A 480/120 VAC step-down control transformer is configured as shown in figure "E" of the illustration. When 480 VAC is applied to the primary winding (across H1 and H2), an output of 141 VAC is produced across the secondary winding (across X1 and X2). Although the fault may ultimately result in a catastrophic failure, what hypothetical fault condition is indicated that would account for these voltages? Illustration EL-0123