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Nec Box Fill: metal box
120x38 square to 95x50x90 masonry
NEC (NFPA 70) box fill requirements — minimum volume for metal outlet/device/junction boxes (Table 314.16(A)) and volume allowance per conductor by wire size (Table 314.16(B))
| record type | box key | description | max conductors awg 10 | max conductors awg 12 | max conductors awg 14 | max conductors awg 16 | max conductors awg 18 | max conductors awg 6 | max conductors awg 8 | min volume cm3 (cm3) | min volume in3 (in3) | nec table | standard |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| metal box | 120x38 square | 120 x 38 (4-11/16 x 1-1/2) square | 11 | 13 | 14 | 16 | 19 | 5 | 9 | 484 | 29.5 | 314.16(A) | NEC (NFPA 70) 2017 Edition Table 314.16 |
| metal box | 120x54 square | 120 x 54 (4-11/16 x 2-1/8) square | 16 | 18 | 21 | 24 | 28 | 8 | 14 | 689 | 42 | 314.16(A) | NEC (NFPA 70) 2017 Edition Table 314.16 |
| metal box | 75x50x38 device | 75 x 50 x 38 (3 x 2 x 1-1/2) device | 3 | 3 | 3 | 4 | 5 | 1 | 2 | 123 | 7.5 | 314.16(A) | NEC (NFPA 70) 2017 Edition Table 314.16 |
| metal box | 75x50x50 device | 75 x 50 x 50 (3 x 2 x 2) device | 4 | 4 | 5 | 5 | 6 | 2 | 3 | 164 | 10 | 314.16(A) | NEC (NFPA 70) 2017 Edition Table 314.16 |
| metal box | 75x50x57 device | 75 x 50 x 57 (3 x 2 x 2-1/4) device | 4 | 4 | 5 | 6 | 7 | 2 | 3 | 172 | 10.5 | 314.16(A) | NEC (NFPA 70) 2017 Edition Table 314.16 |
| metal box | 75x50x65 device | 75 x 50 x 65 (3 x 2 x 2-1/2) device | 5 | 5 | 6 | 7 | 8 | 2 | 4 | 205 | 12.5 | 314.16(A) | NEC (NFPA 70) 2017 Edition Table 314.16 |
| metal box | 75x50x70 device | 75 x 50 x 70 (3 x 2 x 2-3/4) device | 5 | 6 | 7 | 8 | 9 | 2 | 4 | 230 | 14 | 314.16(A) | NEC (NFPA 70) 2017 Edition Table 314.16 |
| metal box | 75x50x90 device | 75 x 50 x 90 (3 x 2 x 3-1/2) device | 7 | 8 | 9 | 10 | 12 | 3 | 6 | 295 | 18 | 314.16(A) | NEC (NFPA 70) 2017 Edition Table 314.16 |
| metal box | 95x50x65 masonry | 95 x 50 x 65 (3-3/4 x 2 x 2-1/2) masonry box | 5 | 6 | 7 | 8 | 9 | 2 | 4 | 230 | 14 | 314.16(A) | NEC (NFPA 70) 2017 Edition Table 314.16 |
| metal box | 95x50x90 masonry | 95 x 50 x 90 (3-3/4 x 2 x 3-1/2) masonry box | 8 | 9 | 10 | 12 | 14 | 4 | 7 | 344 | 21 | 314.16(A) | NEC (NFPA 70) 2017 Edition Table 314.16 |
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