mbruchs
May 13, 2015, 5:00am
1
Should the ground buss have a bonding strap installed in this 100 amp General Electric sub panel?
jhutchings
May 13, 2015, 7:27am
2
The ground buss is always unbonded from the neutral buss in a sub panel. I hope that is the answer you were looking for.
jpope
May 13, 2015, 1:36pm
3
Yes. The grounding terminal is required to be bonded to the enclosure. There should be a bonding strap or bonding screw installed on the grounding terminal.
rmeier2
May 13, 2015, 2:19pm
4
The bus on the far left is being used for the connection of all the EGC’s, that should be bonded to the enclosure.
Jim_Port
May 13, 2015, 2:53pm
5
This is not always true. Older editions of the NEC allowed three wire feeders to detached building with no metallic path between buildings.
jhutchings
May 13, 2015, 4:14pm
6
I did not know that. I learn something new everyday. Sorry for my misinformation.
rmeier2
May 13, 2015, 4:53pm
7
No reason to apologize because as you’ve stated under the last few code cycles your original statement was correct. Jim provided a useful exception that you may encounter in the field when inspecting older installations.
rlewis5
May 13, 2015, 5:06pm
8
Jim
rmeier2
May 13, 2015, 5:32pm
9
It changed under the 2008 NEC which eliminated the exception for new installations.
2005 NEC:
250.32(B)(2) Grounded Conductor Where (1) an equipment grounding conductor is not run with the supply to the building or structure, (2) there are no continuous metallic paths bonded to the grounding system in each building or structure involved, and (3) ground-fault protection of equipment has not been installed on the supply side of the feeder(s), the grounded conductor run with the supply to the building or structure shall be connected to the building or structure disconnecting means and to the grounding electrode(s) and shall be used for grounding or bonding of equipment, structures, or frames required to be grounded or bonded.
2008 NEC:
250.32(B) Grounded Systems. For a grounded system at theFor existing premises wiring systems only, the
jhutchings
May 13, 2015, 5:34pm
10
Deleted because answer above.
jhutchings
May 13, 2015, 5:37pm
11
Thanks Robert because I too had wondered.
