New Jersey spelled out what equipment minors (with their parents' signature) can be near since they do allow for those under 18 to take the class but can not certify until 18.
4. Minors shall not be permitted to do the following in classes or after certification until they reach the age of 18
http://www.state.nj.us/health/ems/documents/njac840ar.pdf
i. Operate power-driven machinery including, but not limited to, fire
apparatus, MAVs, BLS ambulances, MICUs, SCTUs and/or AMUs;
ii. Oil, wipe or clean any machinery in motion, inclusive of rescue tools;
iii. Utilize any machine that grinds, buffs, or polishes;
iv. Operate any hoisting equipment, inclusive of chain and cable come-a-
longs;
v. Utilize any torch device utilized to heat, melt or cut metals, including
rescue torches; or
vi. Operate and/or maintain any high-pressure hydraulic tool or air bag.
(c) No student shall be:
1. Exposed to injurious quantities of any toxic or noxious dust, gases, vapors
and/or fumes; or
2. Exposed to, or allowed to participate in, direct firefighting operations.