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Conduit Fill Table PVC


This conduit fill table is used to determine how many wires that can be safely put into conduit tubing.The rows going across is the size of the conduit and the type. The columns going down shows the gauge of wire that is being used. The results are the numbers of wires of that gauge, that can be run through that size, of that kind of conduit such as Schedule 40 PVC or Schedule 80 PVC. This chart is based on the 2017 NEC code.

Trade Size in Inches

Wire Size (THWN, THHN) Conductor Size AWG/kcmil

14 12 10 8 6 4 3 2 1 1/0 2/0 3/0 4/0 250 300 350 400 500 600 700 750 800 900 1000
1/2 1/2 in SCH 40 11 8 5 3 1 1 1 1 1 1
1/2 in SCH 80 9 6 4 2 1 1 1 1

3/4
3/4 in SCH 40 21 15 9 5 4 2 1 1 1 1 1 1 1
3/4 in SCH 80 17 12 7 4 3 1 1 1 1 1 1 1
1 1 in SCH 40 34 25 15 9 6 4 3 3 1 1 1 1 1 1 1 1
1 in SCH 80 28 20 13 7 5 3 3 2 1 1 1 1 1 1
1 1/4 1 1/4 in SCH 40 60 43 27 16 11 7 6 5 3 3 2 1 1 1 1 1 1 1 1
1 1/4 in SCH 80 51 37 23 13 9 6 5 4 3 2 1 1 1 1 1 1 1 1
1 1/2 1 1/2 in SCH 40 82 59 37 21 15 9 8 7 5 4 3 3 2 1 1 1 1 1 1 1 1 1 1
1 1/2 in SCH 80 70 51 32 18 13 8 7 6 4 3 3 2 1 1 1 1 1 1 1 1 1

2
2 in SCH 40 135 99 62 36 26 16 13 11 8 7 6 5 4 3 3 2 1 1 1 1 1 1 1 1
2 in SCH 80 118 86 54 31 22 14 12 10 7 6 5 4 3 3 2 1 1 1 1 1 1 1 1 1
2 1/2 2 1/2 in SCH 40 193 141 89 51 37 22 19 12 10 8 7 6 4 4 3 3 2 1 1 1 1 1 1 1
2 1/2 in SCH 80 170 124 78 45 32 20 17 14 10 9 7 6 5 4 3 3 3 2 1 1 1 1 1 1
3 3 in SCH 40 299 218 137 79 57 35 30 25 18 15 13 11 9 7 6 5 5 4 3 3 2 2 2 1
3 in SCH 80 265 193 122 70 51 31 26 22 16 14 11 9 8 6 5 5 4 3 3 2 2 2 1 1
3 1/2 3 1/2 in SCH 40 401 393 184 106 77 47 40 33 25 21 17 14 12 10 8 7 6 5 4 4 3 3 3 3
3 1/2 in SCH 80 358 261 164 95 68 42 35 30 22 18 15 13 10 8 7 6 6 5 4 3 3 3 3 2

4
4 in SCH 40 517 377 238 137 99 61 51 43 32 27 22 18 15 12 11 9 8 7 5 5 4 4 4 3
4 in SCH 80 464 338 213 123 89 54 46 39 29 24 20 17 14 11 9 8 7 6 5 4 4 4 3 3

5
5 in SCH 40 815 594 374 216 156 96 81 68 50 42 35 29 24 20 17 15 13 11 9 8 7 7 6 6
5 in SCH 80 736 537 338 195 141 86 73 61 45 38 32 26 22 18 15 13 12 10 8 7 7 6 6 5

6
6 in SCH 40 >1K* 859 541 312 225 138 117 98 73 61 51 42 35 28 24 21 19 16 13 11 11 10 9 8
6 in SCH 80 >1K* 770 485 279 202 124 105 88 65 55 46 38 31 25 22 19 17 14 12 10 9 9 8 7
 

*Please refer the National Electric Code of 2017 for the exact calculation.
Above information referenced from tables C10, and C11 in the National Electric Code of 2017.
For more information on the following types of conduit, please see the table listed below in the appendix C of the National Electric Code of 2017.

Rigid PVC Conduit, Schedule 80 -- Table C10
Rigid PVC Conduit, Schedule 40 -- Table C11
Flexible Metallic Conduit -- Table C3
Liquidtight Flexible Metallic Conduit -- Table C7
Liquidtight Flexible Nonmetallic Conduit (Type FNMC-B)-- Table C5

If you have any other questions see the NEC Code Book or ask an Elliott Electric Salesperson.