The change your referring to I believe was part of the 96 NEC but don't have a copy in front of me right not to verify if this is the proper addition.
A neutral (grounded conductor) has always been installed as part of range and dryer circuits but it was also permitted to be used for grounding the frame of the range or dryer. New installations are now required to have an equipment ground wire run with the circuit. 250-140 (2002 NEC)
Curt
