200.2(b)

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augie47

augie47

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Cutler-Hammer, and perhaps some other manufacturers, have a panel (BR) series where the left hand "ground-neutral" bar is bonded to the can by a 8-32 screw at the end of a "bond strip" that extends just short of the right hand bar.
If the panel is a service panel, the bond jumper can be installed using the same 8-32 screw.
With the bond jumper in place, you have a path thru the bond jumper to the "strip" held in place by the 8-32 screw into the panel enclosure.
I have found no indication that the left hand bar is "grounding" only and often grounded conductors are connected there.
It has long been a concern but apparently no violation.
With the addition of 200.2(B) to the '08 Code, do you see it as a violation to use the left bar for grounded connections ?
 
If the can is truly relying on the enclosure for continuity then I agree the grounded conductor cannot be on the right hand side.
 
fine line Dennis... The continuity is depending on the "foot" of the bonding jumper being held against the "strip". That is accomplished by the screw.
As long as the screw is tight, there is continuity.

(B) Continuity. The continuity of a grounded conductor shall not depend on a connection to a metallic enclosure, raceway, or cable armor.

I can read into it either position :grin:
 
augie47 said:
fine line Dennis... The continuity is depending on the "foot" of the bonding jumper being held against the "strip". That is accomplished by the screw.
As long as the screw is tight, there is continuity.

(B) Continuity. The continuity of a grounded conductor shall not depend on a connection to a metallic enclosure, raceway, or cable armor.

I can read into it either position :grin:
Click to expand...

Trying to follow you here.

Is the screw to the enclosure or the buss?

PS is it an 8-32 or a 10?
 
augie47 said:
Cutler-Hammer, and perhaps some other manufacturers, have a panel (BR) series where the left hand "ground-neutral" bar is bonded to the can by a 8-32 screw at the end of a "bond strip" that extends just short of the right hand bar.
If the panel is a service panel, the bond jumper can be installed using the same 8-32 screw.
With the bond jumper in place, you have a path thru the bond jumper to the "strip" held in place by the 8-32 screw into the panel enclosure.
I have found no indication that the left hand bar is "grounding" only and often grounded conductors are connected there.
It has long been a concern but apparently no violation.
With the addition of 200.2(B) to the '08 Code, do you see it as a violation to use the left bar for grounded connections ?
Click to expand...

I have use the panels you speak of very often. I see no violation of 200.2 B. That strip is connected to both bars with the service grounded conductor landing on the right bar. If I use the panel as a sub-panel I remove the bonding strip using the right as the grounded bad and the left for the grounding.
 
Sorry I was under the impression that the bonding screw in the grounding bar was connecting the bar to the enclosure. I see nothing that says the screw cannot be used however I wonder if that was the intent.
 
Try this:

On the right you will see the green screw at the end of the "strip".
This screw bods the left bar to the enclosure.
In the event it's a service panel, there is a jumper there also.


View attachment 5176
 
here is another one

CHPanel.jpg
 
Looking at the photo the two bars are attached by the buss. However this is dependant on the connection of the metallic enclosure. It appears to be a violation.
I looked at a CH 225 amp which had a cross over bar that was connected directly to each bar, then the bonding jumper was independant to the can. This would be OK per 200.2 B
 
I don't see that as having the electrical connection to the left bar as being dependent on the metallic enclosure. If you remove the copper jumper then it would be. The code rule was to prevent using the enclosure itself as the path for the grounded conductor current.
 
I don't see the problem either however I would land all my neutrals on the right hand side and leave the grounds on the left. In either case I don't see how the left side is using the enclosure. The bond screw is used to hold the copper to the buss that is not the same as using the enclosure.

A whole different issue but who wired that feed to the panel--- yuk. Hope those wires are protected by a smaller breaker on the other end. :grin: And why is the ground connected to the neutral bar?
 
residential fire pump

residential fire pump

i understand the code from service conductors to fire pump controller, what about froom controller to pump wiring method
 
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