What is the maximum number of 12 AWG THHN copper conductors permitted through a standard 3/4" LB conduit body?

To determine the maximum number of 12 AWG THHN copper conductors allowed in a standard 3/4" LB conduit body, we must refer to the National Electrical Code (NEC) guidelines for conduit fill.

A 3/4" conduit has a specific fill capacity measured in cubic inches which is determined based on the size of the conductors being used, their insulation type, and the overall capacity of the conduit. In this case, each 12 AWG THHN copper conductor has a volume of approximately 0.0133 cubic inches.

The NEC specifies that when using a conduit, the conductor fill must not exceed 40% of the cross-sectional area of the conduit for conductors that are not in raceways. For a 3/4" conduit, this fills up to a total of approximately 20.7 cubic inches. When calculating the maximum number of conductors, taking into account the volume per conductor, we see that about 16 conductors of 12 AWG can fit within the permissible volume of the conduit.

Therefore, the correct answer of 16 reflects this calculation while adhering to the NEC guidelines, ensuring safety and efficiency in electrical installations. Other numbers do not accurately represent the capacity, showing