How do you identify ungrounded conductors?
Under the 2011 NEC, the requirements took up about 1/6th of a page. The 2014 NEC includes those verbatim (with changes to the numbering of the subsections), but also includes nearly half a page of additional requirements. The new requirements pertain to branch circuits supplied by DC systems operating at over 50V.
Let’s begin with the older set of requirements. These apply when the premises wiring system has branc