Conduit Fill

Maximum Number Of THHN/THWN Conductors In Conduit Or Tubing Per 1993 NECŪ

Type: TFFN--Fixture Wires

Size
AWG		 1/2
Inch		 3/4
Inch		 1
Inch		 1-1/4
Inch		 1-1/2
Inch		 2
Inch		 2-1/2
Inch		 3
Inch		 3-1/2
Inch		 4
Inch		 5
Inch		 6
Inch
18
16		 19
15		 34
26		 55
43		 97
76		 132
104		 216
169		 --
--		 --
--		 --
--		 --
--		 --
--		 --
--

Type: THHN-THWN

Size AWG MCM 1/2 Inch 3/4 Inch 1 Inch 1-1/4 Inch 1-1/2 Inch 2 Inch 2-1/2 Inch 3 Inch 3-1/2 Inch 4 Inch 5 Inch 6 Inch
14
12
10		 13
10
6		 24
18
11		 39
29
18		 69
51
32		 94
70
44		 154
114
73		 --
164
104		 --
--
160		 --
--
--		 --
--
--		 --
--
--		 --
--
--
8
6
4		 3
1
1		 5
4
2		 9
6
4		 16
11
7		 22
15
9		 36
26
16		 51
37
22		 79
57
35		 106
76
47		 136
98
60		 --
154
94		 --
--
137
3
2
1		 1
1
--		 1
1
1		 3
3
1		 6
5
3		 8
7
5		 13
11
8		 19
16
12		 29
25
18		 39
33
25		 51
43
32		 80
67
50		 116
97
72
1/0
2/0
3/0		 --
--
--		 1
1
1		 1
1
1		 3
2
1		 4
3
3		 7
6
5		 10
8
7		 15
13
11		 21
17
14		 27
22
18		 42
35
29		 61
51
42
4/0
250
300		 --
--
--		 1
--
--		 1
1
1		 1
1
1		 2
1
1		 4
3
3		 6
4
4		 9
7
6		 12
10
8		 15
12
11		 24
20
17		 35
28
24
350
400
500		 --
--
--		 --
--
--		 1
--
--		 1
1
1		 1
1
1		 2
1
1		 3
3
2		 5
5
4		 7
6
5		 9
8
7		 15
13
11		 21
19
16
600
750		 --
--		 --
--		 --
--		 1
--		 1
1		 1
1		 1
1		 3
2		 4
3		 5
4		 9
7		 13
11

Combination Of Conductors

For groups of combinations of conductors the conduit or tubing shall be of such size that the sum of the cross sectional areas of the individual conductors will not be more than the percentage of the interior cross sectional area of the conduit or tubing shown in the following table:

Number Of
Conductors

1

2

3

4

Over
4

All Conductor
types except
lead-covered
(new or rewiring)

53

31

40

40

40

Lead-covered
Conductors

55

30

40

38

3

The information presented within this section has been carefully prepared and is believed to be accurate. Alan Wire Company makes no warranties expressed or implied, and disclaim any responsibility or liability for loss or damage as a result of use of this information.