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Product

PUR underground drilling & tunnelling cablesDIN VDE 0250-8120.6/1 kV (Umax 1.2 kV)EPR 3GI3 + TMPU PUR

ROCKFLEX-PUR PUR Power and Pilot Cable for Underground0.6/1 kV halogen-free PUR power & pilot trailing cable for underground jumbo drill rigs

ROCKFLEX-PUR is a 0.6/1 kV halogen-free polyurethane (TMPU) power and pilot trailing cable engineered for electro-hydraulic underground face drilling jumbos, rock bolters, and shotcrete rigs operating on abrasive granite and hard-rock roadways.

Oil-resistant
Flame-retardant
Water-resistant
Anti-torsion braid
Order designation
ROCKFLEX-PUR 3×50+3×25/3E+3×2.5
Outer Ø ≈
38.6 mm
Copper weight
1,790 kg/km
Total weight ≈
2,540 kg/km
Min. bend R (fixed)
232 mm
All sizes (12)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Rated voltage
0.6/1 kV
Umax 1.2 kV AC · 1.8 kV DC
Conductor
Class 5 Cu
IEC 60228 finely stranded copper
Insulation
EPR 3GI3
+90 °C cross-linked elastomer
Outer sheath
PUR TMPU
Halogen-free yellow/orange PUR
Operating temp.
-40 to +90 °C
Flexing -25 to +80 °C
Min. bend radius
6×D / 10×D
Fixed 6×D · reeling/trailing 10×D

Typical values for this cable type, based on DIN VDE 0250-812 / EN 50525-2-21 (TMPU) — confirmed in the datasheet and quotation for your order.

Application fit

Is ROCKFLEX-PUR right for your machine?

Purpose-built for underground hard-rock jumbo drill rigs, roof bolters, and mobile hydraulic power packs that reel and trail cable across wet, blasted rock floors.

Drilling jumbo & rotary mast feed

Suitable

Primary duty on electro-hydraulic face drill jumbos and bolting rigs with onboard cable reels.

TBM gantry & advancing tunnel reel

Suitable

High-visibility yellow/orange TMPU jacket resists sharp granite spalls and hydraulic oil in headings.

Trailing & towing

Suitable

Integrated pilot/earth-check cores and tear-resistant PUR jacket endure floor dragging.

Motorised monospiral reel

Suitable

Anti-torsion polyamide braid between inner and outer sheaths prevents corkscrewing on rig reels.

Vertical / spreader reel

With conditions

Suitable for short vertical drops up to 35 m; use aramid-reinforced shaft cables for deep shafts.

NSHTÖU or vertical shaft cable
Typical machinesUnderground hard-rock miningDrill & blast tunnellingRock bolting & scaling rigsCavern & hydropower excavation

Construction

Layer by layer

Three Class 5 power cores plus split interstitial earth and pilot monitoring cores, 3GI3 EPR insulation, inner elastomer bedding, open

123456
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Power, earth & pilot conductorsFinely stranded bare or tinned annealed copper, Class 5 per IEC 60228IEC 60228 Class 5
2Core insulationCross-linked ethylene propylene rubber compound 3GI3 (+90 °C)DIN VDE 0207-20
3Short-lay core assembly3 phase cores laid up with split earth and insulated pilot cores around central fillerDIN VDE 0250-812
4Inner sheathHalogen-free elastomeric compound filling core intersticesDIN VDE 0250-812
5Anti-torsion reinforcementOpen-weave high-tenacity polyamide textile braid vulcanised between sheathsRig reel anti-torsion design
6Outer sheathEther-based halogen-free polyurethane TMPU (EN 50363-10-2), high-visibility yellowEN 50363-10-2 TMPU

Symmetrical 3+3E+3P

3 power cores + concentric/split earth + 1–4 pilot cores for Scandinavian/European drill jumbos.

ROCKFLEX-PUR (4G+P)

4 main cores (3 phase + full-size PE) + 2–4 pilot cores for mobile tunnel equipment.

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on DIN VDE 0250-812 / EN 50525-2-21 (TMPU). Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated voltage U0/U
0.6/1 kV (Umax 1.2 kV)
Max. operating DC voltage
1.8 kV DC
AC routine test voltage
3.5 kV rms / 5 min (power) · 2.0 kV (pilot)
Insulation resistance @ 20 °C
≥ 100 MΩ·km

Thermal

Max. conductor operating temp.
+90 °C continuous
Max. short-circuit temperature
+250 °C (max. 5 s)
Ambient temp. (mobile / trailing)
-25 °C to +80 °C
Ambient temp. (fixed installation)
-40 °C to +80 °C

Mechanical

Max. permanent tensile load
20 N/mm² of total copper cross-section
Min. bending radius (fixed)
6 × cable outer diameter
Min. bending radius (reeling/traili
10 × cable outer diameter
Abrasion & tear resistance
DIN EN 50363-10-2 TMPU extra-heavy duty

Resistance

Halogen-free & low smoke
IEC 60754-1 / IEC 60754-2 halogen-free PUR
Oil & hydraulic fluid resistance
IEC 60811-404 mineral & ester oil resistant
Flame retardancy
IEC 60332-1-2 vertical flame test
Water & hydrolysis resistance
Ether-based PUR for continuous mine water

Reference standards

Design basis
DIN VDE 0250-812 / SS 424 14 75 / EN
Conductor standard
IEC 60228 / DIN EN 60228 Class 5
Sheath compound standard
DIN EN 50363-10-2 TMPU

Identification

Power core identification
Brown, Black, Grey (+ Green/Yellow or split
Pilot core identification
White numbered or Red/White control cores
Outer sheath colour
High-visibility yellow (RAL 1021) or orange

Sizes

12 standard configurations (ROCKFLEX-PUR)

Nominal dimensions, copper weights and electrical parameters for ROCKFLEX-PUR per DIN VDE 0250-812 / EN 50525-2-21 (TMPU).

Dimensions & weights
Order designationConfigurationPhase size mm²Outer Ø ≈
mm		Copper
kg/km		Weight ≈
kg/km		Min. bend R
fixed mm		Enquiry
Standard ROCKFLEX-PUR configurations
ROCKFLEX-PUR 3×16+3×16/3E+3×2.53×16 + 3×16/3E + 3×2.51627.57151,180165
ROCKFLEX-PUR 3×25+3×16/3E+3×2.53×25 + 3×16/3E + 3×2.52531.09751,520186
ROCKFLEX-PUR 3×35+3×16/3E+3×2.53×35 + 3×16/3E + 3×2.53534.21,2651,890205
ROCKFLEX-PUR 3×50+3×25/3E+3×2.53×50 + 3×25/3E + 3×2.55038.61,7902,540232
ROCKFLEX-PUR 3×70+3×35/3E+3×2.53×70 + 3×35/3E + 3×2.57043.52,4803,380261
ROCKFLEX-PUR 3×95+3×50/3E+3×2.53×95 + 3×50/3E + 3×2.59548.83,3904,450293
ROCKFLEX-PUR 3×120+3×70/3E+3×2.53×120 + 3×70/3E + 3×2.512053.54,3205,560321
ROCKFLEX-PUR 3×150+3×70/3E+3×2.53×150 + 3×70/3E + 3×2.515058.25,1806,640349
ROCKFLEX-PUR 4G35+2×1.54G35 + 2×1.53533.81,3751,950203
ROCKFLEX-PUR 4G50+2×1.54G50 + 2×1.55038.41,9502,680230
ROCKFLEX-PUR 4G70+2×2.54G70 + 2×2.57043.82,7353,620263
ROCKFLEX-PUR 4G95+2×2.54G95 + 2×2.59549.53,7004,790297
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Outer diameters and weights are nominal factory values subject to ±5 % manufacturing tolerance per DIN VDE 0250-812 / EN 50525-2-21 (TMPU).

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
AC voltage withstand test3.5 kV rms / 5 min on power cores; 2.0 kV on pilot cores100 % of drums
Conductor DC resistanceComplies with IEC 60228 Class 5 at 20 °C100 % of drums
Sample tests
PUR sheath tear & abrasion testEN 50363-10-2 TMPU mechanical & oil immersionPer production batch
Halogen acid gas & flame testIEC 60754-1/2 halogen-free & IEC 60332-1-2Qualification

Inspection certificate

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

Product approvals

DIN VDE 0250-812EN 50363-10-2 TMPUIEC 60754-1/2

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX ROCKFLEX-PUR 0.6/1 kV
Delivery form
Fumigated export wooden drums
Standard drum lengths
300 m · 500 m · 1000 m (or custom cut
MOQ
100 m (stock sizes) · 300 m (custom build)
Lead time
3–5 weeks ex-works
Incoterms
EXW, FOB, CIF, DAP

Technical documents

Downloads

PDFROCKFLEX-PUR PUR Power and Pilot Cable for Underground – technical datasheet12 sizes · construction, technical data, approvalsXLSXROCKFLEX-PUR spec data (Excel)All 12 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 is an ether-based TMPU polyurethane jacket preferred over rubber on underground drill jumbos?
Underground face drilling rigs drag and reel cables across freshly blasted granite, quartz, and wet shotcrete debris where sharp rock edges slice conventional elastomer jackets. Ether-based TMPU polyurethane delivers three to four times higher cut, tear, and abrasion resistance while remaining hydrolysis-proof in alkaline mine water.
What is the difference between the symmetrical 3+3E+3P geometry and ROCKFLEX-PUR 4G+2P?
The 3+3E+3P configuration splits the protective earth into three interstitial conductors and integrates three pilot/control cores for balanced impedance and symmetrical bending on compact jumbo reels. The 4G+2P configuration uses four full-sized power/earth cores plus two pilot cores for standard 4-wire tunnel distribution boxes. Each production drum undergoes routine dielectric voltage testing, conductor DC resistance verification, and sheath dimensional inspection before dispatch with an EN 10204 3.1 mill test certificate.
Can ROCKFLEX-PUR operate on motorized level-wind reels at 1000 V?
Yes. Both constructions are rated 0.6/1 kV (Umax 1.2 kV AC) and incorporate an open-weave polyamide anti-torsion braid vulcanised between the inner elastomer bedding and outer PUR sheath, preventing core corkscrewing during repetitive hydraulic reel pay-out and retrieval. Each production drum undergoes routine dielectric voltage testing, conductor DC resistance verification, and sheath dimensional inspection before dispatch with an EN 10204 3.1 mill test certificate.
Is the cable suitable for halogen-free underground tunnel ventilation safety zones?
Yes. The outer TMPU polyurethane sheath and inner halogen-free elastomer bedding contain no halogens, meeting IEC 60754-1 and IEC 60754-2 so corrosive acid gases are not released during an electrical fault in confined tunnel headings. Each production drum undergoes routine dielectric voltage testing, conductor DC resistance verification, and sheath dimensional inspection before dispatch with an EN 10204 3.1 mill test certificate.

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BUFLEX M / ROCKFLEX-PUR PUR Power and Pilot Cable for Underground

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Reel & motion:
- Reel type: 
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