Final answer:
Class C hard hats are not ANSI approved for electrical protection because they are made of conductive materials, but are still ANSI approved for impact protection. Hence, in the context of the question, Class C is the correct answer as it specifies ANSI approval in regards to electrical hazards.
Step-by-step explanation:
The question asks about the American National Standards Institute (ANSI) approved types of hard hats. ANSI has established safety standards to provide guidance on the manufacturing, selection, and use of personal protective equipment. According to the ANSI Z89.1 standard, there are different types of hard hats categorized into types and classes to protect workers from impact and electrical hazards respectively.
Type I hard hats are designed to protect against impacts from falling objects to the top of the head, whereas Type II hard hats provide additional lateral protection. As for the classes, Class G (General) hard hats are rated for 2,200 volts, Class E (Electrical) are rated for 20,000 volts, and Class C (Conductive) provide no electrical protection and are not intended for use around electrical hazards because they are made of conductive materials.
Therefore, among the options provided, Class C hard hats are NOT ANSI approved for electrical protection, making it the correct answer to the question. However, it is important to note that while Class C hard hats are not approved for electrical protection, they are still ANSI approved for impact protection, but specifically not for situations with electrical hazards.