You do know what they say about those that brag 
I report on Vd exceeding >8.4% in branch/lighting circuits.
Voltage Drop in a Circuit.
Don’t Let Voltage Drop Get Your System Down.
Where did the 8.4% come from?
Morning, Ryan. Hope this post finds you well and in good spirits today.
The 8.4 Vd measurement comes from an engineering article I ran across, read and misplaced due to a server computer crash and lost files. My one drive was disconnected. Once I retrieve the article I will post it for members.
I analyze, load test, all receptacles, up and downstream, on a lighting branch circuits, as well as using a wiggly on mechanical/appliance circuits.
Not verbatim mind you but the article explained the possibility for anomalies on lighting circuits. Wire fire and anomalies from modern appliance technology software, ie; Dryers, Modens, TV’s, etc is exponentially increased.
Hope that helps.
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Right on @ryoung7. Yea I was just curious what people were using for percentage. It’s pretty easy to find the nec recommendation, but it’s just that, a recommendation.