NEC 2026 Compatible

Internal cable clamps in a box count as how many conductors for box fill?

Apprentice Level📋 NEC 314.16(B)(2)Box Fill
Circuit Diagram
Box Fill Calculation — NEC 314.16 4" × 2⅛" Square Box 4× #12 1× GND DEV Recep Clamp Box Fill Count (#12 AWG) Each #12 = 2.25 cu in 4 conductors (#12) 4 × 2.25 1 device (yoke) 2 × 2.25 1 cable clamp (all=1) 1 × 2.25 1 EGC (all=1) 1 × 2.25 Total Volume Required: 18.0 cu in 4"×2⅛" box capacity: 30.3 cu in PASS — adequate fill NEC 314.16(B) Volume Allowances: Conductor=1ea | Clamp(all)=1 | EGC(all)=1 | Device=2 | Table 314.16(B) for cu in per gauge
A

Zero

B

One conductor (based on the largest conductor in the box)

C

One per clamp

D

Two conductors total

Explanation & Direct Citation

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