sub panel bonding

[hhsting]

Please see attached sub panel which shows conductor going from equipment grounding bus bar to sub panel enclosure frequently. Just how does one size it if it were a wire?

 

[texie]

That is only shown for illustrative purposes. A separate jumper is not required for a ground bar as it is attached directly/electrically to the enclosure.
A bonding jumper for a neutral is a whole other subject.

 

[LarryFine]

I say, if it is part of the main bonding jumper pathway, use 250.66; if it is not, then use 250.122.

So, just to bond the enclosure, it's merely an equipment-grounding conductor.

 

[iustacould]

I have a question along the same lines of you all have time.

2017 NEC articles 250.32 and 250.68 seem to read that if I have a feeder or MWBC supplying AC power to an outlbuilding or structure Sub Panel, it too must have a GE System of its own. I was always taught that if you run the feeder with an EGC included you were covered (EGC and Grounded Conductor not bonded at the sub of course). Have I been wrong this whole time or am I missing something??

 

[infinity]

A sub-panel in a separate structure require both an EGC with the feeder and a GES.

 

[iustacould]