The r0 and Xo characteristics are similar to those obtained for the 350,000-circular mil 3-conductor underground cable, but the presence of the additional magnetic material of the armor wire greatly increased the current range over which the impedance varied. Since the current limit of the feeder test bus was reached during the test on this feeder before saturation of the steel tape and submarine armoring could be attained, the value of z0 picked for use in calculations involving this feeder length had to be obtained by extrapolation