⚡ Question Of The Week ⚡ (2026 NEC)
#QuestionOfTheWeek2026:
How many #12 AWG THHN conductors are permitted in a 4" × 4" metal box that is 1½ inches deep, with no devices, no internal clamps, and no equipment grounding conductors?
💬 Comment your answer AND explain why below.
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Good luck, code nerds. ⚡
Per T314.16A, (9) #12 conductors are allowed. A 4x4x1.5" box has 21cu.in. Per T314.16B, 21"/2.25" = 9.333... or 9 maximum conductors.
Kenneth Hengst 💯 great breakdown, Kenneth, thanks!
T314.16)A) indicates 9-#12 conductors are acceptable in a 4X4X1-1/2" square box
David Engelhart spot on, thanks David.