N.C. Gen. Stat. § 97-30
Except as otherwise provided in G.S. 97-31, where the incapacity for work resulting from the injury is partial, the employer shall pay, or cause to be paid, as hereinafter provided, to the injured employee during such disability, a weekly compensation equal to sixty-six and two-thirds percent (66 2/3%) of the difference between his average weekly wages before the injury and the average weekly wages which he is able to earn thereafter, but not more than the amount established annually to be effective January 1 as provided in G.S. 97-29 a week, and in no case shall the employee receive more than 500 weeks of payments under this section. Any weeks of payments made pursuant to G.S. 97-29 shall be deducted from the 500 weeks of payments available under this section. An officer or member of the State Highway Patrol shall not be awarded any weekly compensation under the provisions of this section for the first two years of any incapacity resulting from an injury by accident arising out of and in the course of the performance by him of his official duties if, during such incapacity, he continues to be an officer or member of the State Highway Patrol, but he shall be awarded any other benefits to which he may be entitled under the provisions of this Article.
N.C. Gen. Stat. § 97-30