Final answer:
To support a non-metallic box, non-metallic conduits act as electrical insulators, while metal options like threaded metal conduits or EMT require proper fittings for secure installation.
Step-by-step explanation:
To support a non-metallic box with conduits, we must understand the properties and classifications of materials used in electrical applications. Metals, with their significant ability to conduct electricity and heat, are a common choice for conduits which are protective tubes or pipes that shield electrical wires. However, for a non-metallic box, one may choose to use non-metallic conduits, which do not conduct electricity, to prevent electrical hazards. It's important to consider that materials like plastics are electrical insulators, meaning they do not allow the passage of an electrical current, contrasting with metals that serve as good conductors. Moreover, if the requirement is for threaded metal conduits or Electrical Metallic Tubing (EMT), which is a type of metal conduit, they must have threads for secure connection, and with EMT particularly, its own set of fittings due to its non-threaded nature.