:wall:grounding of main panels and subpanels

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Old 02-19-10, 09:56 AM
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:wall:grounding of main panels and subpanels

Hey guys, I just read something on another post and am confused. What is the correct method for grounding your panel itself to the ground or neutral bus? I've seen this both ways and I've always grounded to the grounding bus but both busses are connected anyway.
 
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Old 02-19-10, 10:14 AM
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The ground and neutral bond depends on whether the panel is the service panel (first one after the meter that houses the main disconnect) or a subpanel; and also if is it located in the same building as the service panel. In any case however, the panel box itself is always connected solidly to the ground bus inside the panel.
 
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Old 02-19-10, 10:25 AM
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Thanx, IP. so what you're saying is the neutral and ground busses are connected in the service panel but not connected in the sub-panel?
 
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Old 02-19-10, 10:32 AM
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On a sub panel you need to remove the jumper bar to isolate the nutrual bus from the ground bus. Both buses will then be mounted only on the unsulators without any contact to the panel therefore the ground bus will then have to be grounded to the panel. Most panel manufacturers will supply a seperate green screw that will be used to screw through the ground bus into the panel. If the subpanel is located in a seperate structure I believe a ground rod will be required.
 
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Old 02-19-10, 12:02 PM
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Originally Posted by butcho View Post
Thanx, IP. so what you're saying is the neutral and ground busses are connected in the service panel but not connected in the sub-panel?
Yes that is correct. However, there are subpanels in outbuildings where ground and neutral are connected. It's not legal anymore as of 2008 code, but there are many grandfathered installations out there you might see in your travels.
 
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Old 02-19-10, 02:02 PM
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As always, Lots of good information.
Thanx again
 
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Old 02-19-10, 08:46 PM
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Originally Posted by ibpooks View Post
Yes that is correct. However, there are subpanels in outbuildings where ground and neutral are connected. It's not legal anymore as of 2008 code, but there are many grandfathered installations out there you might see in your travels.
It's also interesting to note that the 2008 code has not been universally accepted. Many areas are still under the 2005 or earlier codes.
 
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