(a) No person 14 or 15 years of age shall be employed, permitted, or suffered to work in any gainful occupation for more than six days in any one week, or for more than 40 hours in any one week, or for more than eight hours in any one day, or before 7:00 a.m. or after 9:00 p.m. during school summer vacation. During the time school is in regular session, no person 14 or 15 years of age shall be employed, permitted, or suffered to work in any gainful occupation for more than six days in any one week, or for more than eight hours on a non-school day, or more than three hours on a school day, or for more than 18 hours in any school week, and not before 7:00 a.m. or after 7:00 p.m.
(b) No person 16, 17, or 18 years of age, who is enrolled in any public or private primary or secondary school system, shall work between 10:00 p.m. and 5:00 a.m. on any night preceding a school day. The appropriate county or city superintendent of schools, or where there is no superintendent, the school headmaster, may grant exemptions to the above time restrictions. Exemptions shall be granted only when the individual circumstances are found to be in the best interests of the minor. Information of any exemptions granted shall be transmitted to a child labor inspector on a form authorized by him or her.