Box Fill Calculation Step by Step (NEC 314.16) — Exam Prep
5:24
That overstuffed device box isn't just hard to close — the NEC has an exact rule for it.
In this lesson: the box volume table, the 5 fill categories (conductors, clamps, support fittings, devices — counted DOUBLE, and grounds — counted as ONE), two full worked examples, and the exceptions and traps that show up on the exam.
Based on the 2023 NEC (Article 314.16).
