Box fill calculations ensure adequate space inside electrical boxes per NEC 314.16. Each conductor counts as one volume unit; equipment grounding conductors count as one total; devices count as two conductor volumes based on largest conductor. Worked example: conductors + 1 device + grounds in 14 AWG: Volume per conductor ≈ 2.0 in³. Count: 4 + 2 (device) + 1 (grounds) = 7 units → 7 × 2.0 = 14 in³ minimum box volume.
Box fill calculations ensure adequate space inside electrical boxes per NEC 314.16. Each conductor counts as one volume unit; equipment grounding conductors count as one total; devices count as two conductor volumes based on largest conductor.
Worked example: conductors + 1 device + grounds in 14 AWG: Volume per conductor ≈ 2.0 in³. Count: 4 + 2 (device) + 1 (grounds) = 7 units → 7 × 2.0 = 14 in³ minimum box volume.
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