[en] The hollow cable conductor adopted by Westinghouse for the Large Coil Program (LCP) model coil consists of a bundle of triplex conductor strands which are initially encased in a circular pipe, but the pipe is subsequently compacted into a square shape. The void, void size, and helium flow distributions among the interstices and subchannels of the conductor affect the conductor cooling, the helium pump work and the refrigeration load. However, there does not exist any experimental or theoretical work that deals with this problem. An analysis was therefore carried out to study the effect of void sizes on the stability of the conductor and the helium pump work required. This work is reported in this paper