Conduit Fill Quick Chart

Maximum number of same-size THHN/THWN-2 conductors in EMT and in PVC Schedule 40, using Chapter 9 Table 1 (40% for 3 or more), Table 4 trade-size areas, and Table 5 conductor areas — the same math as the conduit fill calculator. These Annex C-style counts are unchanged between the 2020 and 2023 NEC. Mixed sizes, different insulation, nipples (60% for ≤24 in.), and derating for more than 3 current-carrying conductors are not shown here.

Open the full fill calculator for mixed sizes, XHHW, and other raceways. Wire-pulling cheat sheet →