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Box Fill Calculator
NEC 314.16 conductor count and cubic inch box fill calculation
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Box Selection
Box volume: 18 cu in
Conductors
Count each conductor that enters and terminates in the box.
6.75 inΒ³
Other Fill Items
1= 4.50 cu in
Fill Results
Total Fill Used
13.50 inΒ³
Box capacity: 18 cu in
Conductors6.75 cu in
Devices (1Γ yoke)4.50 cu in
EGCs (all)2.25 cu in
Total13.50 / 18 cu in
β Pass β 4.50 cu in remaining
NEC 314.16(B) Fill Allowances
Each conductor entering & terminating1Γ its volume
Each conductor passing through1Γ its volume
All EGCs combined1Γ largest conductor
Each device yoke / strap2Γ largest conductor
All internal clamps combined1Γ largest conductor
Isolated grounding conductors1Γ each its own volume
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