pvc Box
PVC Round Ceiling Box 20 cu.in.
PVC ceiling box for light fixtures and ceiling fans.
Quick answer
A PVC Round Ceiling Box 20 cu.in. (20 cu.in.) holds 8 × 12 AWG or 10 × 14 AWG conductors in a bare box under NEC 314.16.
Subtract two allowances for each device or strap, and one for each set of internal clamps, grounding conductors, or support fittings. Run your exact box fill →
20
cu.in. Volume
10
Max 14 AWG
8
Max 12 AWG
4" Round x 2-1/4"
Dimensions
Conductor Capacity per NEC 314.16
Maximum number of conductors that can fit in this box based on wire gauge (not accounting for devices, clamps, or grounds).
| Wire Gauge | Volume Each | Max Conductors* |
|---|---|---|
| 18 AWG | 1.5 cu.in. | 13 |
| 16 AWG | 1.75 cu.in. | 11 |
| 14 AWG | 2 cu.in. | 10 |
| 12 AWG | 2.25 cu.in. | 8 |
| 10 AWG | 2.5 cu.in. | 8 |
| 8 AWG | 3 cu.in. | 6 |
| 6 AWG | 5 cu.in. | 4 |
*Theoretical maximum for conductors only. Actual capacity will be less when including devices, clamps, and grounding conductors.
Common Applications
Ceiling lights
Ceiling fan mounts
Pendant lights
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Use our free calculator to verify NEC 314.16 requirements.
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