Covered Conductors and their development

“Covered conductors consist of a conductor surrounded by a covering made of insulating material as protection against accidental contacts with other covered conductors and with grounded parts such as tree branches, etc..” –  Definition from CENELEC, Europe.

CCT (Covered Conductor Thick) has a specified covering thickness for each of the nominated working voltages. While still required to operate under similar principles to a bare wire or CC system, they have electrical and mechanical characteristics which permit them to remain in contact with tree limbs for an extended period dependent on abrasive characteristics of the tree, frequency and strength of prevailing winds and operating temperature. CCT shows better performance in polluted environments than bare wire systems. They are suitable for use in ‘spacer cable’ and similar systems.

Nexans Olex CCT cables comply with AS/NZS 3675, including the UV/Weathering test that is often overlooked in competitor products. Nexans Olex’s CCT has withstood extended periods of time exposed to UV rays in all parts of Australia without failure of the covering. The conductors are aluminium alloy 1120 which is 40- 50% stronger than standard aluminium covered with a track resistant UV stabilised Grey coloured XLPE or with an inner layer of non-UV stabilised XLPE, and an outer layer of Black UV stabilised High Density Polyethylene (HDPE) for even greater resistance to damage. 

Nexans Olex CCT is water blocked with a special material, formulated from extensive research in materials and processing techniques, to prevent entry of water into the conductor longitudinally while the covering prevents radial water entry. 

Nexans Olex CCT meets all the requirements of AS/NZS 3675, including the very arduous UV/Weathering test and has been successfully operating in the Australian market for more than 20 years.

To learn more about Nexans Olex CCT cables, dial 1300 CABLES or send us an email to