An essential step in the development of quantum Hall devices for ac metrological standards is the frequency characterisation of multiconductor resistances [1]. The needed resistance values would require the use of rather long wires; a proposed solution consists in folding the wire into multiconductor geometries. In this work we present an accurate modeling of a quadrifilar resistance in the range 0–10 kHz, using a transmission-line approach. Capacitances were obtained with a version of the Boundary Element Method optimised to treat very different length scales; inductances, eddy currents and skin effects are computed through analytical formulae paying special attention to the singularities occurring in the problem.