By TEBAOFLEX Jyen. Originally published on February 9, 2026.
Start with the aircraft interface, not the cable core count
Aircraft ground power requires the correct voltage, frequency, connector and protective functions at the aircraft interface. ISO 6858:2017 addresses nominal 28 V DC and 115/200 V or 230/400 V three-phase 400 Hz supplies measured at the aircraft attaching connector. SAE AS5756 separately covers 600 V heavy-duty portable power cable for severe flexing. Neither reference, by itself, proves a particular cable assembly is accepted for an aircraft.
For a 270 V DC system, obtain the aircraft and ground-equipment requirements rather than assuming that every installation uses a ±135 V bipolar arrangement. Confirm polarity, return and protective connections, current duty, interlocks and any voltage sensing from controlled interface drawings.
Why conductor geometry matters at 400 Hz
Inductive reactance is X = 2πfL. If inductance is unchanged, increasing frequency from 50 Hz to 400 Hz multiplies reactance by eight. AC resistance also depends on conductor arrangement, skin and proximity effects, and temperature; it cannot be assigned a universal percentage increase.
A seven-power-core construction can split each phase into two parallel conductors around a neutral. Appropriate geometry can reduce loop inductance, but it does not eliminate all magnetic fields or establish a fixed 72% saving. Use measured or validated impedance at 400 Hz for the actual connected assembly. Parallel conductors also require correct connections and an assessment of current sharing.
Hypothetical voltage-drop comparison
For a balanced three-phase load, an approximate in-phase line-to-neutral drop is ΔV_LN = I × length × (R cosφ + X sinφ), where R and X are per-phase values per unit length. For this illustration only, assume 260 A, a one-way length of 0.030 km and cosφ = 0.85, giving sinφ ≈ 0.526783.
Assumed cable A has R = 0.380 Ω/km and X = 0.420 Ω/km: ΔV_LN ≈ 4.245 V. Assumed cable B has R = 0.305 Ω/km and X = 0.088 Ω/km: ΔV_LN ≈ 2.384 V. Under the same balanced approximation, multiply each result by √3 to compare line-to-line drops: about 7.353 V and 4.129 V respectively.
These are hypothetical inputs, not measured TEBAOFLEX cable data. A 4.245 V steady-state calculation cannot be relabelled as a 14.8 V transient. The approximation excludes connector losses, unbalance, harmonics, source regulation and dynamic load response. Verify actual aircraft-terminal performance under the specified tests before making an acceptance claim.
Thermal, mechanical and apron-fluid duties
Specify continuous current separately from a starting pulse and its duration/repetition. Check cable-on-reel temperature, ambient conditions, neutral loading, connector rating and protective coordination. A cable sized for an unreeled condition may not have the same capacity while stored on a drum.
Define cold handling, reel geometry, dragging, abrasion and vehicle-crossing exposure. Obtain compatibility evidence for the particular hydraulic fluid, fuel, de-icer and cleaning agent at the relevant concentration and temperature. A generic PUR, PVC or rubber description cannot establish that a jacket is Skydrol-proof or that an alternative will fail within weeks.
Interlock and voltage-sense circuits are functions of the complete GPU and connector system. Use the approved pinout and commissioning sequence; do not retrofit a generic pilot-core arrangement or assume that a pilot loop removes every disconnect-under-load hazard.
ARINC 429 is a separate avionics selection
ARINC 429 defines a data-transfer interface, not a ground-power cable. Select its shielded pair, connectors and installation from the aircraft or equipment approval. Manufacturer catalogues include application-specific ARINC 429 cables with differing nominal impedance descriptions; a single 78±5 Ω assertion is not a substitute for the controlled specification.
ARINC 429 and MIL-STD-1553 have different interfaces and topologies. Similar cable impedance does not make harnesses interchangeable. Confirm conductor, dielectric, shielding, capacitance, attenuation and fire-performance requirements independently, and obtain traceable approval evidence before substituting an industrial data cable or claiming airworthiness.
Sources and application documentation
Discuss the application
Send the application duty, installation drawing and required acceptance criteria to TEBAOFLEX. WhatsApp: +86 185 9591 3361. Request the applicable product documentation before ordering.