(a)  In determining compensation for partial disability, except permanent partial disability compensable under sections 8107–8109 of this title, the wage-earning capacity of an employee is determined by his actual earnings if his actual earnings fairly and reasonably represent his wage-earning capacity. If the actual earnings of the employee do not fairly and reasonably represent his wage-earning capacity or if the employee has no actual earnings, his wage-earning capacity as appears reasonable under the circumstances is determined with due regard to⁠—

(1)  the nature of his injury;

(2)  the degree of physical impairment;

(3)  his usual employment;

(4)  his age;

(5)  his qualifications for other employment;

(6)  the availability of suitable employment; and

(7)  other factors or circumstances which may affect his wage-earning capacity in his disabled condition.

(b)  Section 8114(d) of this title is applicable in determining the wage-earning capacity of an employee after the beginning of partial disability.