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Select the raceway, trade size, conductor insulation, wire size, and count for an instant NEC Chapter 9 fill check.
NEC Chapter 9 Table 1 permits 53% fill for one conductor, 31% for two conductors, and 40% for three or more conductors.
Three #12 THHN conductors occupy 7.49% of 3/4-inch EMT, below the 40% limit.
Yes. Chapter 9 Table 5 conductor areas vary by insulation type, so THHN, XHHW, and RHH of the same wire size may produce different fill.
Yes. Every insulated or bare conductor in the raceway occupies area and must be included in the conduit-fill calculation.
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