Doug:
I just checked the 1981 NEC (Handbook) and 250.95 is verbatum to what Greg inserted above, without the following:
"Where the overcurrent device consists of an instantaneous trip circuit breaker or a motor short-circuit protector, as allowed in Section 430-52, the equipment grounding conductor size shall be permitted to be based on the rating of the motor overload protective device but not less than the size shown in Table 250-95."
Table 250.95 is identical.
I have older NECs at the work office, I'll attempt to remember to check it as far back as I can Fri. (I hope)
