Box bonding pigtails needed?

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dielectricunion

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Im eventually Rewiring a small single family residential,- it will be all EMT. Im going to go with a separate EGC.

Is there any reason to tie the EGC to a box pigtail?

I'd imagine not since the redundant ground isn't required and the devices will be bonded via yoke.
 
I agree with Bob and if there is a receptacle that would require a grounding pigtail or the device would need to be self grounding. Switches can be grounded by the two 6-32 mounting screws.
 
The reason I was unsure is because if the EGCs are connected to the switches, receptacles, etc, and those are bonded to the box and conduit through yoke and screws, isn't it all electrically continuous?

Obviously, code is not just "will it work?".

I just thought that since an all metallic raceway system doesn't typically require separate EGC to be grounded, adding one would be going beyond code and not add additional requirements
 
dielectricunion said:
The reason I was unsure is because if the EGCs are connected to the switches, receptacles, etc, and those are bonded to the box and conduit through yoke and screws, isn't it all electrically continuous?

Obviously, code is not just "will it work?".

I just thought that since an all metallic raceway system doesn't typically require separate EGC to be grounded, adding one would be going beyond code and not add additional requirements
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This is one of those gotcha areas, like ground electrodes, where if you do more than what the code requires, those added elements must still meet code requirements in their own right.
 
GoldDigger said:
This is one of those gotcha areas, like ground electrodes, where if you do more than what the code requires, those added elements must still meet code requirements in their own right.
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That's what I was thinking. With the company I work for (im pretty new), we have been rewiring a nursing home, running EMT. We haven't been bonding any boxes to EGC per my boss. They never seem to bother bonding metal boxes, even when running romex j boxes.
 
dielectricunion said:
That's what I was thinking. With the company I work for (im pretty new), we have been rewiring a nursing home, running EMT. We haven't been bonding any boxes to EGC per my boss. They never seem to bother bonding metal boxes, even when running romex j boxes.
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In a hospital environment where a wire EGC is run specifically to be either an isolated or redundant ground, you may actually be prohibited from bonding that wire EGC to boxes along the way. Not familiar with that environment, and a nursing home is not a hospital, but some "standard practices" may have carried over.
 
GoldDigger said:
In a hospital environment where a wire EGC is run specifically to be either an isolated or redundant ground, you may actually be prohibited from bonding that wire EGC to boxes along the way. Not familiar with that environment, and a nursing home is not a hospital, but some "standard practices" may have carried over.
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Is there an actual code requirement for isolated grounds to be isolated or is this purely a design consideration?
 
infinity said:
Is there an actual code requirement for isolated grounds to be isolated or is this purely a design consideration?
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The description of isolated ground suggests that the ground wire terminates at the main bond at the service panel, but it does not explicitly state that it cannot bond to anything else along the way.
If the isolated ground outlet is on a single outlet dedicated circuit, I can see a reasonable argument that it not touch anything else along the way.
 
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