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How to Recognize a "Terminal Bar" #85259
06/14/03 06:22 AM
06/14/03 06:22 AM
Joe Tedesco  Offline OP
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
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.

Quote
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).]


Joe Tedesco, NEC Consultant
2017 / 2014 NEC & Related Books and Study Guides
Re: How to Recognize a "Terminal Bar" #85260
06/14/03 07:13 AM
06/14/03 07:13 AM
I
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
Joe, if someone needs to look at the cover on the panel in order to "recognize a terminal bar" and determine which is for the grounding conductors and which is for the grounded conductors do you think they should be in the panel in the first place?

Not to say the labeling is unimportant but this is some basic electrical knowledge.

Bob


Bob Badger
Construction & Maintenance Electrician
Massachusetts
Re: How to Recognize a "Terminal Bar" #85261
06/14/03 07:19 AM
06/14/03 07:19 AM
R
Roger  Offline
Member
Joined: May 2002
Posts: 1,716
N.C.
What is the black wire connected to the white wire? If this is a shunt trip the colors are not right.

Roger

Re: How to Recognize a "Terminal Bar" #85262
06/14/03 07:34 AM
06/14/03 07:34 AM
Joe Tedesco  Offline OP
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
iwire

Exactly, I posted this message and the images from my gallery just for that reason because some people are not sure of what was meant by a "terminal bar" and with 408.20 in mind this is offered to clear up the confusion.

Too many are under the impression that the rules for boxes in 250.148 is applied in a panelboard!


Joe Tedesco, NEC Consultant
Re: How to Recognize a "Terminal Bar" #85263
06/15/03 08:53 AM
06/15/03 08:53 AM
Joe Tedesco  Offline OP
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
Roger:

I didn't notice that!

Thanks for the reminder!


Joe Tedesco, NEC Consultant
Re: How to Recognize a "Terminal Bar" #85264
06/15/03 09:15 AM
06/15/03 09:15 AM
R
Roger  Offline
Member
Joined: May 2002
Posts: 1,716
N.C.
Joe, I know I got off topic, but it just caught my eye. [Linked Image]

Roger

Re: How to Recognize a "Terminal Bar" #85265
06/15/03 01:02 PM
06/15/03 01:02 PM
G
Gwz  Offline
Member
Joined: Apr 2002
Posts: 197
I am in agreement with iwires post of 06-14-2003-08:13AM.

It is apparent that many electrical people, including electrical inspectors, do not know the various terminal bars in Service Equipment, or Panelboards supplied by Feeders.

Some seem to know when it is in diagram(s) of circuit(s) but when looking into a panelboard full of wiring they are "lost" as to the identification of the various terminal bars.

Re: How to Recognize a "Terminal Bar" #85266
06/15/03 03:07 PM
06/15/03 03:07 PM
E
Elzappr  Offline
Member
Joined: Dec 2001
Posts: 270
Oregon
Thanks for the clarification, Joe.
Now, all we need is more exact wording, e.g., "..one or more terminal bars for terminating all non-isolated grounding conductors shall be secured inside the cabinet." This would better represent the actual practice of using multiple terminal bars, as well as specify the apparent intent of landing ALL the non-isolated equipment grounding conductors at the terminal bar.
Anyone have easy access to a panelboard cover that has specific wording that EGC's have to land on the terminal bar? Or, does the wording just specify that the bar is provided for the EGC's (with no mandatory usage implied)?

Re: How to Recognize a "Terminal Bar" #85267
06/15/03 06:32 PM
06/15/03 06:32 PM
R
Redsy  Offline
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA
OK, I can't resist any longer...
How do you recognize a terminal bar?
By the drunks waiting for their flight!

Re: How to Recognize a "Terminal Bar" #85268
06/15/03 07:59 PM
06/15/03 07:59 PM
R
Roger  Offline
Member
Joined: May 2002
Posts: 1,716
N.C.
LOL Redsy, bless your heart, it's obvious you held that in as long as you could. [Linked Image]

Roger


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