metal Box
4-11/16" Square x 2-1/8" Deep
Extra deep large format square box for high-capacity installations.
Quick answer
A 4-11/16" Square x 2-1/8" Deep (42 cu.in.) holds 18 × 12 AWG or 21 × 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 →
42
cu.in. Volume
21
Max 14 AWG
18
Max 12 AWG
4-11/16" x 4-11/16" x 2-1/8"
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. | 28 |
| 16 AWG | 1.75 cu.in. | 24 |
| 14 AWG | 2 cu.in. | 21 |
| 12 AWG | 2.25 cu.in. | 18 |
| 10 AWG | 2.5 cu.in. | 16 |
| 8 AWG | 3 cu.in. | 14 |
| 6 AWG | 5 cu.in. | 8 |
*Theoretical maximum for conductors only. Actual capacity will be less when including devices, clamps, and grounding conductors.
Common Applications
High-capacity commercial
Multiple circuit junction
Calculate Box Fill
Use our free calculator to verify NEC 314.16 requirements.
Calculate Box Fill