Final answer:
No, the metal frame of an attic exhaust fan should not be connected to the grounded conductor; it should be connected to the grounding system to ensure safety.
Step-by-step explanation:
The proper connection of electrical components is critical for safety, and this includes an attic exhaust fan. The grounded conductor, often known as the neutral wire, has a specific purpose of carrying current back to the source in a normal operating condition. The metal frame of an exhaust fan, however, should be connected to an equipment grounding conductor or the grounding system of the electrical installation. This is to ensure that in the event of a fault, such as a short circuit, the electrical current is safely directed into the earth, limiting the risk of shock or fire. Connecting the metal frame to the grounded conductor is not safe, as the metal frame could potentially become energized, presenting a shock hazard. Therefore, the answer to the question 'Is it permitted to connect the metal frame of the attic exhaust fan to the grounded conductor?' is no.