Location of main versus sub panel & bonding of grounding & neutral conductors

[rmeier2 (Robert Meier)]

@ahowell1

That’s good to have a more precise terminology to use for those feeders. Thank you for sharing that. I will use that more accurate wording.

With that said I would think that sub panel with a 4-wire feeder should not have a green screw on the neutral bus bar.

You’re welcome.

You are correct, with a 4-wire feeder there would be a separate bus for both the EGC’s and the neutrals and the neutral bus would be isolated from the enclosure (no green screw). A GEC would terminate on the EGC bus not the neutral bus.