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Mining trailing & reeling cablesBS 6708320/550 V · Types 70 & 717/0.45 mm Pliable Wire Armour

BS 6708 Type 70 & Type 71 Pliable Wire Armoured Mining Cable320/550 V 4-core & 5-core × 4 mm² pliable wire-armoured lighting & control cables

320/550 V (BS 6708) 4-core (Type 70) and 5-core (Type 71) × 4 mm² pliable wire-armoured mining cables for coalface lighting, signalling and control, with EPR core insulation, 2.0 mm rubber inner sheath, 7/0.45 mm galvanized steel armour and 2.5 mm PCP sheath.

Outdoor & humid

Oil-resistant

Flame-retardant

Water-resistant

Preview configuration

Order designation: Type 70 · 4×4
Max. OD: 26.0 mm
Min. bend R: 234 mm
Mass ≈: 1,100 kg/km
Cont. current: 28 A

Check against my drum All sizes (2)

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

Rated voltage: 320/550 V
Core layout: 4/5 × 4 mm²
Overall Ø: 23.5–27.4 mm
Max. conductor T: +90 °C
Min. operating T: −25 °C
Min. bend radius: 9 × OD

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

Application fit

Is BS 6708 Type 70 / 71 Armoured right for your machine?

Pliable wire-armoured multipair/multicore underground mine signalling, telephone and pilot interlock cable to BS 6708 Type 70 & Type 71.

Mine roadway & tunnel wall hangers

Suitable

Primary duty — roadway arch suspension for underground conveyor pull-wire, telemetry and comms.

Fixed installation

Suitable

Crush-resistant armoured control runs in shafts, pump lodges and underground switchgear rooms.

Trailing & towing

With conditions

Allows periodic extension and repositioning with advancing gate-road pantechnicons.

Motorised monospiral reel

Not suitable

Pliable steel armour is for static/flitted roadway runs, not dynamic reeling drums.

Use Longwall Signal Cable

Energy chain / drag chain

Not suitable

Armoured construction cannot flex inside energy chains.

Use (N)GRDGCGÖU Chain

Typical machinesCoalface lighting luminaire feedersLongwall chock signalling & controlConveyor pull-wire & emergency stop loopsMine roadway auxiliary circuitsDeep-mine gassy workingsQuarry lighting & control distribution

Construction

Layer by layer

Four (Type 70) or five (Type 71) unscreened 4 mm² (56/0.30 mm) Class 5 tinned copper conductors, each insulated with 1.0 mm EPR and wrapped with coloured textile identification tape, are laid up in contact with each other around an elastomeric cradle, enclosed in a 2.0 mm rubber inner sheath (Ø 15.8 to 19.2 mm), armoured with 7/0.45 mm galvanized steel pliable wire armour and protected by a 2.5 mm heavy-duty black chloroprene (PCP) outer sheath.

Schematic, not to scale — generated from the layer data

#	Layer	Material & reference
1	4 mm² flexible conductors	Electrolytic stranded tinned copper wire, IEC 60228 Class 5 (56/0.30 mm, Ø 2.60 mm)IEC 60228 Class 5
2	Core insulation	EPR (ethylene-propylene rubber), 1.0 mm nominal radial thicknessBS 7655 / BS 6708
3	Identification tape	Coloured textile tape applied over EPR insulation for core identificationCore identification
4	Elastomeric cradle	Central elastomeric cradle around which the cores are laid up in contactCradle centre
5	Inner sheath	Extruded rubber inner sheath (2.0 mm radial thickness; Ø 15.8–17.8 mm on Type 70, Ø 17.2–19.2 mm on Type 71)2.0 mm rubber inner sheath
6	Pliable wire armour (PWA)	Galvanized steel 7/0.45 mm pliable wire armour (≤ 5.07 Ω/km on Type 70; ≤ 4.63 Ω/km on Type 71 at 20 °C)7/0.45 mm PWA
7	Outer sheath	Heavy-duty flame-retardant polychloroprene (chloroprene / PCP) outer sheath, black (2.5 mm radial thickness)BS 6708 / BS 7655 EM2

BS 6708 Type 70 · 4×4 mm²

4 unscreened 4 mm² EPR cores + 2.0 mm rubber inner sheath + 7/0.45 mm galvanized steel PWA + 2.5 mm PCP sheath (23.5–26.0 mm OD)

BS 6708 Type 71 · 5×4 mm²

5 unscreened 4 mm² EPR cores + 2.0 mm rubber inner sheath + 7/0.45 mm galvanized steel PWA + 2.5 mm PCP sheath (24.9–27.4 mm OD)

Technical data

Ratings & operating limits

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

Electrical

Rated voltage (U0/U): 320/550 V AC (U0/U) per datasheet (also covered up to 640/1,100 V in BS 6708:1998)
AC test voltage: 1.5 kV AC dielectric test on all cores
Current rating (25 °C): 28 A continuous current rating at 25 °C ambient (4 mm² Class 5 tinned copper)
Conductor & armour DC resistance: 5.09 Ω/km max. conductor DC resistance at 20 °C · 5.07 Ω/km (Type 70) and 4.63 Ω/km (Type 71) max. armour DC resistance

Thermal

Max. conductor temperature: +90 °C maximum continuous conductor temperature (EPR insulation)
Operating temperature range: −25 °C to +85 °C ambient installation / service range (current ratings referenced at 25 °C)

Mechanical

Minimum bending radius: 234 mm (Type 70 4×4 mm²) and 247 mm (Type 71 5×4 mm²) minimum bending radius (9 × maximum OD)
Maximum pulling tension: 96 kgf (Type 70 4×4 mm²) and 100 kgf (Type 71 5×4 mm²) maximum pulling tension
Sheathing & pliable wire armour: Unscreened EPR cores (1.0 mm wall) laid up in contact + 2.0 mm rubber inner sheath (Ø 15.8–19.2 mm) + 7/0.45 mm galvanized steel pliable wire armour + 2.5 mm heavy-duty PCP outer sheath

Resistance

Flame retardance: Flame retardant polychloroprene outer sheath to BS 6708 / BS EN 60332-1-2
Crush & mine environment: 7/0.45 mm galvanized steel pliable wire armour + 2.5 mm heavy-duty PCP outer sheath resists rockfall impact, abrasion, oil and mine water

Reference standards

Standards compliance: BS 6708 (Types 70 & 71); IEC 60228 Class 5; BS 7655
Designated duty: Coalface lighting, signalling, pilot control and low-power auxiliary circuits in underground mines and quarries

Identification

Core identification: Coloured textile separator tape over EPR core insulation; cores laid up in contact around an elastomeric cradle
Outer sheath: Heavy-duty black chloroprene (PCP) outer sheath (2.5 mm radial thickness)

Sizes

BS 6708 Type 70 (4×4 mm²) & Type 71 (5×4 mm²) armoured cable specifications

Complete dimensional, armour, pulling tension, weight, current rating and DC resistance data.

Dimensions, armour & electrical
Type · nominal CSA mm²	Conductor stranding	Cond. Ø mm	EPR insul. mm	Inner sh. mm	Inner sh. Ø mm	Armour strand	Outer sh. mm	Min. OD mm	Max. OD mm	Min. R mm	Max. pull kgf	Mass ≈ kg/km	Cu wt kg/km	Current (25 °C) A	Cond. DC res. Ω/km	Armour DC res. Ω/km	Enquiry
Type 70 · 4×4	56/0.30	2.60	1.0	2.0	15.8–17.8	7/0.45	2.5	23.5	26.0	234	96	1,100	154	28	5.09	5.07
Type 71 · 5×4	56/0.30	2.60	1.0	2.0	17.2–19.2	7/0.45	2.5	24.9	27.4	247	100	1,230	192	28	5.09	4.63

Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
Both Type 70 (4×4 mm²) and Type 71 (5×4 mm²) use 7/0.45 mm galvanized steel pliable wire armour over a 2.0 mm rubber inner sheath.

Reel check

Will it fit your machine?

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

Cable sizeDrum core diameter (mm)

Cable length on drum (m)

Enter your drum core diameterMinimum for this size is about 468 mm

Minimum bending radius: 234 mm
Min. drum core diameter: ≈ 468 mm
Cable weight on drum: 110.0 kg
Outer diameter: 26.0 mm

Indicative only: based on the datasheet outer diameter and 9 × 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.

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
AC high-voltage dielectric test	1.5 kV AC applied between cores and between cores and pliable wire armour	Every drum
Conductor & armour DC resistance check	≤ 5.09 Ω/km conductor; ≤ 5.07 Ω/km (Type 70) / ≤ 4.63 Ω/km (Type 71) armour at 20 °C	Every drum
Sample tests
Flame retardance test	Self-extinguishing heavy-duty chloroprene outer sheath per BS 6708 / BS EN 60332-1-2	Production batch
Armour & sheath wall inspection	Verification of 2.0 mm rubber inner sheath, 7/0.45 mm galvanized steel armour and 2.5 mm PCP outer sheath	Every drum

Inspection certificate

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

Product approvals

BS 6708CE · LVDRoHS · REACH

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX · BS 6708 TYPE 70 (or TYPE 71) · 320/550 V · [4x4 / 5x4] · PCP

Delivery form: Heat-treated seaworthy wooden drums lagged with solid timber battens
Lengths: Custom cut-to-length reels per coalface lighting/control schedule
Certificate: EN 10204 3.1 inspection certificate with every dispatch
Quote response: Engineering specification and quote within 2 business hours

Technical documents

Downloads

PDFBS 6708 Type 70 & Type 71 Pliable Wire Armoured Mining Cable – technical datasheet2 sizes · construction, technical data, approvals XLSXBS 6708 Type 70 / 71 Armoured 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.

What is the difference between BS 6708 Type 70 and Type 71?

Both are 4 mm² (56/0.30 mm) unscreened pliable wire-armoured auxiliary and coalface lighting cables with 1.0 mm EPR insulation, a 2.0 mm rubber inner sheath, 7/0.45 mm galvanized steel armour and a 2.5 mm PCP outer sheath. Type 70 has 4 cores (4×4 mm², 23.5–26.0 mm OD, 1,100 kg/km) whereas Type 71 has 5 cores (5×4 mm², 24.9–27.4 mm OD, 1,230 kg/km).

How do BS 6708 Types 70/71 differ from Types 62/63/64?

Types 70 and 71 have unscreened EPR-insulated cores (1.0 mm wall, 1.5 kV test voltage) and rely on the 7/0.45 mm galvanized steel pliable wire armour as the metallic screen. Types 62, 63 and 64 have thicker EPR insulation (2.5 kV test voltage) plus individual composite tinned-copper/nylon braided screens over every core beneath the inner sheath and armour.

Why does the datasheet state 320/550 V while some catalogues list 640/1,100 V?

Under earlier BS 6708 coalface lighting standards and the published datasheet, Types 70 and 71 are rated at 320/550 V with a 1.5 kV AC factory test voltage; BS 6708:1998 consolidated small-core armoured lighting/control types under the 640/1,100 V umbrella.

What are the bending radius and pulling tension limits for Types 70 and 71?

Type 70 (4×4 mm²) has a minimum bending radius of 234 mm (9 × Max OD) and 96 kgf maximum pulling tension; Type 71 (5×4 mm²) has a minimum bending radius of 247 mm and 100 kgf maximum pulling tension.

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01Selected sizes

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02Reel & motion

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03Message for our engineers

BS 6708 Type 70 & Type 71 Armoured Cable

Selected sizes:


Reel & motion:
- Reel type: 
- Drum core diameter (mm): 
- Cable length on drum (m): 
- Travel speed (m/min): 
- Max. acceleration: 
- Cycles per hour: 
- Length and quantity: 
- Ambient temperature: 
- Exposure (outdoor, water, oil, abrasion): 
- Destination country: 
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