N.C. Gen. Stat. § 14-7.6
When an habitual felon as defined in this Article commits any felony under the laws of the State of North Carolina, the felon must, upon conviction or plea of guilty under indictment as provided in this Article (except where the felon has been sentenced as a Class A, B1, or B2 felon) be sentenced at a felony class level that is four classes higher than the principal felony for which the person was convicted; but under no circumstances shall an habitual felon be sentenced at a level higher than a Class C felony. In determining the prior record level, convictions used to establish a person's status as an habitual felon shall not be used. Sentences imposed under this Article shall run consecutively with and shall commence at the expiration of any sentence being served by the person sentenced under this section.
N.C. Gen. Stat. § 14-7.6