Question

The NEC reference that permits or prohibits connecting the metal frame of the attic exhaust fan to the grounded conductor is ___.

Select one:
a. 250.104(D)
b. 250.142(B)
c. 250.52(A)(2)
d. 250.4(A)(4)

Answer 1

The correct NEC reference that discusses the connection of the metal frame of the attic exhaust fan to the grounded conductor is NEC 250.142(B), which generally prohibits this practice and requires the frame to be connected to the equipment grounding conductor.

Step-by-step explanation:

The NEC reference that permits or prohibits connecting the metal frame of the attic exhaust fan to the grounded conductor is section 250.142(B). According to the National Electrical Code (NEC), the frame of a fixed electrically powered equipment is required to be connected to the equipment grounding conductor.

Section 250.142(B) specifies that the connection shall not be made to the grounded conductor on the load side of the service disconnecting means unless it is permitted elsewhere in the code. Therefore, typically, the frame of an attic exhaust fan should not be connected to the grounded conductor (neutral), but to the equipment grounding conductor to ensure proper grounding and bonding.