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Product

Mining trailing & reeling cablesBS 6708640/1,100 V · Types 7 / 7M / 7SCentral Bare Earth

BS 6708 Type 7, Type 7M & Type 7S Mining Trailing Cable640/1,100 V screened coalcutter & face-machine cables with central bare earth

640/1,100 V five-core trailing cable to BS 6708:1998 for underground coal cutters, shearers, Roadheaders and shuttle cars, with three tinned copper/nylon composite screened EPR phase cores, pilot core, conductive cradle and heavy-duty PCP sheath.

EMC screen

Outdoor & humid

Oil-resistant

Flame-retardant

Preview configuration

Order designation: Type 7 · 3×50+25E+25P
Max. OD: 51.8 mm
Min. bend R: 414 mm
Mass ≈: 4,600 kg/km
Cont. current: 170 A

Check against my drum All sizes (21)

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

Rated voltage: 640/1,100 V
Core layout: 3P + E + Pilot
Phase CSA range: 16–150 mm²
Max. conductor T: +90 °C
Min. operating T: −25 °C
Min. bend radius: 8 × 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 7 / 7M / 7S right for your machine?

Flexible 5-core screened coal-cutter and longwall shearer trailing cable to BS 6708 Type 7 / 7M / 7S (640/1100 V) for underground coal face machinery.

Longwall shearer & Bretby handler

Suitable

Primary duty — continuous travel inside articulated Bretby cable handlers along the armoured face conveyor.

Trailing & towing

Suitable

Direct coal-face trailing behind shearers, roadheaders and shuttle cars under heavy abrasion.

Mine roadway & tunnel wall hangers

Suitable

Gate-road loop take-up between gate-end box and longwall face stage loader.

Motorised monospiral reel

With conditions

Short monospiral cable reel on mobile mining equipment at controlled tension.

Free-hanging vertical run

Not suitable

Flexible unarmoured trailing construction — do not suspend in deep vertical mine shafts.

Use BS 6708 Type 20/21 Armoured

Typical machinesUnderground coalcutters & shearersRoadheaders & continuous minersMobile face crushers & feedersDeep-mine gassy headingsSurface quarry mobile plantGate-end box trailing leads

Construction

Layer by layer

Three EPR-insulated Class 5 tinned copper phase cores (each with a coloured textile identification tape and composite tinned copper/nylon braid screen) and one pilot position (unscreened single pilot in Type 7, screened full-size pilot in Type 7M, or unscreened 3-core pilot unit in Type 7S) are laid up in direct contact around a central bare stranded tinned copper earth conductor, bedded in rubber and sheathed in heavy-duty chloroprene (PCP).

Schematic, not to scale — generated from the layer data

#	Layer	Material & reference
1	Phase & pilot conductors	Electrolytic stranded tinned copper wire, IEC 60228 Class 5 (16 to 150 mm²)IEC 60228 Class 5
2	Core insulation	EPR (ethylene-propylene rubber) on phase and pilot cores; central earth is uninsulatedBS 7655 / BS 6708
3	Identification separator	Coloured textile tape applied over core insulationCore identification
4	Composite core screen	Tinned copper and nylon braided screen over phase cores (plus pilot core in Type 7M)Individual composite screen
5	Central bare earth	Uninsulated stranded tinned copper earth conductor (16 to 70 mm²) in centre cradleDirect screen-to-earth contact
6	Inner bedding	Rubber-based elastomeric bedding compound over laid-up coresTorsional bedding
7	Outer sheath	Heavy-duty flame-retardant polychloroprene (chloroprene / PCP) outer sheath, blackBS 6708 / BS 7655 EM2

BS 6708 Type 7 · 16 to 150 mm²

3 screened phase cores + 1 unscreened pilot core (16–95 mm²) + 1 central bare earth (16–70 mm²)

BS 6708 Type 7M · 16 to 150 mm²

3 screened phase cores + 1 screened full-size pilot/4th core (16–150 mm²) + 1 central bare earth (16–70 mm²)

BS 6708 Type 7S · 50 to 150 mm²

3 screened phase cores + 1 unscreened 3-core pilot unit (3×4, 3×6 or 3×10 mm²) + 1 central bare earth (25–70 mm²)

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): 640/1,100 V AC (U0/U)
AC test voltage: 3.0 kV AC on phase cores; 2.5 kV AC on Type 7S 3-core pilot unit
Current ratings (25 °C): 85 to 320 A continuous · 96 to 385 A intermittent (at 25 °C ambient)
Core screening by Type: Type 7: composite tinned copper/nylon braid on 3 phase cores (pilot unscreened) · Type 7M: braid screen on all 3 phase + 1 pilot core · Type 7S: braid screen on 3 phase cores + unscreened 3-core pilot unit
Central earth arrangement: Central uninsulated (bare) stranded tinned copper earth conductor (16 to 70 mm²) in direct contact with composite core screens

Thermal

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

Mechanical

Minimum bending radius: 309 to 630 mm (~8 × maximum overall diameter)
Maximum pulling tension: 480 to 2,000 kgf maximum pulling tension (Type 7/7M); 1,120 to 2,000 kgf (Type 7S)
Bedding & outer sheath: Rubber-based inner bedding compound + heavy-duty polychloroprene (PCP) outer sheath

Resistance

Flame retardance: Flame retardant polychloroprene outer sheath to BS 6708 / BS EN 60332-1-2
Mine & quarry environment: Resists coal-cutter trailing abrasion, rock impact, mineral oils, grease and mine moisture in explosive gas/dust atmospheres

Reference standards

Standards compliance: BS 6708 (Types 7, 7M, 7S); IEC 60228 Class 5; BS 7655
Designated duty: Coalcutters, shearers, excavating and crushing machines in underground coal mines and surface workings

Identification

Core identification: Coloured textile separator tape over EPR core insulation for phase and pilot identification
Screen & earth contact: Composite tinned copper + nylon braid over phase cores in continuous contact with bare central earth conductor
Outer sheath: Heavy-duty black chloroprene (PCP) outer sheath

Sizes

21 configurations across BS 6708 Type 7 (8 sizes), Type 7M (8 sizes) & Type 7S (5 sizes)

Switch between Dimensions & Current Ratings and Electrical Parameters (DC resistance, reactance, insulation resistance and voltage drop).

Dimensions, weights & current
Type · nominal CSA mm²	Phase stranding	Cond. Ø mm	Insul. Ø mm	Screen Ø mm	Earth mm²	Pilot mm²	Min. OD mm	Max. OD mm	Min. bend R mm	Max. pull kgf	Cu mass kg/km	Mass ≈ kg/km	Cont. A (25 °C)	Interm. A (25 °C)
BS 6708 Type 7 · 640/1,100 V (3 Screened Phase + 1 Unscreened Pilot + Central Bare Earth)
Type 7 · 3×16+16E+16P	126/0.40	5.50	8.85	11.15	1×16	1×16 (unscr.)	35.8	38.6	309	480	1,070	2,400	85	96
Type 7 · 3×25+16E+16P	196/0.40	6.75	10.35	12.65	1×16	1×16 (unscr.)	39.7	42.9	343	642	1,330	2,950	110	125
Type 7 · 3×35+18E+16P	276/0.40	8.00	11.60	13.90	1×18	1×16 (unscr.)	43.1	46.3	370	834	1,690	3,520	135	150
Type 7 · 3×50+25E+25P	396/0.40	9.75	13.60	15.90	1×25	1×25 (unscr.)	48.5	51.8	414	1,200	2,320	4,600	170	200
Type 7 · 3×70+35E+35P	360/0.50	11.60	15.70	18.00	1×35	1×35 (unscr.)	55.1	58.8	470	1,680	3,190	6,200	205	250
Type 7 · 3×95+50E+50P	475/0.50	12.75	17.25	19.55	1×50	1×50 (unscr.)	62.4	66.1	529	2,000	4,300	7,900	250	310
Type 7 · 3×120+50E+70P	608/0.50	15.10	20.05	22.35	1×50	1×70 (unscr.)	68.0	72.5	580	2,000	5,100	9,650	295	355
Type 7 · 3×150+70E+95P	740/0.50	17.00	22.20	24.50	1×70	1×95 (unscr.)	70.4	78.4	627	2,000	6,500	11,500	320	385
BS 6708 Type 7M · 640/1,100 V (3 Screened Phase + 1 Screened Pilot + Central Bare Earth)
Type 7M · 3×16+16E+16P	126/0.40	5.50	8.85	11.15	1×16	1×16 (screened)	35.8	38.6	309	480	1,130	2,500	85	96
Type 7M · 3×25+16E+25P	196/0.40	6.75	10.35	12.65	1×16	1×25 (screened)	39.7	42.9	343	642	1,380	3,150	110	125
Type 7M · 3×35+18E+35P	276/0.40	8.00	11.60	13.90	1×18	1×35 (screened)	43.1	46.3	370	834	1,800	3,650	135	150
Type 7M · 3×50+25E+50P	396/0.40	9.75	13.60	15.90	1×25	1×50 (screened)	48.5	51.8	414	1,200	2,450	4,700	170	200
Type 7M · 3×70+35E+70P	360/0.50	11.60	15.70	18.00	1×35	1×70 (screened)	55.1	58.8	470	1,680	3,350	6,350	205	250
Type 7M · 3×95+50E+95P	475/0.50	12.75	17.25	19.55	1×50	1×95 (screened)	62.4	66.1	529	2,000	4,500	8,200	250	310
Type 7M · 3×120+50E+120P	608/0.50	15.10	20.05	22.35	1×50	1×120 (screened)	68.0	72.5	580	2,000	5,300	9,900	295	355
Type 7M · 3×150+70E+150P	740/0.50	17.00	22.20	24.50	1×70	1×150 (screened)	70.4	78.4	627	2,000	7,350	11,800	320	385
BS 6708 Type 7S · 640/1,100 V (3 Screened Phase + 3-Core Pilot Unit + Central Bare Earth)
Type 7S · 3×50+25E+3×4P	396/0.40	9.75	13.60	15.90	1×25	3×4 unit (15.6 mm)	48.5	51.8	420	1,120	2,200	4,450	170	200
Type 7S · 3×70+35E+3×6P	360/0.50	11.60	15.70	18.00	1×35	3×6 unit (17.7 mm)	55.1	58.8	470	1,570	3,150	6,080	205	250
Type 7S · 3×95+50E+3×6P	475/0.50	12.75	17.25	19.55	1×50	3×6 unit (19.3 mm)	62.4	66.1	530	2,000	4,250	6,650	250	310
Type 7S · 3×120+50E+3×10P	608/0.50	15.10	20.05	22.35	1×50	3×10 unit (22.1 mm)	68.0	72.5	580	2,000	4,800	8,300	295	355
Type 7S · 3×150+70E+3×10P	740/0.50	17.00	22.20	24.50	1×70	3×10 unit (24.2 mm)	70.4	78.4	630	2,000	5,300	10,500	320	385

Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
In Type 7S, the 3-core unscreened pilot unit uses 3×4 mm² (56/0.30, unit Ø 15.60 mm), 3×6 mm² (84/0.30, unit Ø 17.70–19.25 mm) or 3×10 mm² (80/0.40, unit Ø 22.05–24.20 mm).
Continuous and intermittent current ratings are referenced at 25 °C ambient temperature per BS 6708.

Electrical parameters
Type · nominal CSA mm²	Phase DC res. Ω/km (20 °C)	Pilot DC res. Ω/km (20 °C)	Screens + earth Ω/km	Reactance 50 Hz Ω/km	Reactance 60 Hz Ω/km	Min. insul. res. MΩ·km	Voltage drop mV/A/m
BS 6708 Type 7 · Electrical data
Type 7 · 3×16+16E+16P	1.240	1.240	0.660	0.109	0.131	435	2.62
Type 7 · 3×25+16E+16P	0.795	1.240	0.560	0.107	0.128	375	1.68
Type 7 · 3×35+18E+16P	0.565	1.240	0.540	0.101	0.121	325	1.20
Type 7 · 3×50+25E+25P	0.393	0.795	0.440	0.098	0.118	285	0.84
Type 7 · 3×70+35E+35P	0.277	0.565	0.300	0.095	0.114	260	0.61
Type 7 · 3×95+50E+50P	0.210	0.393	0.260	0.094	0.113	250	0.47
Type 7 · 3×120+50E+70P	0.164	0.277	0.240	0.092	0.110	250	0.38
Type 7 · 3×150+70E+95P	0.132	0.210	0.176	0.080	0.096	250	0.32
BS 6708 Type 7M · Electrical data
Type 7M · 3×16+16E+16P	1.240	1.240	0.580	0.109	0.131	435	2.62
Type 7M · 3×25+16E+25P	0.795	0.795	0.470	0.107	0.128	375	1.68
Type 7M · 3×35+18E+35P	0.565	0.565	0.450	0.101	0.121	325	1.20
Type 7M · 3×50+25E+50P	0.393	0.393	0.380	0.098	0.118	285	0.84
Type 7M · 3×70+35E+70P	0.277	0.277	0.270	0.095	0.114	260	0.61
Type 7M · 3×95+50E+95P	0.210	0.210	0.230	0.094	0.113	250	0.47
Type 7M · 3×120+50E+120P	0.164	0.164	0.210	0.092	0.110	250	0.38
Type 7M · 3×150+70E+150P	0.132	0.132	0.158	0.080	0.096	250	0.32
BS 6708 Type 7S · Electrical data
Type 7S · 3×50+25E+3×4P	0.393	5.470	0.440	0.098	0.118	285	0.84
Type 7S · 3×70+35E+3×6P	0.277	3.600	0.300	0.095	0.114	260	0.61
Type 7S · 3×95+50E+3×6P	0.210	3.600	0.260	0.094	0.113	250	0.47
Type 7S · 3×120+50E+3×10P	0.164	2.090	0.240	0.092	0.110	250	0.38
Type 7S · 3×150+70E+3×10P	0.132	2.090	0.176	0.080	0.096	250	0.32

Screens + earth resistance reflects the three composite copper/nylon phase screens (plus pilot screen in Type 7M) in parallel contact with the central bare earth conductor.

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 828 mm

Minimum bending radius: 414 mm
Min. drum core diameter: ≈ 828 mm
Cable weight on drum: 460.0 kg
Outer diameter: 51.8 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.

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	3.0 kV AC on phase cores; 2.5 kV AC on Type 7S 3-core pilot unit	Every drum
Phase, pilot & composite screen/earth DC resistance	Verified at 20 °C against BS 6708 table limits (0.132–1.24 Ω/km phase; 0.158–0.66 Ω/km screen+earth)	Every drum
Sample tests
Flame retardance test	Self-extinguishing chloroprene outer sheath per BS 6708 / BS EN 60332-1-2	Production batch
Dimensional & sheath concentricity check	Verification of core screen diameter, minimum/maximum overall diameter and sheath thickness	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 7 (or TYPE 7M / TYPE 7S) · 640/1100 V · [size] · PCP

Delivery form: Heat-treated seaworthy wooden drums lagged with solid timber battens
Lengths: Custom cut-to-length reels per coalface machine 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 7, Type 7M & Type 7S Mining Trailing Cable – technical datasheet21 sizes · construction, technical data, approvals XLSXBS 6708 Type 7 / 7M / 7S spec data (Excel)All 21 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 do BS 6708 Type 7, Type 7M and Type 7S differ from one another?

All three are 640/1,100 V four-position trailing cables laid up around a central bare tinned copper earth conductor, with composite tinned-copper/nylon braid screens on the three phase cores. Type 7 has one unscreened single pilot core (16 to 95 mm²). Type 7M has a full-size fourth/pilot core (16 to 150 mm²) that is also individually screened with a copper/nylon braid. Type 7S replaces the single pilot core with an unscreened 3-core pilot unit (3×4, 3×6 or 3×10 mm²) for multi-channel control and interlock circuits.

How does the central bare earth conductor work with the phase screens?

Unlike elastomeric-cradle cables (such as BS 6708 Types 11, 14 and 16), Types 7, 7M and 7S place an uninsulated stranded tinned copper earth conductor (16 to 70 mm²) in the geometric centre of the cable. The composite copper/nylon braided phase screens lie in continuous longitudinal contact with this central bare earth conductor, providing a low-impedance earth-fault return path (0.158 to 0.660 Ω/km combined screen+earth resistance).

What are the continuous and intermittent current ratings based on?

Per BS 6708 and the published datasheets, continuous current ratings (85 to 320 A) and cyclic intermittent coalcutter ratings (96 to 385 A) are stated at a 25 °C ambient reference temperature. Apply appropriate derating factors where mine roadway ambient temperatures exceed 25 °C or where cable is coiled.

What is the minimum dynamic bending radius for BS 6708 Type 7, 7M and 7S cables?

Across all conductor cross-sections from 16 mm² to 150 mm², the minimum bending radius for mobile trailing service is 8 × maximum overall cable diameter (ranging from 309 mm on 3×16+16+16E up to 630 mm on 3×150+3×10+70E).

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03Message for our engineers

BS 6708 Type 7, Type 7M & Type 7S Cable

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Reel & motion:
- Reel type: 
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- Travel speed (m/min): 
- Max. acceleration: 
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- Exposure (outdoor, water, oil, abrasion): 
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Datasheet Request a quote

BS 6708 Type 7, Type 7M & Type 7S Mining Trailing Cable640/1,100 V screened coalcutter & face-machine cables with central bare earth

Longwall shearer & Bretby handler

Trailing & towing

Mine roadway & tunnel wall hangers

Motorised monospiral reel

Free-hanging vertical run

BS 6708 Type 7 · 16 to 150 mm²

BS 6708 Type 7M · 16 to 150 mm²

BS 6708 Type 7S · 50 to 150 mm²

Electrical

Thermal

Mechanical

Resistance

Reference standards

Identification

Check results

Inspection certificate

Product approvals

Company certificates

01Selected sizes

02Reel & motion

03Message for our engineers

BS 6708 Type 11, Type 14 & Type 16 Cable

BS 6708 Type 20 & Type 21 Armoured Cable

BS 6708 Type 201 & Type 211 Armoured Trailing