CC and CCT covered overhead conductors are similar in design. Both types have individual conductors covered with cross-linked polyethylene (XLPE) insulation.
The main difference between CCT and CC is that in CCT, the insulation thickness varies according to the voltage level and conductor size, and it also has an outer jacket made of heavy-duty polyethylene (HDPE).
CC conductors are designed to withstand only short-term or accidental two-phase or phase-to-ground contacts, whereas CCT conductors can provide adequate insulation for long-term two-phase or phase-to-ground contacts.
XLPE is a polyethylene in which the molecules are cross-linked (forming X-shaped bonds). After being processed in a steam chamber under high temperature and pressure, the cross-linking of the molecular chains is enhanced.
CCT overhead cable conductors are made of compact ACSR or AAAC.