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Wiring - Maximum Number of Conductors in Conduit

Conduit Size   1/2 3/4 1 1-1/4 1-1/2 2 2-1/2 3 3-1/2 4 5 6
Wire Type

Conductor
Size

 

TW, T, RUH
RUW, XHHW
(14-18)

14 9 15 25 44 60 99 142          
12 7 12 19 35 47 78 111 142        
10 5 9 15 26 36 60 85 131 176      
8 2 4 7 12 17 28 40 62 84 108    

RHW (no outer 
covering),
RHH (no outer 
covering),
THW

14 6 10 16 29 40 65 93 143 192      
12 4 8 13 24 32 53 76 117 157      
10 4 6 11 19 26 43 61 95 127 163    
8 1 3 5 10 13 22 32 49 66 85 133  

TW, T, THW,
RUH (6 thru 2),
RUW (6 thru 2),
FEPB (6 thru 2),
RHW (no outer
covering)
RHH (no outer
covering)

6 1 2 4 7 10 16 23 36 48 62 97 141
4 1 1 3 5 7 12 17 27 36 47 73 106
3 1 1 2 4 6 10 15 23 31 40 63 91
2 1 1 2 4 5 9 13 20 27 34 54 78
1   1 1 3 4 6 9 14 19 25 39 57
0 1 1 2 3 5 8 12 16 21 24 35  
00   1 1 1 3 5 7 10 14 18 29 41
000   1 1 1 2 4 6 9 12 15 24 35
0000     1 1 1 3 5 7 10 13 20 29
250     1 1 2 4 6 8 10 16 18  
300     1 1 1 3 3 5 7 9 14 20
350       1 1 1 3 4 6 8 12 18
400       1 1 1 2 4 5 7 11 16
500       1 1 1 1 3 4 6 9 14
600         1 1 1 3 4 5 7 11
700         1 1 1 2 3 4 7 10
750         1 1 1 2 3 4 6 9

THWN,
THHN,
FEP
(14 thru 2),
FEPB
(14 thru 8),
PFA
(14 thru 4/0),
PFAH
(14 thru 4/0),
Z
(14 thru 4/0),
XHHW
(4 thru 500MCM)

14 13 24 39 69 94 154            
12 10 18 29 51 70 114 164          
10 6 11 18 32 44 73 104 160        
8 3 5 9 16 22 36 51 79 106 136    
6 1 4 6 11 15 26 37 57 76 96 154  
4 1 2 4 7 9 16 22 35 47 60 94 137
3 1 1 3 6 8 13 19 29 39 51 80 116
2 1 1 3 5 7 11 16 25 33 43 72 97
1 1 1 3 5 6 10 14 25 32 41 52  
0   1 1 3 4 7 10 15 21 27 42 61
00   1 1 2 3 6 8 13 17 22 35 51
000   1 1 1 3 5 7 11 14 18 29 42
0000   1 1 1 2 4 6 9 12 15 24 35
250     1 1 1 3 4 7 10 12 20 28
300     1 1 1 3 4 6 8 11 17 24
350     1 1 1 2 3 5 7 9 15 21
400       1 1 1 3 5 6 8 13 19
500       1 1 1 2 4 5 7 11 16
600       1 1 1 1 3 4 5 9 13
700         1 1 1 3 4 5 8 12
750         1 1 1 2 3 4 7 11
XHHW 6 1 3 5 9 13 21 30 47 63 81 128 185
600       1 1 1 1 3 4 5 9 13
700         1 1 1 3 4 5 7 11
750         1 1 1 2 3 4 7 10

See NEC's NFPA 70 Informative Annex C Conduit and Tubing FillTables for Conductors and Fixture Wires ofthe Same Size for more information.

Next Steps

Go to the Control and Power Wiring Lesson series to select your next lesson.  There are also many other Lesson Series on PLC Programming and Industrial Automation.

Information