200 – Use and Identification of Grounded Conductors

200.10(B) – Identification of Terminals

Reason for Change:

The means of identification of the grounded conductor terminals or screws for such things as receptacles can now be achieved by a metal or metal coating that is not only substantially white in color, but “substantially silver” in color as well.

200.10 Identification of Terminals.

(B) Receptacles, Plugs, and Connectors. Receptacles, polarized attachment plugs, and cord connectors for plugs and polarized plugs shall have the terminal intended for connection to the grounded conductor identified as follows:
(1) Identification shall be by a metal or metal coating that is substantially white or silver in color or by the word white or the letter W located adjacent to the identified terminal.
(2) If the terminal is not visible, the conductor entrance hole for the connection shall be colored white or marked with the word white or the letter W.
Informational Note: See 250.126 for identification of wiring device equipment grounding conductor terminals.

200.3 – Connection to Grounded System

Reason for Change:

The grounded conductors of premises wiring systems are required to be electrically connected to the supply system grounded conductor. This applied to all premises wiring, not just interior wiring.

200.3 Connection to Grounded System.

Premises Grounded conductors of premises wiring systems shall not be electrically connected to a the supply system unless the latter contains, for any grounded conductor of the interior system, a corresponding conductor that is grounded to ensure a common, continuous grounded system. For the purpose of this section, electrically connected shall mean connected so as to be making a direct electrical connection capable of carrying current, as distinguished from connection through electromagnetic induction induced currents.
Exception: Listed utility-interactive inverters identified for use in distributed resource generation systems such as photovoltaic and fuel cell power systems shall be permitted to be connected to premises wiring without a grounded conductor where if the connected premises wiring or utility system includes a grounded conductor.