A "terminal bar" used for the termination of equipment grounding conductors is shown here on the right side of this cabinet.
This cabinet encloses a panelboard, and is usually called a "subpanel," and the panelboard's grounded conductor (neutral concuctor with the white identification) is "isolated" or "floating from the metal cabinet, or so called "can" and the EGC terminal is "BONDED" to the can.
This is a "terminal bar" and this is where the EGC's are to be secured under each terminal, some of which may only allow two of the same size per terminal.
The panelboard cover will include this information.
408.20 Grounding of Panelboards.
Panelboard cabinets and panelboard frames, if of metal, shall be in physical contact with each other and shall be grounded.
Where the panelboard is used with nonmetallic raceway or cable or where separate grounding conductors are provided, a terminal bar for the grounding conductors shall be secured inside the cabinet.
The terminal bar shall be bonded to the cabinet and panelboard frame, if of metal; otherwise it shall be connected to the grounding conductor that is run with the conductors feeding the panelboard.
[This message has been edited by Joe Tedesco (edited 03-31-2005).]