Core TradesQuestion 137 of 700
When calculating outlet box fill, how are the equipment grounding conductors entering a box counted?
a.Each grounding conductor counts as one conductor
b.Each grounding conductor counts as two conductors
c.All grounding conductors together count as a single conductor volume
d.Grounding conductors are never counted
Explanation
All equipment grounding conductors in a box collectively count as a single conductor volume allowance (based on the largest one present), because they occupy relatively little usable space. Counting each one separately would overstate the fill, and ignoring them entirely would understate it.
Law Reference: 2025 CA Electrical Code, Art. 314.16Practice all 700 questions free — no signup required.
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