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T/F: AAAC vs AAC conductivity

Short answer

FALSE. AAC has higher electrical conductivity (≈61% IACS) than AAAC (≈53% IACS) because alloying elements reduce conductivity; AAAC is mechanically stronger but inferior in conductivity.

State whether the following statement is TRUE or FALSE. Justify your answer with a brief explanation: The AAAC is superior to the AAC in terms of electrical conductivity.

FALSE.

  • AAC (All Aluminium Conductor) is made of pure electrical-grade aluminium (EC grade, 1350). Its conductivity is about 61% IACS, with resistivity about 0.0283 Ω·mm²/m.
  • AAAC (All Aluminium Alloy Conductor) uses an Al–Mg–Si alloy (6201). The alloying elements raise its strength but lower its conductivity to about 52.5–53% IACS, with resistivity about 0.0328 Ω·mm²/m. For the same cross-section, AAAC has about 15% more resistance.
PropertyAACAAAC
ConductivityHigher (≈61% IACS)Lower (≈53% IACS)
Tensile strengthLowAbout twice AAC
Sag / spanLarge sag, short spansSmaller sag, longer spans
UseShort urban spans, substationsDistribution and transmission, coastal areas

AAAC is superior to AAC in mechanical strength, hardness and sag performance, not in electrical conductivity.

✓ Answer checked by Claude Opus 5.5 (high effort)

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