AAC is used mainly in urban areas where the spacing is short and
the supports are closer together. The advantage of AAC conductors
is that they have a high degree of corrosion resistance; for this
reason they are used extensively in coastal areas. AAC Conductors
were developed as a consequence of the galvanic corrosion that ACSR
conductors are susceptible to.
AAAC is used as bare overhead conductor for power transmission and
distribution lines on aerial circuits that require larger
mechanical resistance than AAC. AAAC also has better sag
characteristics and a better strength to weight ratio than AAC.
AAAC Cables have lower weight per unit length and slightly lower
resistance per unit length than ACSR.
The higher strength ACSR conductors are used for river crossings,
overhead earth wires, and installations involving extra long spans.
The advantage of ACSR is that it has high tensile strength and is
lightweight, which means over longer spans it needs less supports.
ACSR is available with varying percentages of steel core to achieve
different strengths. One of the advantages of this conductor in
particular is that the desired strength can be achieved without a
loss of ampacity.
