NFPA 70E says that unqualified persons “shall be trained in, and familiar with, any electrical safety-related practices necessary for their safety” [110.6(A)(2)]. However, it has very detailed training requirements that apply to qualified persons.
Those are summed up in 110.6(A)(1): “A qualified person shall be trained and knowledgeable in the construction and operation of equipment or a specific work method and be trained to identify and avoid the electrical hazards that might be present with respect to that equipment or work method.”
The details follow in 110.6(A)(1)(a) through (f). You need to read the actual standard, but here is the gist of it:
a. The qualified person must be familiar with procedures, personal protective equipment, insulating tools, etc.
b. Being qualified for one task doesn’t mean you’re qualified for all tasks.
c. People permitted to work within the limited approach boundary must be trained in the four areas delineated in 110.6(A)(1)(c)(1) through (4). For example, able to determine the nominal voltage of exposed energized parts.
d. A person undergoing on-the-job training to be a qualified person is considered a qualified person if under the direct supervision of a qualified person.
e. You must be able to demonstrate how to correctly select and use an instrument to determine the absence of voltage.
f. The employer shall determine whether the qualified person is complying with the required safety-related work practices.