Introduction There is an increasing demand for cable integration in the networks. It is now well known that underground and submarine transmission cables have significantly different electrical characteristics than overhead lines, and that these differences must be taken into account during cable system planning, design, and operation. The Brochure provides a state of the art in cable electrical modelling. Scope The Brochure deals with cable systems for land and submarine AC applications, with a nominal voltage above 45 kV. Paper cables (MI, SCFF and HPFF) as well as extruded cables are considered. Description of the TB The Brochure focuses on the derivation of the impedances of cable systems from cables characteristics and links arrangements (including laying conditions and screen bonding techniques). Theoretical expressions and measurement techniques of electrical parameters are presented. A critical analysis is carried out to define the applicability of the models and needs in further studies are highlighted.