Article 517 was named 'Health Care Facilities' in 1971, and basically took the form it is in today. Before that, it was called 'Flammable Anesthetics', and very short.
1971 517.51(b)(3) "A separate, insulated, continuous, stranded, copper grounding conductor, not smaller than No. 12 AWG, shall be installed with the circuit conductors in the approved wiring system which connects each patient receptacle including the receptacle grounding terminal to the same patient reference grounding bus. . ."
Close, but may not be what you need.
1975 517-51(b)(1) "Each patient bed location shall be provided with a minimum of four single or two duplex receptacles, each receptacle shall be grounded by means of an insulated copper conductor sized in accordance with Table 250-95. . ."
Tha would prohibit almost all NM, but NM and NMC were permitted to contain an insulated grounding conductor that year 336-2.
NM was specifically allowed by exception No. 2 to Section 517-11(a) to have the EGC be uninsulated in Clinics, Dental Offices, Outpatient Facilities, Nursing Homes, and Residential Custodial Care Facilities in 1981.
You would have to be subject to the 1990 or newer cycle to find that exception disappear.
So 1990 is when it was not allowed at all in any Patient Care Area.
