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28.5 V DC & 270 V DC Aircraft Ground Power (GPU) CablesISO 6858 / SAE AS5756Symmetrical 4-Quad Split DCLow Inductance · Class 6 PUR

GP 28V DC SF 28 V DC Symmetrical Aircraft Ground-Power CableISO 6858 / SAE AS5756 28.5 V DC symmetrical 4×35 to 4×70 mm² (or 2×95 mm²) + pilot GPU

GP 28V DC SF Symmetrical Aircraft Ground-Power Cable splits the 28.5 V DC positive and negative poles into a balanced quad of four diametrically opposed Class 6 extra-flexible copper cores (4×35, 4×50, or 4×70 mm² — equivalent to 2×70, 2×100, or 2×140 mm²)

Oil-resistant
Ozone, UV & moisture
Anti-torsion braid
Flame-retardant
Order designation
GP 28V DC SF 4×50 + 1×4 mm² (= 2×100 mm²)
Outer Ø ≈
35.8 mm
Copper weight
1,960 kg/km
Total weight ≈
2,780 kg/km
Min. bend R (fixed)
179 mm
All sizes (6)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
System voltage
28.5 V DC
Symmetrical 4-core quad (+/+ and -/-)
Split configs
4×35 / 4×50
Equals 2×70, 2×100 & 2×140 mm² per pole
Pilot cores
1 to 4 × 1.5–4
Interstitial 28 V DC plug interlock
Loop inductance
-50 % vs. 2-Core
Diametrical star-quad cancellation
Outer jacket
Hi-Vis PUR / PCP
Jet-A1, Skydrol & de-icer resistant
Min. bend radius
5 × D
Motorized GPU reel & pantograph

Typical values for this cable type, based on ISO 6858 / SAE AS5756 (28.5 V DC Symmetrical Split-Phase GPU) — confirmed in the datasheet and quotation for your order.

Application fit

Is GP 28V DC SF right for your machine?

Engineered for motorized GPU cable reels, passenger boarding bridge (PBB) boom pantographs, and mobile 28.5 V DC start carts where a single compact, torque-balanced round cable is preferred over

Motorised monospiral reel

Suitable

True circular 4-core symmetry winds smoothly in single or multi-layer GPU drums without figure-8 twisting.

Self-supporting pendant & push-button drop

Suitable

30 % tighter bending radius than twin 1×120 mm² cables makes one-person NATO plug handling far easier.

Immersion & wet locations

Suitable

High-visibility Yellow or Orange PUR jacket resists Jet-A1 fuel, Skydrol, de-icing glycol, and rain.

Energy chain / drag chain

Suitable

Fits passenger boarding bridge (PBB) cable carriers and telescopic boom guides.

Typical machinesMotorized 28.5 V DC GPU reel unitsPassenger boarding bridge (PBB) boomsRegional jet, helicopter & turboprop gatesMilitary hangar & flight-line power pits

Construction

Layer by layer

Four main Class 6 extra-flexible copper cores (4×35, 4×50, or 4×70 mm², paired diagonally as 2×Positive Red and 2×Negative Black) plus 1

12345
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Class 6 extra-flexible copper quad +IEC 60228 Class 6 ultra-fine bare or tinned copper (4×35, 4×50, 4×70 mm² main +IEC 60228 Class 6 / ISO 6858
290 °C EPR / TPE-E core insulationArctic-grade cross-linked EPR or TPE insulation (diagonal Red+/Red+ and Black-/BlackSAE AS5756
3Inner elastomeric beddingExtruded shock-absorbing inner jacket locking the 4 main cores and interstitial pilotsISO 6858
4Anti-torsion reinforcing braidHigh-tenacity synthetic yarn braid preventing corkscrewing on motorized GPU reelsGPU reeling spec
5High-visibility PUR / PCP apron sheathAbrasion-, Jet-A1-, Skydrol-, and UV-resistant polyurethane (PUR) in Aviation Yellow orSAE AS5756 / EN 50363-10-2

GP 28V DC SF 4-Quad Split (4×35, 4×50, 4×70 mm² + Pilots)

Diametrically paired 4-core quad yielding 70 mm², 100 mm², or 140 mm² per DC pole in one supple round cable.

GP 28V DC SF 2-Core Symmetrical (2×70, 2×95, 2×120 mm² + Pilots)

2 main Class 6 cores + 2 split interstitial pilot/sense cores for standard 3-pin NATO GPU plugs.

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on ISO 6858 / SAE AS5756 (28.5 V DC Symmetrical Split-Phase GPU). Values for your order are confirmed in the datasheet and quotation.

Electrical

Nominal aircraft bus voltage
28.5 V DC (cable insulation rated 0.6/1 kV)
Effective pole cross-section
70 mm² (4×35) · 100 mm² (4×50) · 140 mm²
Effective DC pole resistance @ 20 °C
0.277 Ω/km (4×35) · 0.193 Ω/km (4×50) ·
Routine dielectric test voltage
3,000 V AC for 5 minutes
Max. conductor operating temp.
+90 °C continuous · +250 °C short-circuit

Thermal

Apron operating temp. range
-40 °C to +90 °C (dynamic reeling to -35 °C)
Cold flexibility
Remains supple on arctic aprons at -40 °C

Mechanical

Min. bending radius
4 × D static · 5 × D dynamic reeling
Reeling & torsional stability
Anti-torsion braid for motorized drum &

Resistance

Aviation fluid resistance
Jet-A1 / JP-8 fuel, Skydrol LD-4, hydraulic
Abrasion & tear resistance
Heavy-duty ether-based PUR per EN 50363-10-2

Reference standards

Primary specification
ISO 6858 · SAE AS5756 · IEC 60228 Class 6
Connector compatibility
3-pin 28 V DC NATO / AN2551 / MS25018 GPU

Identification

Core identification
2× Red (+28.5 V DC), 2× Black (0 V DC)
Outer sheath colour
High-Visibility Yellow (RAL 1021) or Orange

Sizes

6 standard configurations (GP 28V DC SF)

Nominal dimensions, copper weights, DC resistance and current ratings for GP 28V DC SF per ISO 6858 / SAE AS5756 (28.5 V DC Symmetrical Split-Phase GPU).

Dimensions & weights
Order designationCores × SizeMain cross-sectionOuter Ø ≈
mm		Copper
kg/km		Weight ≈
kg/km		Min. bend R
fixed mm		Enquiry
Standard GP 28V DC SF configurations
GP 28V DC SF 4×35 + 2×1.5 mm² (= 2×70 mm²)4×35 + 2×1.5 mm²70.0 mm² (2×35)31.21,3802,040156
GP 28V DC SF 4×50 + 1×4 mm² (= 2×100 mm²)4×50 + 1×4.0 mm²100.0 mm² (2×50)35.81,9602,780179
GP 28V DC SF 4×50 + 4×1.5 mm² (= 2×100 mm²)4×50 + 4×1.5 mm²100.0 mm² (2×50)36.21,9802,820181
GP 28V DC SF 4×70 + 1×6 mm² (= 2×140 mm²)4×70 + 1×6.0 mm²140.0 mm² (2×70)41.52,7503,760208
GP 28V DC SF 2×95 + 1×4 mm² Symmetrical2×95 + 1×4.0 mm²95.0 mm²36.41,8602,610182
GP 28V DC SF 2×120 + 2×2.5 mm² Symmetrical2×120 + 2×2.5 mm²120.0 mm²39.82,3503,210199
  • 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 ISO 6858 / SAE AS5756 (28.5 V DC Symmetrical Split-Phase GPU).

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
3.0 kV AC dielectric & insulation resistance3,000 V AC for 5 min between all main and pilot cores100 % of reels
Paired pole DC loop resistance & balance≤ 1 % resistance unbalance between parallel split cores100 % of reels
Sample tests
Motorized drum reeling & -40 °C cold flex testZero corkscrew deformation over 10,000 reel cyclesPer production batch
Jet-A1, Skydrol & de-icing fluid resistanceSAE AS5756 fluid immersion passType approval

Inspection certificate

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

Product approvals

ISO 6858 / SAE AS5756IEC 60228 Class 6CE / RoHS

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX GP 28V DC SF SYMMETRICAL AIRCRAFT
Delivery form
Non-returnable timber drums or heavy export
Standard drum lengths
250 m · 500 m · 1000 m · custom cut lengths
MOQ
100 m (stock variants) · 500 m (custom)
Lead time
2–4 weeks ex-works
Incoterms
EXW, FOB, CIF, DAP

Technical documents

Downloads

PDFGP 28V DC SF 28 V DC Symmetrical Aircraft Ground-Power Cable – technical datasheet6 sizes · construction, technical data, approvalsXLSXGP 28V DC SF spec data (Excel)All 6 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 split a 28.5 V DC GPU cable into 4×50 mm² instead of using 2×100 mm²?
By splitting the positive pole into two diagonally opposite 50 mm² cores and the negative pole into the other two 50 mm² cores (a 4-core star-quad), the cable achieves a much smaller, truly circular outer diameter (35.8 mm), flexes effortlessly in all directions on motorized reels, and cancels magnetic loop inductance by over 50 %.
Why does low loop inductance matter on a 28.5 V DC aircraft ground power cable?
When a turboprop or helicopter starter motor engages, current jumps from 0 A to 1,800 A in milliseconds (high dI/dt). Lower cable inductance (L·dI/dt) prevents transient voltage sag at the aircraft bus during starter engagement and reduces inductive arcing if a plug is disconnected under load.
How are the four main cores terminated inside a 3-pin 28 V DC NATO aircraft plug?
Inside the rear shell of a standard 3-pin 28 V DC NATO / AN2551 plug, the two diametrically opposite Red cores (e.g., 2×50 mm² = 100 mm²) crimp together into the Positive (+) main socket barrel, the two Black cores crimp into the Negative (-) barrel, and the interstitial pilot core terminates to the short interlock pin.
Is GP 28V DC SF suitable for motorized spring and electric GPU reels?
Yes. Unlike twin banded single-core cables that can twist over one another when wound onto a drum, the round double-sheathed GP 28V DC SF with its embedded synthetic anti-torsion braid is specifically engineered for motorized GPU cable reels and boarding-bridge pantographs. Each production drum

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GP 28V DC SF 28 V DC Symmetrical Aircraft Ground-Power Cable

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Reel & motion:
- Reel type: 
- Drum core diameter (mm): 
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