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 Aluminium Conductor Composite Core or ACCC is a type of "high-temperature low-sag" (HTLS) overhead power line conductor.
It is able to carry approximately twice as much current as a conventional aluminium-conductor steel-reinforced cable (ACSR) cable of the same size and weight,making it popular for retrofitting an existing electric power transmission line without needing to change the existing towers and insulators.
In addition to the labor and materials savings, such an upgrade can be performed as a "maintenance and repair" operation, without the lengthy permitting process required for new construction.

It does this by replacing the steel core in ACSR cable with a carbon and glass fiber strength member[4]:2 formed by pulltrusion. This composite strength member provides several advantages:
It is lighter. The weight saved can be used for more aluminium conductor. ACCC cable uses trapezoidal strands to fit more aluminium into the same cable diameter.
Softer, fully annealed aluminium can be used for the conductors. ACSR cable uses harder aluminium which contributes to the cable's tensile strength, but has about 3% less electrical conductivity.[4]:12
It has a much lower coefficient of thermal expansion (CTE) (1.6 ppm/°C) than ACSR (11.6 ppm/°C).[5]:23 This lets the cable be operated at a significantly higher temperature without excessive sag between poles.

CTSS`S ACCC condcutor has been exported to Africa and put into service since 2013 .