1 / 5

Product

Mining trailing & reeling cablesBS 6708 Type 630 / Type 6313,800/6,600 V · 35–150 mm²Screened + Pliable GSW Armour

BS 6708 Type 630 & 631 MV Armoured Cable (3.8/6.6 kV)3,800/6,600 V screened EPR pliable steel wire armoured mining power cable (35–150 mm²)

BS 6708 Type 630 (3 screened phase cores, 3×35–3×150 mm²) and Type 631 (3 screened phase cores + 1 unscreened EPR earth core, 3×50+35 & 3×70+50 mm²) 3.8/6.6 kV pliable wire armoured mining cables with PCP sheath.

EMC screen

Flame-retardant

Oil-resistant

Water-resistant

Preview configuration

Order designation: Type 630 · 3 × 70 mm²
Phase size: 70 mm²
Current (25 °C): 205 A
Max. OD: 84.9 mm
Mass ≈: 12,050 kg/km

Check against my drum All sizes (8)

Request a quote Datasheet WhatsApp

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

Rated voltage: 3,800/6,600 V
Core arrangement: 3P (scr) ± E
Phase size range: 35–150 mm²
Ampacity (25 °C): 135–320 A
Operating temp.: −25 to +85 °C
Min. bend radius: 12 × OD (894+)

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 630 & Type 631 (3.8/6.6 kV) right for your machine?

6.35/11 kV and 3.8/6.6 kV pliable wire-armoured screened MV mining cable to BS 6708 Type 630 & Type 631 for underground HV distribution.

Mine roadway & tunnel wall hangers

Suitable

Primary duty — suspended on roadway wall brackets between main shaft substations and face transformers.

Fixed installation

Suitable

Heavy galvanized steel strand armour protects HV cores against rock fall and haulage impact.

Trailing & towing

With conditions

Semi-mobile roadway loops moved periodically with district switchgear.

Motorised monospiral reel

Not suitable

Not designed for dynamic crane, TBM or excavator cable reels.

Use (N)TSCGEWÖU MV Reel

Longwall shearer & Bretby handler

Not suitable

Too stiff and large-OD for coal-face shearer cable handlers.

Use BS 6708 Type 307

Typical machinesUnderground 6.6 kV mine roadway distributionLongwall gate-end transformer feedersDeep gassy & dusty coal mine trunksQuarry primary crusher & shovel sub-feedersMobile substation interconnectionsArmoured 3.8/6.6 kV pump & fan feeders

Construction

Layer by layer

Three flexible IEC 60228 Class 5 tinned copper phase conductors (35–150 mm²) insulated with 5.0 mm EPR, wrapped with coloured identification textile tape and individually screened with a composite tinned-copper/nylon braid (plus one unscreened 5.0 mm EPR-insulated earth core on Type 631) are laid up in contact, enclosed by a 3.8–5.0 mm rubber inner sheath, 7/0.90 mm or 7/1.25 mm pliable galvanised steel wire armour and a 6.0–8.0 mm heavy-duty chloroprene outer sheath.

Schematic, not to scale — generated from the layer data

#	Layer	Material & reference
1	Flexible phase conductors (3) + earth core (Type 631)	Electrolytic stranded tinned copper wire, IEC 60228 Class 5 (35 to 150 mm² phases; 35 or 50 mm² earth on Type 631)IEC 60228 Class 5
2	5.0 mm EPR medium-voltage insulation	Ethylene propylene rubber (EPR) dielectric, 5.0 mm nominal radial wall on all phase cores (and Type 631 earth core), 15 kV AC testedBS 6708 (15 kV test)
3	Coloured textile identification tape	Colour-coded textile separator tape over EPR insulation under each core screenBS 6708
4	Composite copper / nylon braided phase screen	Tinned copper wire and nylon braided screen over each of the 3 phase cores (0.42–1.00 Ω/km for 3 screens in parallel)BS 6708
5	Rubber inner bedding sheath	Extruded rubber inner sheath compound (3.8 mm on 3×35 & 3×50; 5.0 mm on 3×70 to 3×150 and Type 631)BS 6708
6	Pliable galvanised steel wire armour	7/0.90 mm (3×35, 3×50, 3×50+35) or 7/1.25 mm (3×70–3×150, 3×70+50) stranded galvanised steel pliable armour (0.39–0.76 Ω/km)BS 6708
7	Heavy-duty chloroprene outer sheath	Heavy-duty flame-retardant polychloroprene (chloroprene / PCP, 6.0 to 8.0 mm radial wall)BS 6708

BS 6708 Type 630 (3×35 – 3×150 mm²)

3 individually copper/nylon braided-screened 5.0 mm EPR phase cores + rubber inner sheath + pliable GSW armour + PCP sheath

BS 6708 Type 631 (3×50+35 & 3×70+50 mm²)

3 individually screened 5.0 mm EPR phase cores + 1 unscreened 5.0 mm EPR earth core (35 or 50 mm²) + pliable GSW armour + PCP sheath

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: 3,800/6,600 V (3.8/6.6 kV) AC · 15 kV routine AC test voltage
Current rating (25 °C): 135 to 320 A continuous at 25 °C ambient (Type 630) · 170 to 205 A (Type 631)
Screen & armour DC resistance: 3 screens in parallel: 0.42–1.00 Ω/km at 20 °C · Pliable GSW armour: 0.39–0.76 Ω/km at 20 °C

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: 12 × Maximum Overall Diameter (894 to 1,247 mm across 35–150 mm²)
Pliable wire armour & sheaths: 3.8–5.0 mm rubber inner sheath + 7/0.90 mm or 7/1.25 mm pliable galvanised steel wire armour + 6.0–8.0 mm heavy-duty PCP outer sheath

Resistance

Crush & impact protection: Pliable galvanised steel wire armour between thick elastomer sheaths withstands rockfall and roadway crush
Flame, oil & gassy mine environment: Heavy-duty chloroprene (PCP) outer sheath (6.0–8.0 mm wall) for deep mines with explosive gas and coal dust

Reference standards

Construction standard: BS 6708 (3.8/6.6 kV screened pliable-armoured mining cables — Type 630 & Type 631)
Conductor & insulation: IEC 60228 Class 5 flexible tinned copper · 5.0 mm EPR insulation · individual Cu/nylon braided phase screens
Routine voltage test: 15 kV AC routine dielectric test on all 3.8/6.6 kV cores

Identification

Type 630 vs Type 631: Type 630: 3 individually screened phase cores · Type 631: 3 individually screened phase cores + 1 unscreened 5.0 mm EPR earth core
Core identification: Coloured textile separator tape over EPR insulation under individual tinned-copper/nylon braided screens

Sizes

8 standard configurations across BS 6708 Type 630 (3-core) & Type 631 (3-core + earth) (3.8/6.6 kV)

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

Dimensions & mechanical
Designation BS 6708 Type	Phase mm²	Phase strand n/mm	Phase Ø mm	EPR wall mm	Earth core mm² (strand · Ø)	Inner wall mm	Inner min Ø mm	Inner max Ø mm	Armour n/mm	Outer wall mm	Min. OD mm	Max. OD mm	Min. bend mm	Cu mass kg/km	Mass ≈ kg/km
Type 630 · 3 × 35 mm²	35	276/0.40	8.40	5.0	—	3.8	53.1	56.1	7/0.90	6.0	70.5	74.5	894	1,010	8,400
Type 630 · 3 × 50 mm²	50	396/0.40	10.10	5.0	—	3.8	56.0	60.0	7/0.90	6.3	75.0	79.3	952	1,450	9,850
Type 630 · 3 × 70 mm²	70	360/0.50	11.90	5.0	—	5.0	63.0	67.0	7/1.25	6.8	80.6	84.9	1,019	2,020	12,050
Type 630 · 3 × 95 mm²	95	475/0.50	13.90	5.0	—	5.0	72.3	72.3	7/1.25	7.3	90.6	94.9	1,139	2,750	13,850
Type 630 · 3 × 120 mm²	120	608/0.50	15.50	5.0	—	5.0	75.5	75.5	7/1.25	7.6	94.4	98.7	1,185	3,460	19,200
Type 630 · 3 × 150 mm²	150	756/0.50	17.20	5.0	—	5.0	80.0	80.0	7/1.25	8.0	99.6	103.9	1,247	4,330	21,200
Type 631 · 3 × 50 + 35E	50	396/0.40	10.10	5.0	1×35 (276/0.40 · 8.40 Ø)	5.0	65.4	69.2	7/0.90	6.9	86.7	91.0	1,092	2,100	12,100
Type 631 · 3 × 70 + 50E	70	360/0.50	11.90	5.0	1×50 (396/0.40 · 10.10 Ø)	5.0	70.5	74.3	7/1.25	7.4	92.8	97.1	1,166	3,100	14,250

Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
All phase cores (and the unscreened earth core in Type 631) have 5.0 mm nominal radial EPR insulation wall thickness.
Minimum bending radius is 12 × Maximum Overall Diameter across all Type 630 and Type 631 configurations.

Electrical parameters (25 °C)
Designation BS 6708 Type	Current rating A (25 °C)	Phase DC 20 °C Ω/km	Earth DC 20 °C Ω/km	Armour DC 20 °C Ω/km	3 screens par. Ω/km
Type 630 · 3 × 35 mm²	135	0.565	—	0.76	1.00
Type 630 · 3 × 50 mm²	170	0.393	—	0.71	0.88
Type 630 · 3 × 70 mm²	205	0.277	—	0.46	0.72
Type 630 · 3 × 95 mm²	250	0.210	—	0.43	0.78
Type 630 · 3 × 120 mm²	295	0.164	—	0.41	0.62
Type 630 · 3 × 150 mm²	320	0.132	—	0.39	0.67
Type 631 · 3 × 50 + 35E	170	0.393	0.565	0.45	0.45
Type 631 · 3 × 70 + 50E	205	0.277	0.393	0.42	0.42

In Type 630, earth fault current is carried by the 3 phase core screens in parallel (0.62–1.00 Ω/km) plus the pliable steel wire armour (0.39–0.76 Ω/km). Type 631 adds a dedicated 35 or 50 mm² copper earth core.

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 2,038 mm

Minimum bending radius: 1,019 mm
Min. drum core diameter: ≈ 2,038 mm
Cable weight on drum: 1,205.0 kg
Outer diameter: 84.9 mm

Indicative only: based on the datasheet outer diameter and 12 × 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
15 kV AC high-voltage dielectric test	15 kV AC routine voltage withstand test on 3.8/6.6 kV 5.0 mm EPR cores per BS 6708	Every shipping drum
Phase, earth, screen & armour DC resistance	Verified on all phase conductors, earth conductor (Type 631), 3 parallel screens and pliable GSW armour at 20 °C	Every shipping drum
Sample tests
Heavy-duty PCP sheath flame, oil & mechanical test	6.0–8.0 mm chloroprene outer sheath tested for deep underground mining service per BS 6708	Production batch

Inspection certificate

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

Product approvals

BS 6708 Type 630 / Type 631CE · LVDRoHS · REACH

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX · BS 6708 · TYPE 630 / TYPE 631 · 3800/6600V

Delivery form: Export seaworthy fumigated wooden drums matched to 12 × OD bend radius
Lengths: Standard drum lengths or custom cut lengths per mine roadway 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 630 & 631 MV Armoured Cable (3.8/6.6 kV) – technical datasheet8 sizes · construction, technical data, approvals XLSXBS 6708 Type 630 & Type 631 (3.8/6.6 kV) spec data (Excel)All 8 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 630 and Type 631?

Both are 3,800/6,600 V (3.8/6.6 kV) pliable steel wire armoured mining cables with individually copper/nylon braided-screened 5.0 mm EPR phase cores. Type 630 contains 3 screened phase cores only (3×35 to 3×150 mm²), relying on the 3 phase screens and pliable wire armour as the earth path. Type 631 adds a fourth unscreened 5.0 mm EPR-insulated copper earth core (3×50+35 mm² and 3×70+50 mm²).

How do Type 630 and Type 631 differ from Type 621 at 3.8/6.6 kV?

Type 630 and Type 631 feature individual tinned-copper/nylon braided metallic screens over each 3.8/6.6 kV phase core inside the inner sheath and pliable wire armour, whereas Type 621 has four unscreened 5.0 mm EPR cores enclosed by an inner sheath and pliable wire armour.

What is the minimum bending radius of BS 6708 Type 630 and Type 631?

The minimum bending radius is 12 × Maximum Overall Diameter across all configurations, ranging from 894 mm on Type 630 3×35 mm² (74.5 mm max OD) to 1,247 mm on Type 630 3×150 mm² (103.9 mm max OD).

When should BS 6708 Type 730 be used instead of Type 630 / 631?

Type 630 and Type 631 are pliable wire armoured cables for mine roadway feeders and semi-fixed installations. For unarmoured flexible trailing service on mobile 6.6 kV mining equipment with a tighter 10 × OD bend radius, select BS 6708 Type 730.

Request a quote

Get an engineering quote for BS 6708 Type 630 & Type 631 (3.8/6.6 kV)

Your selection and application details are copied into the enquiry form below.

01Selected sizes

Use + Add next to a size or configuration.

02Reel & motion

Add your operating conditions here to include them in your enquiry.

Reel typeDrum core diameter (mm)Cable length on drum (m)Travel speed (m/min)Max. accelerationCycles per hourLength and quantityAmbient temperatureExposure (outdoor, water, oil, abrasion)Destination countryEquipment and operating conditions

03Message for our engineers

BS 6708 Type 630 & Type 631 MV 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: 
- Equipment and operating conditions:

Send via WhatsApp

Datasheet Request a quote