If the fault X/R is not greater than the circuit breaker test X/R then Iadjintsym can be set equal to Lyn, in step 1174. If the calculated fault X/R is greater than the circuit breaker test X/R, then contact parting time for the circuit breaker can be determined in step 1176 and equation 15 can then be used to determine Iadjintsym in step 1178.