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1910.304(b)(2)(iv)(A)
Where a grounding means exists in the receptacle enclosure or a grounding conductor is installed, grounding-type receptacles shall be used and shall be connected to the grounding means or conductor;
1910.304(b)(2)(iv)(B)
Ground-fault circuit-interrupter protected receptacles shall be provided where replacements are made at receptacle outlets that are required to be so protected elsewhere in this subpart; and
1910.304(b)(2)(iv)(C)
Where a grounding means does not exist in the receptacle enclosure, the installation shall comply with one of the following provisions:
1910.304(b)(2)(iv)(C)(1)
A nongrounding-type receptacle may be replaced with another nongrounding-type receptacle; or
1910.304(b)(2)(iv)(C)(2)
A nongrounding-type receptacle may be replaced with a ground-fault circuit-interrupter-type of receptacle that is marked "No Equipment Ground;" an equipment grounding conductor may not be connected from the ground-fault circuit-interrupter-type receptacle to any outlet supplied from the ground-fault circuit-interrupter receptacle; or
1910.304(b)(2)(iv)(C)(3)
A nongrounding-type receptacle may be replaced with a grounding-type receptacle where supplied through a ground-fault circuit-interrupter; the replacement receptacle shall be marked "GFCI Protected" and "No Equipment Ground;" an equipment grounding conductor may not be connected to such grounding-type receptacles.

Related Code Sections

1910.304(b)(2) Electrical, Receptacles and Cord Connectors
; Ground-fault circuit-interrupter protected receptacles shall be provided where replacements are made at receptacle outlets that are required ...