2.) A grounding electrode conductor that is attached to the grounded conductor or equipment grounding terminal bar of a remote panelboard.
Section 250-24 (a) requires that a premises wiring system, which is supplied by an ac service that is grounded to have, at each service, a grounding electrode conductor connected to a grounding electrode that complies with Part C of Article 250. The grounding electrode conductor must be connected to the grounded conductor (neutral) and it can be connected at any accessible location from the load end of the service drop or lateral to the grounded conductor bus or terminal at the service disconnect.
Example: a single family dwelling that has an attached garage. There is a 200 ampere main disconnect located in the garage and a 4/0 aluminum SER Cable has been run to a panelboard located in the basement. A grounding electrode conductor has been attached to the metal water pipe feeding the dwelling and run to the panelboard located in the basement. The grounding electrode conductor has been terminated on the grounded conductor (neutral) or equipment grounding bus of the panelboard. This panelboard, being a remote panelboard, has been supplied by a feeder and is not part of the service. Therefore, the grounding electrode conductor should have been run to the 200 ampere service disconnect in the garage.