[en] Several tests have been performed on Nb/sub 3/Sn cable-in-conduit conductors in an effort to define the stability margin of the conductor to be used in the Westinghouse Large Coil Program (LCP) coil. One of the test conductors contained a 6*3/sup 4/ Nb/sub 3/Sn cable almost identical to the final LCP design; only the void fraction was different. It was not possible to quench this conductor at the limits of the test facility, 20 kA and 8-T applied field. Supporting tests were performed on smaller conductors: one of similar construction but with one-third as many composite strands and one that contained only one triplex of composite strands. Tests on both these conductors indicate that the full-size conductor should indeed have been stable against much higher energies than we were able to inject. This magnet is for fusion applications. 7 refs