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Product

Industrial control, signal & fieldbus cables50 V Underground SignalASTM B174 Class KXLPO + TPU · MSHA

Longwall Signal Cable (50 V · 18–10 AWG)50 V Class K flexible XLPO/TPU underground longwall mining signal & pull-cord cable

Low-voltage 50 V flexible signal, pull-cord and intercom cable for underground longwall mining with ASTM B174 Class K copper cores (18–10 AWG, 2–9C), +90 °C non-chlorinated XLPO insulation and an MSHA TPU jacket.

EMC screen
Flame-retardant
Oil-resistant
Water-resistant
Order designation
Longwall Signal · 4 × 14 AWG
Conductors
4 cores
Nominal OD
14.0 mm
Nominal OD (in)
0.550 in
Mass ≈
247 kg/km
Check against my drumAll sizes (40)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Rated voltage
50 V
Underground signal & pull-cord
Conductor sizes
18–10 AWG
5 gauge steps
Core counts
2 to 9 cores
40 standard constructions
Conductor class
Class K (B174)
Extra-flexible copper
Max. conductor T
+90 °C
Non-chlorinated XLPO
Min. bend radius
6 × OD
8 × OD if braid-shielded

Typical values for this cable type, based on ASTM B174 Class K · MSHA 30 CFR Part 7 — confirmed in the datasheet and quotation for your order.

Application fit

Is Longwall Signal 50 V right for your machine?

Heavy-duty screened underground longwall pull-key, lockout, voice-communication and pilot control cable for coal face conveyors and roof supports.

Longwall shearer & Bretby handler

Suitable

Runs alongside power cables in longwall face spill-plates and chock-to-chock harnesses.

Mine roadway & tunnel wall hangers

Suitable

Primary duty — gate-road and coal-face emergency trip, lockout and intercom lines.

Trailing & towing

Suitable

Rugged PCP/CSP outer sheath resists rock fall, water and hydraulic emulsion along the face.

Motorised monospiral reel

Not suitable

Built for face spill-plates and roadway brackets, not high-speed motorised crane reels.

Use (N)SHTÖU Control Reel

Free-hanging vertical run

Not suitable

Not self-supporting for deep vertical mine shafts without messenger wire.

Use BS 6708 Type 506–524
Typical machinesLongwall powered roof supportsEmergency pull-cord lockout linesMine page-phone & intercom trunksArmored face conveyor (AFC) alarmsBretby & monorail cable handlersStage-loader & gate-road telemetry

Construction

Layer by layer

Two to nine ASTM B174 Class K extra-flexible copper conductors are insulated with chemically cross-linked, non-chlorinated flame-retardant polyolefin (XLPO), planetary cabled, optionally enclosed by a full copper braid shield, and protected by an extra-tough MSHA flame-resistant thermoplastic polyurethane (TPU) jacket.

12345
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Signal conductors (2 to 9)Extra-flexible bunch-stranded annealed copper per ASTM B174 (Class K), 18 AWG to 10 AWGASTM B174 Class K
2Core insulationChemically cross-linked, non-chlorinated, flame-retardant polyolefin (XLPO, +90 °C rated)Halogen-free thermoset
3Core assembly & separatorShort-lay cabled insulated cores with low-friction binder tapeFlex-life optimization
4Optional copper braid shieldFull copper wire braid shield over core assembly (optional by order)EMI/RFI & crush protection
5Outer jacketExtra-tough flame-retardant thermoplastic polyurethane (TPU), black standard or high-visibility orange optionalMSHA 30 CFR Part 7

Standard Unshielded TPU (Black or Orange)

2 to 9 Class K XLPO cores under a heavy-duty black or high-visibility orange TPU jacket (40 standard sizes)

Full Copper Braid Shielded Option

Adds an overall copper wire braid shield beneath the TPU sheath for VFD EMI rejection and extra radial crush resistance

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on ASTM B174 Class K · MSHA 30 CFR Part 7. Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated voltage
50 V (underground longwall signal, pull-cord and intercom circuits)
Conductor size range
18 AWG, 16 AWG, 14 AWG, 12 AWG and 10 AWG (2 to 9 conductors per size)
Optional EMI/RFI shield
Optional full copper braid shield over core assembly for EMI/RFI and crush protection

Thermal

Max. continuous conductor temp.
+90 °C (cross-linked flame-retardant polyolefin)
Ambient operating range
−40 °C to +90 °C
Halogen-free core insulation
Chemically cross-linked, non-chlorinated, flame-retardant polyolefin (XLPO)

Mechanical

Min. bending radius
6 × OD (unshielded) · 8 × OD (with optional copper braid shield)
Conductor stranding
Class K extra-flexible bunch-stranded annealed copper per ASTM B174
Outer jacket material
Extra-tough thermoplastic polyurethane (TPU) jacket for cut, tear and rock-impact resistance

Resistance

Flame retardance
MSHA 30 CFR Part 7 flame resistance (embossed MSHA marking)
Abrasion, cut & crush
Heavy-duty TPU outer sheath resists coal-face roof-support pinch, rock abrasion and monorail flexing
Water, oil & emulsion
Resistant to mine water, hydraulic roof-support emulsions, grease and mineral oils

Reference standards

Conductor standard
ASTM B174 Class K extra-flexible copper
Mine safety compliance
MSHA flame-resistant acceptance for underground coal and hard-rock mines
Manufacturing tolerance
±5 % on nominal outside diameter

Identification

Core identification
Colour-coded and/or number-printed XLPO insulated cores for fast barrier-box termination
Outer jacket colour
Black TPU standard · High-visibility orange TPU optional

Sizes

40 standard constructions · 18 AWG to 10 AWG (2 to 9 conductors, 50 V)

Switch AWG tabs to view nominal insulation diameter, overall diameter and cable weight for 2C through 9C constructions.

All 40 constructions · 18–10 AWG (2C–9C)
Designation
Cores × AWG		Cores
No.		Insul. Ø
in		Insul. Ø
mm		Nominal OD
in		Nominal OD
mm		Weight ≈
lb/kft		Mass ≈
kg/km		Enquiry
18 AWG (2C–9C)
Longwall Signal · 2 × 18 AWG20.1152.920.44011.287129
Longwall Signal · 3 × 18 AWG30.1152.920.46011.7100149
Longwall Signal · 4 × 18 AWG40.1152.920.49012.4117174
Longwall Signal · 5 × 18 AWG50.1152.920.52013.2136202
Longwall Signal · 6 × 18 AWG60.1152.920.56014.2156232
Longwall Signal · 7 × 18 AWG70.1152.920.56014.2163243
Longwall Signal · 8 × 18 AWG80.1152.920.63016.0197293
Longwall Signal · 9 × 18 AWG90.1152.920.66016.8215320
16 AWG (2C–9C)
Longwall Signal · 2 × 16 AWG20.1253.180.46011.799147
Longwall Signal · 3 × 16 AWG30.1253.180.48012.2114170
Longwall Signal · 4 × 16 AWG40.1253.180.51013.0133198
Longwall Signal · 5 × 16 AWG50.1253.180.55014.0158235
Longwall Signal · 6 × 16 AWG60.1253.180.59015.0183272
Longwall Signal · 7 × 16 AWG70.1253.180.59015.0190283
Longwall Signal · 8 × 16 AWG80.1253.180.66016.8225335
Longwall Signal · 9 × 16 AWG90.1253.180.69017.5247368
14 AWG (2C–9C)
Longwall Signal · 2 × 14 AWG20.1403.560.49012.4118176
Longwall Signal · 3 × 14 AWG30.1403.560.51013.0138205
Longwall Signal · 4 × 14 AWG40.1403.560.55014.0166247
Longwall Signal · 5 × 14 AWG50.1403.560.59015.0196292
Longwall Signal · 6 × 14 AWG60.1403.560.63016.0225335
Longwall Signal · 7 × 14 AWG70.1403.560.63016.0238354
Longwall Signal · 8 × 14 AWG80.1403.560.71018.0278414
Longwall Signal · 9 × 14 AWG90.1403.560.75019.0300446
12 AWG (2C–9C)
Longwall Signal · 2 × 12 AWG20.1604.060.52613.4148220
Longwall Signal · 3 × 12 AWG30.1604.060.55514.1177263
Longwall Signal · 4 × 12 AWG40.1604.060.59615.1213317
Longwall Signal · 5 × 12 AWG50.1604.060.64216.3254378
Longwall Signal · 6 × 12 AWG60.1604.060.69017.5297442
Longwall Signal · 7 × 12 AWG70.1604.060.69017.5316470
Longwall Signal · 8 × 12 AWG80.1604.060.77019.6388577
Longwall Signal · 9 × 12 AWG90.1604.060.81520.7426634
10 AWG (2C–9C)
Longwall Signal · 2 × 10 AWG20.1804.570.57014.5186277
Longwall Signal · 3 × 10 AWG30.1804.570.59815.2226336
Longwall Signal · 4 × 10 AWG40.1804.570.64516.4276411
Longwall Signal · 5 × 10 AWG50.1804.570.69617.7331493
Longwall Signal · 6 × 10 AWG60.1804.570.75019.0391582
Longwall Signal · 7 × 10 AWG70.1804.570.75019.0462688
Longwall Signal · 8 × 10 AWG80.1804.570.83521.2519772
Longwall Signal · 9 × 10 AWG90.1804.570.87522.2626932
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • All 40 constructions use ASTM B174 Class K extra-flexible copper conductors with chemically cross-linked non-chlorinated polyolefin (XLPO) core insulation and a heavy-duty TPU outer jacket.
  • Optional full copper braid shield and high-visibility orange TPU jacket available across all 2C to 9C sizes.

Reel check

Will it fit your machine?

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

Check results

Enter your drum core diameterMinimum for this size is about 168 mm
Minimum bending radius
84 mm
Min. drum core diameter
≈ 168 mm
Cable weight on drum
24.7 kg
Outer diameter
14.0 mm
Indicative only: based on the datasheet outer diameter and 6 × 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.

  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
In-line spark & dielectric withstand test100 % spark test on XLPO core insulation and routine dielectric test between conductorsEvery shipping length
Conductor continuity & DC resistance testVerified on all 2 to 9 ASTM B174 Class K copper conductorsEvery shipping length
Sample tests
MSHA flame resistance testSelf-extinguishing per MSHA 30 CFR Part 7 flame resistance criteriaProduction batch

Inspection certificate

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

Product approvals

50 V Underground SignalCE · LVDRoHS · REACH

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX · LONGWALL SIGNAL CABLE · 50V · 90C · [N]/C [AWG] · XLPO/TPU · P-MSHA
Delivery form
Export wooden reels or heavy-duty coils sized to longwall face length
Jacket & shield options
Black TPU standard; high-visibility orange TPU and full copper braid shield on request
Certificate
EN 10204 3.1 factory inspection certificate per batch
Quote response
Engineering specification and quote within 2 business hours

Technical documents

Downloads

PDFLongwall Signal Cable (50 V · 18–10 AWG) – technical datasheet40 sizes · construction, technical data, approvalsXLSXLongwall Signal 50 V spec data (Excel)All 40 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 Longwall Signal Cable rated at 50 V instead of 600 V?
Underground longwall communication, pull-cord lockout and electro-hydraulic shield control circuits operate at low voltages (typically 12 V to 36 V, max 50 V) for personnel safety and intrinsic safety compliance. Designing the XLPO wall specifically for 50 V keeps the cable compact and flexible for tight roof-support routing.
What is the advantage of XLPO insulation and a TPU jacket in longwall mining?
Chemically cross-linked non-chlorinated polyolefin (XLPO) is a +90 °C thermoset that resists deformation under pinch loads and contains no halogens, while the thermoplastic polyurethane (TPU) jacket provides far higher tear, rock-cut and hydraulic-emulsion resistance than standard rubber or PVC.
Can Longwall Signal Cable be ordered with an overall EMI shield or orange jacket?
Yes. Any of the 40 constructions (18 AWG through 10 AWG, 2 to 9 conductors) can be manufactured with a full copper braid shield beneath the jacket for EMI/RFI and crush protection, and with a high-visibility orange TPU sheath instead of standard black.
How do I choose between 18 AWG, 16 AWG, 14 AWG, 12 AWG and 10 AWG?
Select 18 AWG or 16 AWG for short shield-to-shield jumper harnesses, and step up to 14 AWG, 12 AWG or 10 AWG on full-face trunk lines (300 m to 500 m) to keep 24 V DC loop voltage drop within barrier and relay limits.

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Longwall Signal Cable

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