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PVC Conduit Fill Chart

The PVC conduit fill chart offers a quick and convenient suggestion to determine the number of wires in a conduit. There are several types of PVC conduits on the chart i.e. SCH 40 and SCH 80. The PVC conduit fill chart fully complies with NEC 2020 chapter 9.

For a mix of wire type and size, an online tool to decide conduit fill (in percent) has been introduced at conduit fill calculation. Also, a conduit fill chart for EMT and RMC could be found here.

Trade Size (Inches)

Wire Type (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
1/2 SCH 40 11 8 5 3 1 1 1 1 1 1
SCH 80 9 6 4 2 1 1 1 1

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

2
SCH 40 135 99 62 36 26 16 13 11 8 7 6 5 4 3 3 2 1 1 1 1 1
SCH 80 118 86 54 31 22 14 12 10 7 6 5 4 3 3 2 1 1 1 1 1 1
2 1/2 SCH 40 193 141 89 51 37 22 19 16 12 10 8 7 6 4 4 3 3 2 1 1 1
SCH 80 170 124 78 45 32 20 17 14 10 9 7 6 5 4 3 3 3 2 1 1 1
3 SCH 40 299 218 137 79 57 35 30 25 18 15 13 11 9 7 6 5 5 4 3 3 2
SCH 80 265 193 122 70 51 31 26 22 16 14 11 9 8 6 5 5 4 3 3 2 2
3 1/2 SCH 40 401 293 184 106 77 47 40 33 25 21 17 14 12 10 8 7 6 5 4 4 3
SCH 80 358 261 164 95 68 42 35 30 22 18 15 13 10 8 7 6 6 5 4 3 3

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

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

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

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