Gentlemen:
VD is addressed within 210.19 (FPN)3% branch circuits, and 2% feeders, hence 5% total.
I was and am under the impression that (FPN's) are 'non-enforceable', and only advisory. On that note, did your location write a local amendment with the "5%"??
As an EC (commercial/ind) VD is an issue that I address 'as required' for my clients, not as an NEC requirement. Further, within plans and specs, the EE/Architect addresses his/her VD requirements, and they MUST be adhered to, unless they create an NEC conflict.
As an AHJ, I have to enforce the plans and specs, as they become part of the Electrical Permit, upon review and approvals.
The areas that I am familiar with are comm/ind; a 'large' building can be 700K SF, and yes, VD is addressed. (By the EE/Arch, EC, and AHJ)
As to resi....; sub-panel(s) are common, a lot of #12, and it has never become an issue that I am aware of.
BTW; we do a volt check at the service entrance, and base calcs on the 'available voltage', not the 'rated voltage'.
I also include 'basic' VD calcs in my class at the Vo-Tech.
John
