an electrical cable system and a method for manufacturing an electrical cable system has an electrical cable containing a conductor core . the method for installing the electrical cable system of a longitudinally expandable contractible element includes disposing a secondary element over the electrical cable so as to give the electrical cable substantially attached undulations forming an additional length . the electrical cable system is installed by clamping at least at two points to the longitudinally expandable - contractible elements . the secondary element is handled after the clamping so as to release the attachment of the undulations thereby converting the additional length into a free to be used excess length .