Wis. Stat. § 103.65: General standards for employment of minors.

(1) A minor shall not be employed or permitted to work at any employment or in any place of employment dangerous or prejudicial to the life, health, safety, or welfare of the minor or where the employment of the minor may be dangerous or prejudicial to the life, health, safety or welfare of other employees or frequenters.

(2) No minor under 16 years of age may be employed or permitted to work at any employment for such hours of the day or week, for such days of the week, or at such periods of the day as may be dangerous or prejudicial to the life, health, safety, or welfare of the minor.