If the calculated fault X/R is not greater than the circuit breaker test X/R, then Iadjsym can be set equal to Lyn, in step 1156. It can then be determined if the device rating is greater than or equal to Iadjsym in step 1146. The pass/fail determinations can then be carried out in steps 1148 and 1150 respectively, and the percent rating can be determined in step 1152.