblies

SL17 (SL17-LW / SL17-LWA / SL17-DA) — Routine & Hydrostatic Test Certified

Supplied with EN 10204 3.1 routine dielectric, resistance & pressure/dimensional report

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on ITU-T G.978 / UJC Qualified 15 kV DC Transoceanic SL17. Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated voltage / transmission duty: 12/20 kV (ITU-T G.978 / UJC Qualified 15 kV DC Transoceanic SL17)
Core / conductor construction: Unit Fiber Structure (UFS) — Extruded PBT loose tube filled with thixotropic gel housing 8–24 SM fiber pairs
Primary dielectric / buffering: 24-Wire Dual-Layer Steel Pressure Vault — Inner 8×Ø1.59 mm + outer 16 alternating (Ø1.50/1.13 mm) wires + hydrophobic fill

Thermal

Continuous operating temperature: −10…+60 °C (subsea, marine & submersible duty)
Short-circuit / peak thermal rating: Verified thermal stability per ITU-T G.978 / UJC Qualified 15 kV DC Transoceanic SL17
Storage & transport temperature: −40…+80 °C on export wooden/steel drum

Mechanical

Outer protection / armouring: Galvanized Steel Armour & Tar Nylon Yarn — 18×Ø3.35 mm armour wires (SL17-LWA, +24 on DA) + 2 layers tar-impregnated nylon
Minimum bending radius: 20 × OD
Hydrostatic, tensile & crush duty: EAA Co-Extrusion & MDPE/HDPE Jacket — Bonded high-voltage polyethylene insulation forming the Ø 17.0 mm SL17-LW core

Resistance

Hydrostatic pressure & water blocking: Engineered for continuous submersion and hydrostatic integrity per ITU-T G.978 / UJC Qualified 15 kV DC Transoceanic SL17
Seawater, oil & chemical resistance: Resistant to seawater hydrolysis, hydraulic oils and abrasion per ITU-T G.978 / UJC Qualified 15 kV DC Transoceanic SL17
RoHS & REACH compliance: RoHS 2 (2011/65/EU + 2015/863) & REACH SVHC compliant

Reference standards

Governing standard: ITU-T G.978 / UJC Qualified 15 kV DC Transoceanic SL17
Environmental & test standards: IEC 60228 / IEC 60332 / ISO 13628-5 / EN 10204
Quality management & inspection: ISO 9001:2015 & EN 10204 3.1 factory routine inspection

Identification

Model designation: SL17 (SL17-LW / SL17-LWA / SL17-DA)
Sheath colour & metre marking: Continuous metre-marked black outer finish (LW HDPE / LWA & DA SWA)
Customs tariff (HS): 8544.49 / 8544.60 / 8544.70

Sizes

3 standard SL17 (SL17-LW / SL17-LWA / SL17-DA) subsea & marine configurations

Manufactured to ITU-T G.978 / UJC Qualified 15 kV DC Transoceanic SL17 for subsea, offshore, deep-well and marine applications.

Dimensions, tensile load & weights
Order designation	Configuration	Core / stranding	Outer Ø ≈ mm	Net weight ≈ kg/km	Tensile rating kN ≈	Min. bend R mm
SL17 (SL17-LW / SL17-LWA / SL17-DA) Construction Schedule (−10…+60 °C)
SL17 4F Single-Mode OS2	4 × G.652.D / G.657.A2 SM (200 kpsi)	Hermetic / gel-filled optical core	3.5	18	3.4	35
SL17 12F Single-Mode OS2	12 × G.652.D / G.657.A2 SM (200 kpsi)	Hermetic / gel-filled optical core	9.8	145	18.0	98
SL17 24F Armoured Subsea	24 × G.652.D SM + Strength Armour	Subsea pressure-resistant optical unit	17.0	580	95.0	255

Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
Custom core cross-sections, pair/fibre counts, armour grades and factory drum lengths available per ITU-T G.978 / UJC Qualified 15 kV DC Transoceanic SL17.

Electrical, optical & thermal parameters
Configuration	Max. DC R₂₀ / Atten. Ω/km or dB/km	Rating / Impedance	Operating temp.
4 × G.652.D / G.657.A2 SM (200 kpsi)	0.35	≤0.35 dB/km @ 1310 nm	−10…+60 °C
12 × G.652.D / G.657.A2 SM (200 kpsi)	0.22	≤0.22 dB/km @ 1550 nm	−10…+60 °C
24 × G.652.D SM + Strength Armour	0.20	≤0.20 dB/km @ 1550 nm	−10…+60 °C

Every production length undergoes routine conductor DC resistance, high-voltage dielectric or OTDR continuity and dimensional verification.

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.

ConductorClass 5 stranding
Spark test100 % in-line
Lay-upCores, earth, fillers
SheathingInner, braid / screen, outer
Electrical testsAC voltage, resistance
DimensionsOD, wall thickness
Inspection documents & dispatchDrum & dispatch

Testing & inspection	Test value / reference	Frequency
Routine tests
Conductor resistance, continuity & dimensional verification (ITU-T G.978 / UJC Qualified 15 kV DC Transoceanic SL17)	DC resistance at 20 °C / optical attenuation and outer diameter within ITU-T G.978 / UJC Qualified 15 kV DC Transoceanic SL17 tolerances	Every manufactured drum length
High-voltage dielectric & insulation resistance test (ITU-T G.978 / UJC Qualified 15 kV DC Transoceanic SL17)	Zero dielectric breakdown and verified insulation resistance for 12/20 kV rating	Every manufactured drum length
Sample tests
Hydrostatic pressure, water-blocking & mechanical endurance qualification (ITU-T G.978 / UJC Qualified 15 kV DC Transoceanic SL17)	Verified submersion integrity, tensile load and thermal stability across −10…+60 °C	Type qualification & periodic lot audit

Inspection certificate

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

Product approvals

ITU-T G.978 / UJC SL17 CompliantEN 10204 3.1 Factory Test CertificateCE, RoHS 2 (2011/65/EU) & REACH

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX SL17 (SL17-LW / SL17-LWA / SL17-DA) ITU-T G.978 / UJC SL17 12/20 kV CE

Delivery form: Heavy-duty export fumigated wooden drums or steel subsea reels
Standard lengths: 500 m, 1,000 m or custom continuous subsea/wellbore lengths
MOQ: 100 m (standard configurations) · 500 m (custom builds)
Lead time: 2–5 weeks ex-works
Incoterms: EXW, FCA, FOB, CIF, DAP

Technical documents

Downloads

PDFSL17 (SL17-LW / SL17-LWA / SL17-DA) 15 kV DC Undersea Telecom Cable – technical datasheet3 sizes · construction, technical data, approvals XLSXSL17 (SL17-LW / SL17-LWA / SL17-DA) spec data (Excel)All 3 sizes with dimensions and data, for your BOM or quotation

Revision: 2026-10-25
Updated: 2026-10-25

FAQ

Questions engineers ask first

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

What governing standard and construction define SL17 (SL17-LW / SL17-LWA / SL17-DA) (SL17 (SL17-LW / SL17-LWA / SL17-DA) 15 kV DC Undersea Telecom Cable)?

SL17 (SL17-LW / SL17-LWA / SL17-DA) (SL17 (SL17-LW / SL17-LWA / SL17-DA) 15 kV DC Undersea Telecom Cable) is manufactured in accordance with ITU-T G.978 / UJC Qualified 15 kV DC Transoceanic SL17 for 12/20 kV service over -10 °C to +60 °C. Its 5-layer construction comprises unit fiber structure (ufs), 24-wire dual-layer steel pressure vault and galvanized steel armour & tar nylon yarn.

What is the minimum bending radius and operating temperature range for SL17 (SL17-LW / SL17-LWA / SL17-DA)?

The minimum bending radius for SL17 (SL17-LW / SL17-LWA / SL17-DA) is 20 × OD across its continuous operating temperature range of -10 °C to +60 °C, ensuring mechanical and dielectric reliability in subsea, marine and submersible service.

How are the concentric layers of SL17 (SL17-LW / SL17-LWA / SL17-DA) arranged from inside to outside?

From inside to outside, the construction sequence is: (01) Unit Fiber Structure (UFS) — Extruded PBT loose tube filled with thixotropic gel housing 8–24 SM fiber pairs; (02) 24-Wire Dual-Layer Steel Pressure Vault — Inner 8×Ø1.59 mm + outer 16 alternating (Ø1.50/1.13 mm) wires + hydrophobic fill; (03) Seam-Welded Copper Sheath (15 kV DC) — Continuously welded copper tube (1.00 Ω/km @ 3 °C) providing radial H₂ barrier; (04) EAA Co-Extrusion & MDPE/HDPE Jacket — Bonded high-voltage polyethylene insulation forming the Ø 17.0 mm SL17-LW core; (05) Galvanized Steel Armour & Tar Nylon Yarn — 18×Ø3.35 mm armour wires (SL17-LWA, +24 on DA) + 2 layers tar-impregnated nylon.

What factory test certificates are supplied with SL17 (SL17-LW / SL17-LWA / SL17-DA)?

Every production drum of SL17 (SL17-LW / SL17-LWA / SL17-DA) undergoes routine conductor resistance/continuity, high-voltage dielectric and dimensional testing per ITU-T G.978 / UJC Qualified 15 kV DC Transoceanic SL17, and is delivered with an EN 10204 3.1 factory test certificate.

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01Selected sizes

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03Message for our engineers

SL17 (SL17-LW / SL17-LWA / SL17-DA) 15 kV DC Undersea Telecom Cable

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