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Table 11. Box Size per NEC 314.28
Minimum Box Length for Straight Through Splice
3/C
Conduit
Box
4/C
Conduit
Box
AWG/Kcmil
Size
Size
AWG/Kcmil
Size
Size
8
1
8
8
1
8
6
1
8
6
1.25
10
4
1.25
10
4
1.25
10
3
1.25
10
3
1.5
12
2
1.25
10
2
1.5
12
1
2
16
1
2
16
1/0
2
16
1/0
2
16
2/0
2
16
2/0
2.5
20
3/0
2
16
3/0
2.5
20
4/0
2.5
20
4/0
2.5
20
250
2.5
20
250
3
24
350
3
24
350
3.5
28
500
3
24
500
3.5
28
Minimum Box Size for Angle Splice
3/C
Conduit
Box
4/C
Conduit
Box
AWG/Kcmil
Size
Size
AWG/Kcmil
Size
Size
8
1
6
8
1
6
6
1
6
6
1.25
7.5
4
1.25
7.5
4
1.25
7.5
3
1.25
7.5
3
1.5
9
2
1.25
7.5
2
1.5
9
1
2
12
1
2
12
1/0
2
12
1/0
2
12
2/0
2
12
2/0
2.5
15
3/0
2
12
3/0
2.5
15
4/0
2.5
15
4/0
2.5
15
250
2.5
15
250
3
18
350
3
18
350
3.5
21
500
3
18
500
3.5
21
All conduit and box sizes in inches.
Based on flexible metal conduit without a ground wire, and RHW-2 conductor size per the NEC.
