What is the minimum size EMT required for the installation of four 12 AWG and four 10 AWG THHN copper conductors?

To determine the minimum size EMT (Electrical Metallic Tubing) required for the installation of the given conductors, we need to consider the conduit fill requirements as specified by the National Electrical Code (NEC).

In this scenario, we have four 12 AWG and four 10 AWG THHN copper conductors. First, we need to identify the allowable fill for each type of conductor. According to NEC Table 1, the approximate area of a 12 AWG THHN copper conductor is 0.0133 square inches, and for a 10 AWG THHN copper conductor, it is 0.0201 square inches.

When calculating the total conductor area, we do the following:

1. For four 12 AWG conductors: 4 conductors x 0.0133 square inches = 0.0532 square inches.

2. For four 10 AWG conductors: 4 conductors x 0.0201 square inches = 0.0804 square inches.

Adding these two results together gives us a total conductor area of:

0.0532 + 0.0804 = 0.1336 square inches.

Next, we refer to the NEC’s maximum