When did grounding-type receptacles and ground fault circuit interrupters first make their appearance in the National Electrical Code (NEC)?
Ground-fault protection was first required in 1968 for underwater lighting in swimming pools. GFCIs were required for outdoor receptacles in 1973 (the requirement appeared in the 1971 edition with an effective date of 1/1/1974); for bathrooms, 1975. Other locations were required in different editions. Grounding-type receptacles were required for all 15- and 20-ampere receptacle outlets appears in the 1971 edition with an effective date of January 1, 1974.
