"Sure there are, the ASHRAE 90.1 energy code includes maximum permissible voltage drop requirements. ASHRAE 90.1 has been adopted by most US jurisdictions."
Thank you for the reply...however -
1. ASHRAE is not a code...it is a standard
2. US jurisdictions typically do not adopt standards...to...
"To comply with the code required 3% or 5% maximum voltage drop."
Just a minutia comment - there are no code requirements to limit voltage drop. The code has Fine Print Notes [which are not enforceable] which 'suggest' sizing conductors to limit voltage drop in branch circuits and feeder...
