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Product

BS 7917 Offshore Fire-Resistant Cables600/1000 VBS 7917 GSWB ArmouredIEC 60331-21 & Cat. A

BS 7917 A FR Armoured Fire-Resistant Offshore Power Cable0.6/1 kV galvanized steel or phosphor-bronze wire-braid armoured offshore fire cable

BS 7917 A FR (Armoured Fire-Resistant) is a heavy-duty 600/1000 V offshore emergency power and control cable built with Class 2 tinned copper conductors, mica-glass fire tape, GP4 EPR insulation, SW4/SW2 inner bedding, galvanized steel wire braid armour (GSWB,

IEC 60331-21 (750 °C)
SW4 / SW2 Oil & Mud
BS 7917 / UKOOA
Order designation
BS 7917 A FR 3×2.5 GSWB (WM303)
Outer Ø ≈
15.5 mm
Copper weight
74 kg/km
Total weight ≈
385 kg/km
Min. bend R
124 mm
All sizes (14)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Rated voltage
600/1000 V
Also 150/250 V & 1.9/3.3 kV grades
Fire integrity
IEC 60331-21
180 min @ 750 °C circuit survival
Braid armour
GSWB / PBWB
Galvanized steel or bronze wire braid
Insulation
Mica + GP4 EPR
90 °C thermoset elastomer + mica
Sheath compound
SW4 / SW2 LSZH
Inner bedding + outer oil/mud sheath
Min. bend radius
6×D / 8×D
6×OD (≤25 mm) · 8×OD (>25 mm)

Typical values for this cable type, based on BS 7917 / IEC 60331-21 — confirmed in the datasheet and quotation for your order.

Application fit

Is BS 7917 A FR right for your machine?

Specified for open offshore decks, drilling derricks, turret moonpools, FPSO process modules and hazardous Zone 1/Zone 2 areas where emergency shutdown (ESD), firewater pump and deluge systems face hydrocarbon fire and mechanical impact.

Offshore platform & shipboard deck trays

Suitable

GSWB wire braid and heavy SW4/SW2 elastomer sheath withstand open-deck wave slam, oil and drilling mud.

Drilling jumbo & rotary mast feed

Suitable

Suitable for derrick, mud-pit and wellhead ESD power/control circuits in Zone 1/2 hazardous areas.

Fixed installation

Suitable

Terminates with E1XF / barrier offshore glands onto stainless-steel ladder racks.

Motorised monospiral reel

Not suitable

Class 2 tinned copper and galvanized steel wire braid are designed for fixed offshore installation.

S07HXCHX-F screened flex
Typical machinesOffshore oil & gas topsidesFPSO & FLNG process decksJack-up & semi-sub drilling rigsOffshore wind converter platformsLNG marine jetties

Construction

Layer by layer

Class 2 tinned Cu + mica-glass fire tape + GP4 EPR insulation + SW4 elastomeric inner bedding + galvanized steel wire braid (GSWB) + SW4/SW2 LSZH oil/mud outer sheath.

123456
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Tinned annealed copperStranded circular tinned copper conductor, Class 2 per BS EN 60228BS EN 60228
2Mica-glass fire barrierHelically applied phlogopite mica-glass tape over conductorIEC 60331-21
3GP4 EPR thermoset insulationEthylene propylene rubber (EPR) compound type GP4 per BS 7655-1.2BS 7655-1.2
4SW4 elastomeric inner beddingExtruded halogen-free cross-linked elastomeric bedding compoundBS 7655-2.6
5Wire braid armour (GSWB / PBWB)Galvanized steel wire braid (multi-core) or non-magnetic phosphor-bronze wire braid (single-core)BS 7917
6SW4 / SW2 offshore outer sheathHeavy-duty cross-linked LSZH oil- and mud-resistant elastomer per BS 7655-2.6 (Orange or Black)BS 7655-2.6

BS 7917 A FR (GSWB Multi-Core)

Galvanized steel wire braid armour with SW4 or NEK 606 mud-resistant SW2 outer sheath for 2- to 37-core cables.

BS 7917 A FR (PBWB Single-Core)

Non-magnetic phosphor-bronze wire braid armour for high-current single-core AC emergency generator feeders (50–630 mm²).

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on BS 7917 / IEC 60331-21. Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated voltage U0/U
600/1000 V
Routine AC test voltage
3.5 kV rms for 5 minutes
Braid transfer impedance
Provides mechanical armour + 360° EMC screening

Thermal

Continuous conductor temp.
+90 °C
Max. short-circuit temp.
+250 °C (5 s)
Operating temperature range
-40 °C to +90 °C

Mechanical

Min. bend radius (OD ≤25 mm)
6 × overall cable diameter
Min. bend radius (OD >25 mm)
8 × overall cable diameter

Resistance

Circuit integrity in fire
IEC 60331-21 (750 °C for 180 min) / IEC 60331-1
Flame propagation
IEC 60332-3-22 Category A bunched vertical flame test
Oil & drilling fluid resistance
BS 7655-2.6 SW4 / SW2 & NEK 606 mud immersion option

Reference standards

Design & test standard
BS 7917 & UKOOA Code of Practice
Marine classification
Lloyds Register, DNV, ABS type-approval ready

Identification

UKOOA type code
Type 'WM' (600/1000 V fire-resistant EPR/SW4/GSWB/SW4)
Outer sheath colour
Orange (RAL 2003) or Black

Sizes

14 standard configurations (BS 7917 A FR)

Nominal dimensions, masses and electrical ratings for BS 7917 A FR according to BS 7917 / IEC 60331-21.

Dimensions & masses
DesignationCores × mm²Cross-sectionOuter Ø ≈
mm		Copper
kg/km		Total weight ≈
kg/km		Min. bend R
fixed mm		Enquiry
BS 7917 A FR standard series
BS 7917 A FR 2×2.5 GSWB (WM203)2×2.52.5 mm²14.849340118
BS 7917 A FR 3×1.5 GSWB (WM302)3×1.51.5 mm²14.344315114
BS 7917 A FR 3×2.5 GSWB (WM303)3×2.52.5 mm²15.574385124
BS 7917 A FR 3×4 GSWB (WM304)3×44.0 mm²17.2118485138
BS 7917 A FR 3×6 GSWB (WM305)3×66.0 mm²18.6176595149
BS 7917 A FR 3×10 GSWB (WM306)3×1010 mm²21.8294830174
BS 7917 A FR 3×16 GSWB (WM307)3×1616 mm²24.44701,110195
BS 7917 A FR 3×25 GSWB (WM308)3×2525 mm²28.57351,580228
BS 7917 A FR 3×35 GSWB (WM309)3×3535 mm²31.21,0291,960250
BS 7917 A FR 4×2.5 GSWB (WM403)4×2.52.5 mm²16.698440133
BS 7917 A FR 4×6 GSWB (WM405)4×66.0 mm²20.2235705162
BS 7917 A FR 4×16 GSWB (WM407)4×1616 mm²26.86271,360214
BS 7917 A FR 4×35 GSWB (WM409)4×3535 mm²34.41,3722,450275
BS 7917 A FR 1×185 PBWB (WM114)1×185185 mm²30.21,8102,490242
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Nominal outer diameters and weights are subject to manufacturing tolerances per BS 7917 / IEC 60331-21.

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
3.5 kV AC dielectric withstand test5 minutes between cores and wire braid armour100 % of drums
Sample tests
IEC 60331-21 / IEC 60331-1 fire integrity180 minutes @ ≥750 °C (plus mechanical shock option)Type qualification
IEC 60332-3-22 Cat. A vertical flame & oil immersionPasses Category A bunched burn and IRM 902/903 hot oil immersionType qualification

Inspection certificate

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

Product approvals

BS 7917UKOOA Type WM / WJIEC 60331-21 (750 °C, 3 h)IEC 60332-3-22 Cat. ABS 7655-2.6 SW4 / SW2

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX BS 7917 600/1000V FIRE RESISTANT 3x16mm2 GP4/SW4/GSWB/SW4 UKOOA WM307 IEC 60331-21 [year]
Delivery form
Fumigated export wooden drums or shrink-wrapped coils
Standard drum lengths
500 m · 1000 m standard drums (cut lengths on request)
MOQ
100 m (stock sizes) · 300–500 m (production)
Lead time
2–4 weeks ex-works
Incoterms
EXW, FOB, CIF, DAP

Technical documents

Downloads

PDFBS 7917 A FR Armoured Fire-Resistant Offshore Power Cable – technical datasheet14 sizes · construction, technical data, approvalsXLSXBS 7917 A FR spec data (Excel)All 14 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 BS 7917 A FR use galvanized steel wire braid (GSWB) rather than heavy round wire armour (SWA)?
Offshore modules require tight-radius routing through congested deck bulkheads and multi-cable transit frames (MCTs), and platforms experience continuous structural vibration. Braided steel wire armour (GSWB) provides superior flexibility (6× to 8× OD bend radius), lower weight and better vibration fatigue resistance than rigid SWA.
Why are single-core BS 7917 A FR cables armoured with phosphor-bronze wire braid (PBWB)?
On single-core AC power feeders, magnetic steel braid would trap alternating magnetic flux and overheat from induced eddy currents. Non-magnetic phosphor-bronze wire braid (PBWB) eliminates inductive heating while maintaining full marine corrosion and impact protection.
What does the UKOOA code WM signify on BS 7917 A FR cables?
Under the UK Offshore Operators Association (UKOOA) coding system, the first letter 'W' designates a 600/1000 V fire-resistant EPR-insulated power cable with an elastomeric inner covering, galvanized steel wire braid and SW4 elastomeric outer sheath; 'M' denotes metric conductor sizing.
Which cable glands are compatible with BS 7917 A FR in Zone 1 hazardous areas?
Use ATEX/IECEx certified dual-seal flameproof deluge-protected glands (such as CMP E1XF / PX2KX or Hawke 501/453 Universal) that clamp and earth the GSWB/PBWB wire braid while sealing both the SW4 inner bedding and outer sheath.

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BS 7917 A FR Armoured Fire-Resistant Offshore Power Cable

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