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Product

Mining trailing & reeling cablesBS 6708 Type FS4640/1,100 V · 4×2.5 & 4×4 mm²Flat Catenary · Individually Screened

BS 6708 Type FS4 Flat Catenary Cable (640/1,100 V)640/1,100 V 4-core individually screened flat mining catenary cable (4×2.5 & 4×4 mm²)

BS 6708 Type FS4 640/1,100 V flat catenary mining power and pilot supply cable with four parallel Class 5 tinned copper cores (3 phase + 1 pilot), 1.0 mm EPR insulation, individual tinned copper braid screens and a 3.8 mm PCP sheath.

EMC screen
Flame-retardant
Oil-resistant
Water-resistant
Order designation
Type FS4 · 4 × 2.5 mm²
Core CSA
2.5 mm²
Current (25 °C)
28 A
Max. width
31.8 mm
Mass ≈
450 kg/km
Check against my drumAll sizes (2)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Rated voltage
640/1,100 V
3 kV AC routine test
Core arrangement
3P + 1P (Flat)
Non-contacting screens
Standard sizes
4×2.5 & 4×4 mm²
50/0.25 & 50/0.30 mm
Ampacity (25 °C)
28–37 A
Continuous catenary duty
Operating temp.
−25 to +85 °C
1.0 mm EPR + 3.8 mm PCP
Min. bend radius
100–120 mm
Minor-axis catenary loop

Typical values for this cable type, based on BS 6708 · IEC 60228 Class 5 — confirmed in the datasheet and quotation for your order.

Application fit

Is BS 6708 Type FS4 Flat Cable (640/1,100 V) right for your machine?

Purpose-built for 640/1,100 V overhead monorail catenary loops, longwall face cable-handling carriers and suspended auxiliary power/pilot feeds where tight minor-axis bending (100–120 mm), zero torsional twist and electrical isolation between individual core screens are required.

Festoon & line chain

Suitable

Flat parallel 4-core profile bends easily over monorail catenary trolleys (100–120 mm radius) without twisting.

Trailing & towing

Suitable

Used on articulated coalface catenary carriers and suspended machine loops.

Cylindrical / multi-layer drum

With conditions

Flat profile is designed for catenary loops or single-layer flat reels, not cylindrical spiral drum reeling.

Immersion & wet locations

Suitable

3.8 mm heavy-duty chloroprene outer sheath resists mine water, hydraulic oil, coal dust and flame.

Free-hanging vertical run

Not suitable

Flexible unarmoured trailing construction — do not suspend in deep vertical mine shafts without support.

Use BS 6708 Type 20/21 Armoured
Typical machinesUnderground monorail catenary festoon systemsLongwall shearer & stage-loader loop carriers640/1,100 V auxiliary face pump & lighting feedsCoalface pilot & remote-interlock loopsSuspended tunnel & gallery cable carriersGassy mine overhead power distribution

Construction

Layer by layer

Three phase cores and one pilot core (2.5 mm² or 4 mm² IEC 60228 Class 5 tinned copper) are each insulated with 1.0 mm EPR, wrapped with coloured identification textile tape, individually screened with a tinned copper wire braid, and moulded parallel in a flat formation inside a 3.8 mm heavy-duty chloroprene (PCP) outer sheath with elastomeric webs preventing inter-core screen contact.

12345
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Phase (3) & pilot (1) conductorsElectrolytic stranded tinned copper wire, IEC 60228 Class 5 (50/0.25 mm = 2.5 mm² or 50/0.30 mm = 4 mm²)IEC 60228 Class 5
21.0 mm EPR core insulationEthylene propylene rubber (EPR) dielectric, 1.0 mm nominal radial wall (3 kV AC routine test)BS 6708 (3 kV test)
3Coloured textile identification tapeColour-coded textile tape over EPR insulation for phase and pilot identificationBS 6708
4Individual tinned copper braid screenTinned copper braided screen over each of the 4 cores (7.40 Ω/km on 2.5 mm²; 8.48 Ω/km on 4 mm²)BS 6708
5Flat heavy-duty chloroprene outer sheathHeavy-duty flame-retardant polychloroprene (PCP, 3.8 mm nominal radial wall) spacing all 4 screened cores parallel without mutual contactBS 6708

BS 6708 Type FS4 · 4 × 2.5 mm²

3 phase + 1 pilot (50/0.25 mm) · 29.8×12.4 to 31.8×14.4 mm flat profile · 28 A · 450 kg/km

BS 6708 Type FS4 · 4 × 4 mm²

3 phase + 1 pilot (50/0.30 mm) · 32.2×13.3 to 34.1×15.3 mm flat profile · 37 A · 550 kg/km

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on BS 6708 · IEC 60228 Class 5. Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated voltage U0/U
640/1,100 V AC · 3 kV routine AC test voltage
Current rating (25 °C)
28 A (4×2.5 mm²) · 37 A (4×4 mm²) continuous at 25 °C ambient
Conductor & screen DC resistance
Conductors: 7.82 Ω/km (2.5 mm²) / 4.85 Ω/km (4 mm²) · Each copper braid screen: 7.40 Ω/km (2.5 mm²) / 8.48 Ω/km (4 mm²)

Thermal

Ambient temperature range
−25 °C to +85 °C
Max. conductor temperature
+90 °C continuous EPR operating temperature (250 °C short-circuit)

Mechanical

Min. bending radius
100 mm (4×2.5 mm²) · 120 mm (4×4 mm²) on minor flat axis
Flat profile & sheath wall
4 screened cores spaced parallel without contact in a 3.8 mm nominal heavy-duty chloroprene (PCP) flat outer sheath

Resistance

Catenary flexing & twist immunity
Flat parallel geometry eliminates axial corkscrewing on overhead monorail catenary carriers and loop systems
Flame, oil & inter-core isolation
Heavy-duty chloroprene web separates each braided core screen while resisting flame, mineral oil and mine water

Reference standards

Construction standard
BS 6708 (640/1,100 V flat catenary mining power supply cable — Type FS4)
Conductor & insulation
IEC 60228 Class 5 flexible tinned copper (50/0.25 or 50/0.30 mm) · 1.0 mm EPR insulation · individual tinned Cu braid screen
Routine voltage test
3,000 V (3 kV) AC routine dielectric test on all 4 cores

Identification

Core identification
Coloured textile separator tape over 1.0 mm EPR insulation under each tinned copper braid screen (3 phase + 1 pilot)
Screen separation
Each of the 4 tinned copper braided screens is electrically isolated from adjacent screens by the moulded PCP sheath web

Sizes

2 standard configurations: BS 6708 Type FS4 4×2.5 mm² & 4×4 mm² (640/1,100 V Flat)

Complete dimensional, mechanical and electrical schedule per BS 6708.

Dimensions & electrical
Designation
BS 6708 Type		Core CSA
mm²		Stranding
n/mm		Cond. Ø
mm		EPR wall
mm		Sheath wall
mm		Min. W × H
mm		Max. W × H
mm		Min. bend
mm		Current 25 °C
A		Cond. DC 20 °C
Ω/km		Each screen
Ω/km		Cu mass
kg/km		Mass ≈
kg/km		Enquiry
Type FS4 · 4 × 2.5 mm²2.550/0.252.101.03.829.8 × 12.431.8 × 14.4100287.827.40160450
Type FS4 · 4 × 4 mm²4.050/0.302.701.03.832.2 × 13.334.1 × 15.3120374.858.48230550
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Unlike circular BS 6708 trailing cables whose core screens touch each other, Type FS4 spaces all 4 braided cores (3 phase + 1 pilot) in a flat plane without contacting each other.
  • Screen DC resistance (7.40 Ω/km on 4×2.5 mm² and 8.48 Ω/km on 4×4 mm²) is specified per individual core screen at 20 °C.

Reel check

Will it fit your machine?

A first screen using datasheet values. Engineering confirms drum geometry, acceleration and tension with your quotation.

Check results

Enter your drum core diameterMinimum for this size is about 230 mm
Minimum bending radius
115 mm
Min. drum core diameter
≈ 230 mm
Cable weight on drum
45.0 kg
Outer diameter
14.4 mm
Indicative only: based on the datasheet outer diameter and 8 × OD bending radius. Current derating for wound layers per DIN VDE 0298-4 is assessed separately.

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 kV AC dielectric withstand test3,000 V AC routine voltage test on all 4 EPR-insulated cores per BS 6708Every shipping drum
Conductor & individual screen DC resistance + screen isolationMax. 7.82 / 4.85 Ω/km on conductors; max. 7.40 / 8.48 Ω/km on each copper braid screen; electrical non-contact between adjacent screensEvery shipping drum
Sample tests
Chloroprene flat sheath flame, oil & flexing test3.8 mm heavy-duty PCP flat sheath tested for catenary flexing, oil and flame retardance per BS 6708Production batch

Inspection certificate

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

Product approvals

BS 6708 Type FS4CE · LVDRoHS · REACH

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX · BS 6708 · TYPE FS4 · 640/1100V · 4 x [mm²]
Delivery form
Export seaworthy fumigated wooden drums
Lengths
Standard drum lengths or custom cut catenary loop lengths
Certificate
EN 10204 3.1 factory routine test certificate with every drum
Quote response
Engineering specification and quote within 2 business hours

Technical documents

Downloads

PDFBS 6708 Type FS4 Flat Catenary Cable (640/1,100 V) – technical datasheet2 sizes · construction, technical data, approvalsXLSXBS 6708 Type FS4 Flat Cable (640/1,100 V) spec data (Excel)All 2 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 are the 4 screened cores in BS 6708 Type FS4 spaced without contacting each other?
In BS 6708 Type FS4, the three phase cores and one pilot core are laid parallel in a flat plane separated by elastomeric ribs of the 3.8 mm chloroprene outer sheath so that each tinned copper braid screen remains electrically isolated from adjacent core screens.
What applications use BS 6708 Type FS4 flat cable?
Type FS4 is used on underground coal-mine monorail catenary festoon carriers, suspended loop systems along longwall stage loaders, and 640/1,100 V auxiliary power + pilot circuits (up to 28 A on 4×2.5 mm² and 37 A on 4×4 mm²) requiring tight 100–120 mm minor-axis bending.
Why is the 4×2.5 mm² flat width 29.8–31.8 mm instead of the 18.1–20.1 mm printed in the PDF?
Four parallel cores with 2.10 mm conductors, 1.0 mm radial EPR insulation (4.10 mm insulated OD) and individual tinned copper braid screens (~4.8 mm per core) plus two 3.8 mm outer sheath walls already require 26.8 mm before accounting for the three elastomeric separation webs between the non-contacting cores. Compared with 4×4 mm² (32.2–34.1 mm wide, where four 2.70 mm conductors add 4 × 0.60 = 2.4 mm), the physical width of 4×2.5 mm² is 29.8–31.8 mm.
How is screen resistance specified on BS 6708 Type FS4?
Because the four tinned copper braid screens do not contact each other, DC resistance at 20 °C is specified per individual screen: maximum 7.40 Ω/km on 4×2.5 mm² and 8.48 Ω/km on 4×4 mm².

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BS 6708 Type FS4 Flat Cable

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