250.130(C) Nongrounding Receptacle Replacement or Branch Circuit Extensions.
The equipment grounding conductor of a grounding-type receptacle or a branch-circuit extension shall be permitted to be connected to any of the following:
- (1)
Any accessible point on the grounding electrode system as described in 250.50- (2)
Any accessible point on the grounding electrode conductor- (3)
The equipment grounding terminal bar within the enclosure where the branch circuit for the receptacle or branch circuit originates- (4)
An equipment grounding conductor that is part of another branch circuit that originates from the enclosure where the branch circuit for the receptacle or branch circuit originates- (5)
For grounded systems, the grounded service conductor within the service equipment enclosure- (6)
For ungrounded systems, the grounding terminal bar within the service equipment enclosure