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A new geometrical model has been implemented in the THELMA code, aiming at permitting the study of multi-stage, forced-flow cable-in-conduit conductors with rectangular crosssection, like that proposed for the TF magnets of the future fusion reactor DEMO. This model gives verisimilar strands trajectories which should enable the adoption of a more detailed interstrand electrical contact model. The paper shows the results of the first application of these code new features to a set of contact resistance and AC losses experiments carried out by Twente University on a DEMO TF prototype conductor. The results of this analysis present some unforeseen aspects that need further work to be fully understood, to improve and validate the model.

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