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Mining trailing & reeling cablesBS 6708 Type 307 / 307M / 307S1,900/3,300 V · 25–150 mm²3 Screened + Bare Earth + Pilot

BS 6708 Type 307, 307M & 307S Mining Cable (1.9/3.3 kV)1,900/3,300 V screened coalcutter & face equipment trailing cable (25–150 mm²)

BS 6708 Type 307, 307M and 307S flexible mining trailing cables (1,900/3,300 V, 25–150 mm²) with three copper/nylon braid-screened EPR phase cores, bare central earth core, pilot core/unit and PCP outer sheath.

EMC screen

Flame-retardant

Oil-resistant

Water-resistant

Preview configuration

Order designation: Type 307 · 3×70 + 50E + 35P
Phase size: 70 mm²
Bare earth: 50 mm²
Max. OD: 65.8 mm
Mass ≈: 7,600 kg/km

Check against my drum All sizes (17)

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

Rated voltage: 1,900/3,300 V
Core arrangement: 3P (scr) + E + P
Phase size range: 25–150 mm²
Ampacity (25 °C): 110–320 A
Operating temp.: −25 to +85 °C
Min. bend radius: 8 × OD (399–640)

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 307 / 307M / 307S (1.9/3.3 kV) right for your machine?

Medium-voltage (1.9/3.3 kV) 5-core screened flexible longwall shearer and coal-face trailing cable to BS 6708 Type 307 / 307M / 307S.

Longwall shearer & Bretby handler

Suitable

Primary duty — 3.3 kV high-output longwall shearers operating in Bretby cable handler troughs.

Trailing & towing

Suitable

Direct trailing behind 3.3 kV roadheaders, continuous miners and face conveyors.

Cylindrical / multi-layer drum

With conditions

Low-speed single/few-layer reeling on underground mobile stage-loader drums.

Free-hanging vertical run

Not suitable

Lacks wire armour for deep shaft or long free-hanging vertical runs.

Use BS 6708 Type 321/331 Armoured

Vertical / spreader reel

Not suitable

Not designed for high-speed vertical crane or spreader reeling.

Use (N)TSCGEWÖU MV Reel

Typical machinesUnderground coalcutters & longwall shearersRoadheaders & continuous minersMobile primary & secondary crushersMine face excavating & loading machinesDeep gassy & dusty coal mine facesSurface quarry 3.3 kV mobile equipment

Construction

Layer by layer

Three IEC 60228 Class 5 tinned copper phase conductors insulated with EPR, wrapped with coloured textile identification tape and individually screened with a tinned-copper/nylon composite braid are laid up in direct contact around a central bare tinned copper earth conductor together with the pilot element: 1 unscreened EPR pilot core (Type 307), 1 copper/nylon braided-screened EPR pilot/fourth core (Type 307M) or a 3-core unscreened pilot sub-unit in its own elastomeric sheath (Type 307S), enclosed by rubber bedding and a heavy-duty chloroprene outer sheath.

Schematic, not to scale — generated from the layer data

#	Layer	Material & reference
1	Phase & pilot conductors	Electrolytic flexible stranded tinned copper wire (IEC 60228 Class 5, 25 to 150 mm²)IEC 60228 Class 5
2	Core insulation	Ethylene propylene rubber (EPR) on phase and pilot cores; central earth conductor is uninsulatedBS 6708 (7.5 kV AC test)
3	Core identification separator tape	Coloured textile tape applied over EPR insulation for phase identificationCore ID
4	Composite copper / nylon core screen	Tinned copper wire and nylon braided screen over 3 phase cores (Type 307/307S) or all 4 insulated cores (Type 307M)BS 6708
5	Bare central earth conductor	Uninsulated Class 5 stranded tinned copper earth core (25 to 70 mm²) laid in contact with all core screensCentral earth
6	Rubber bedding compound	Extruded rubber-based bedding compound filling core intersticesBS 6708
7	Outer sheath	Heavy-duty flame-retardant polychloroprene (chloroprene / PCP) outer sheathBS 6708

BS 6708 Type 307 (25–150 mm²)

3 copper/nylon screened phase cores + 1 unscreened pilot core (16–95 mm²) + 1 bare central earth conductor (25–70 mm²)

BS 6708 Type 307M (25–120 mm²)

3 copper/nylon screened phase cores + 1 copper/nylon screened fourth/pilot core (25–120 mm²) + 1 bare central earth conductor

BS 6708 Type 307S (50–120 mm²)

3 copper/nylon screened phase cores + 1 unscreened 3-core pilot unit (3×4, 3×6 or 3×10 mm² in sub-sheath) + 1 bare central earth

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: 1,900/3,300 V AC (BS 6708 coalcutter & face equipment power supply cable)
Routine AC test voltage: 7.5 kV AC on phase cores · 2.5 kV AC on Type 307S 3-core pilot unit
Current rating (25 °C): 110 to 320 A continuous · 130 to 385 A intermittent cyclic duty
Screen & earth fault path: Tinned copper / nylon braided screens in direct contact with bare central earth conductor (0.14–0.50 Ω/km parallel DC res.)

Thermal

Ambient temperature range: −25 °C to +85 °C
Max. conductor temperature: +90 °C continuous EPR operating temperature

Mechanical

Min. bending radius: 399 mm (25 mm²) to 640 mm (150 mm²) (approx. 8 × max OD)
Max. pulling tension: 640 kgf (25 mm²) to 2,000 kgf (95–150 mm²)
Bedding & outer sheath: Extruded rubber bedding compound + heavy-duty chloroprene (PCP) outer sheath

Resistance

Flame & oil resistance: Heavy-duty flame-retardant and oil-resistant chloroprene (PCP) outer sheath for gassy/dusty mines
Abrasion & impact: Unarmoured flexible coalface trailing construction with elastomeric bedding and thick PCP jacket

Reference standards

Construction standard: BS 6708 (British Standard for flexible mining & quarry cables)
Conductor class: IEC 60228 Class 5 flexible stranded tinned annealed copper
Dielectric & insulation: Ethylene propylene rubber (EPR) phase/pilot insulation · min. 600–1,250 MΩ·km at 20 °C

Identification

Core identification: Coloured textile separator tape over EPR core insulation beneath copper/nylon braided screen
Variant coding: Type 307 (1 unscreened pilot) · Type 307M (1 screened pilot) · Type 307S (3-core unscreened pilot unit)

Sizes

17 standard configurations across BS 6708 Type 307, Type 307M and Type 307S (1,900/3,300 V)

Switch between complete dimensional/mechanical parameters and electrical ratings (25 °C ambient).

Dimensions & mechanical
Designation BS 6708 Type	Phase mm²	Phase strand n/mm	Phase Ø mm	Insul. Ø mm	Screen Ø mm	Bare earth mm²	Pilot core / unit mm²	Pilot Ø mm	Min. OD mm	Max. OD mm	Min. bend mm	Max. pull kgf	Cu mass kg/km	Mass ≈ kg/km
Type 307 · 3×25 + 25E + 16P	25	196/0.40	7.00	13.10	15.50	25	1×16 (unscr.)	11.60	47.4	49.9	400	640	1,654	4,000
Type 307 · 3×35 + 25E + 16P	35	276/0.40	8.50	14.70	17.10	25	1×16 (unscr.)	11.60	51.6	54.6	440	830	1,948	4,800
Type 307 · 3×50 + 35E + 25P	50	396/0.40	10.00	15.70	17.70	35	1×25 (unscr.)	13.10	56.8	59.8	480	1,200	2,666	6,150
Type 307 · 3×70 + 50E + 35P	70	360/0.50	11.70	17.70	19.70	50	1×35 (unscr.)	14.70	62.8	65.8	525	1,680	3,482	7,600
Type 307 · 3×95 + 50E + 50P	95	475/0.50	13.50	19.10	21.10	50	1×50 (unscr.)	15.70	68.9	72.7	580	2,000	4,346	9,250
Type 307 · 3×120 + 70E + 70P	120	608/0.50	15.40	21.40	23.40	70	1×70 (unscr.)	17.70	73.4	77.2	615	2,000	5,450	11,200
Type 307 · 3×150 + 70E + 95P	150	756/0.50	17.20	23.00	25.00	70	1×95 (unscr.)	19.10	75.9	79.7	640	2,000	6,000	13,000
Type 307M · 3×25 + 25E + 25P	25	196/0.40	6.75	13.10	15.50	25	1×25 (screened)	15.50	47.4	49.9	399	642	1,664	4,200
Type 307M · 3×35 + 25E + 35P	35	276/0.40	8.35	14.75	17.10	25	1×35 (screened)	17.10	51.6	54.6	437	834	2,048	5,000
Type 307M · 3×50 + 35E + 50P	50	396/0.40	9.40	15.80	18.20	35	1×50 (screened)	18.20	56.8	59.8	478	1,200	2,866	6,500
Type 307M · 3×70 + 50E + 70P	70	360/0.50	11.35	17.80	20.15	50	1×70 (screened)	20.15	62.8	65.8	526	1,680	3,682	8,100
Type 307M · 3×95 + 50E + 95P	95	475/0.50	12.75	19.20	21.60	50	1×95 (screened)	21.60	68.9	72.7	581	2,000	4,546	9,800
Type 307M · 3×120 + 70E + 120P	120	608/0.50	15.10	21.60	23.95	70	1×120 (screened)	23.95	73.4	77.4	617	2,000	5,650	11,600
Type 307S · 3×50 + 35E + 3×4P	50	396/0.40	9.40	15.80	18.20	35	3×4 (pilot unit)	17.80	56.8	59.8	478	1,200	2,685	5,850
Type 307S · 3×70 + 50E + 3×6P	70	360/0.50	11.35	17.80	20.15	50	3×6 (pilot unit)	19.80	62.8	65.8	526	1,680	3,319	7,150
Type 307S · 3×95 + 50E + 3×6P	95	475/0.50	12.75	19.20	21.60	50	3×6 (pilot unit)	21.20	68.9	72.7	581	2,000	4,039	8,600
Type 307S · 3×120 + 70E + 3×10P	120	608/0.50	15.10	21.60	23.95	70	3×10 (pilot unit)	23.60	73.4	77.2	617	2,000	4,951	10,500

Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
On Type 307, 'Pilot Ø' is the diameter over the unscreened pilot insulation; on Type 307M it is the diameter over the screened pilot core; on Type 307S it is the nominal diameter over the 3-core pilot unit sub-sheath (17.80–23.60 mm).
All three types include a bare central Class 5 tinned copper earth conductor laid in direct contact with the metallic core screens.

Electrical parameters (25 °C)
Designation BS 6708 Type	Cont. current A (25 °C)	Intermittent A (25 °C)	Phase DC 20 °C Ω/km	Pilot DC 20 °C Ω/km	Screens + earth Ω/km	Reactance 50 Hz Ω/km	Reactance 60 Hz Ω/km	Min. IR 20 °C MΩ·km	3-ph V-drop mV/A/m
Type 307 · 3×25 + 25E + 16P	110	130	0.795	1.240	0.50	0.125	0.150	1,250	1.69
Type 307 · 3×35 + 25E + 16P	135	155	0.565	1.240	0.50	0.117	0.141	1,100	1.21
Type 307 · 3×50 + 35E + 25P	170	210	0.393	0.795	0.35	0.113	0.136	950	0.85
Type 307 · 3×70 + 50E + 35P	205	255	0.277	0.565	0.35	0.108	0.129	820	0.61
Type 307 · 3×95 + 50E + 50P	250	315	0.210	0.393	0.28	0.105	0.126	720	0.48
Type 307 · 3×120 + 70E + 70P	295	360	0.164	0.277	0.28	0.101	0.121	660	0.39
Type 307 · 3×150 + 70E + 95P	320	385	0.132	0.210	0.14	0.098	0.118	600	0.32
Type 307M · 3×25 + 25E + 25P	110	130	0.795	0.795	0.45	0.125	0.150	1,250	1.69
Type 307M · 3×35 + 25E + 35P	135	155	0.565	0.565	0.45	0.117	0.141	1,100	1.21
Type 307M · 3×50 + 35E + 50P	170	210	0.393	0.393	0.31	0.113	0.136	950	0.85
Type 307M · 3×70 + 50E + 70P	205	255	0.277	0.277	0.31	0.108	0.129	820	0.61
Type 307M · 3×95 + 50E + 95P	250	315	0.210	0.210	0.25	0.105	0.126	720	0.48
Type 307M · 3×120 + 70E + 120P	295	360	0.164	0.164	0.25	0.101	0.121	660	0.39
Type 307S · 3×50 + 35E + 3×4P	170	210	0.393	5.090	0.35	0.113	0.136	950	0.85
Type 307S · 3×70 + 50E + 3×6P	205	255	0.277	3.390	0.35	0.108	0.129	820	0.61
Type 307S · 3×95 + 50E + 3×6P	250	315	0.210	3.390	0.28	0.105	0.126	720	0.48
Type 307S · 3×120 + 70E + 3×10P	295	360	0.164	1.950	0.28	0.101	0.121	660	0.39

Screens + earth DC resistance is the parallel combination of the 3 phase screens + central earth (Types 307 & 307S) or all 4 core screens + central earth (Type 307M).

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 1,052 mm

Minimum bending radius: 526 mm
Min. drum core diameter: ≈ 1,052 mm
Cable weight on drum: 760.0 kg
Outer diameter: 65.8 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
7.5 kV AC dielectric withstand test	7.5 kV AC on 1,900/3,300 V EPR phase cores (plus 2.5 kV AC on Type 307S pilot unit cores) per BS 6708	Every shipping drum
Conductor, screen & central earth DC resistance	Verified on all phase conductors, pilot conductor(s), and parallel screens + central bare earth per BS 6708	Every shipping drum
Sample tests
Insulation resistance & chloroprene sheath tests	Minimum 600–1,250 MΩ·km at 20 °C; heavy-duty PCP sheath tested for flame, oil and tear resistance	Production batch

Inspection certificate

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

Product approvals

BS 6708 Type 307 / 307M / 307SCE · LVDRoHS · REACH

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX · BS 6708 · TYPE 307 / 307M / 307S · 1900/3300V

Delivery form: Export seaworthy fumigated wooden drums matched to minimum bend radius
Lengths: Standard drum lengths or custom cut lengths per coalface gate-end schedule
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 307, 307M & 307S Mining Cable (1.9/3.3 kV) – technical datasheet17 sizes · construction, technical data, approvals XLSXBS 6708 Type 307 / 307M / 307S (1.9/3.3 kV) spec data (Excel)All 17 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 307, Type 307M and Type 307S differ in construction?

All three are 1,900/3,300 V unarmoured flexible mining power supply cables with three copper/nylon braided-screened EPR phase cores laid in contact around a bare central tinned copper earth conductor. Type 307 includes one unscreened pilot core (16–95 mm²); Type 307M adds an individual copper/nylon braided screen over the fourth/pilot core (25–120 mm²); and Type 307S replaces the single pilot core with a 3-core unscreened pilot unit (3×4, 3×6 or 3×10 mm² enclosed in a 17.8–23.6 mm sub-sheath).

Why is the central earth conductor uninsulated in Type 307, 307M and 307S cables?

Laying the three (or four in Type 307M) composite tinned-copper/nylon core screens in continuous metallic contact with the bare central tinned copper earth conductor creates a low-resistance parallel earth-fault path (0.14–0.50 Ω/km) along the entire cable length, ensuring immediate gate-end tripping on any phase-to-screen fault or external penetration.

What is the difference between continuous and intermittent current ratings in the schedule?

Continuous current ratings (110–320 A) apply to steady full-load duty at 25 °C ambient. Intermittent current ratings (130–385 A) apply to cyclic coalcutter and shearer face passes where periodic off-load intervals allow thermal dissipation.

When should BS 6708 Type 321 / 331 be chosen instead of Type 307?

Type 307/307M/307S is an unarmoured flexible trailing cable for mobile coalcutters and face machines. For semi-fixed mine roadway extensions or quarry trailing routes requiring metallic crush protection, select pliable galvanised steel wire armoured BS 6708 Type 321 (unscreened) or Type 331 (screened).

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BS 6708 Type 307, Type 307M & Type 307S Cable

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