conduit fill chart for rigid pvc conduit

Back to References Menu

PVC Conduit Fill Table (THWN, THHN Wire)

This PVC conduit fill table is used to determine how many THWN or THHN wires can be safely put into PVC conduit tubing. Each row going across is a different size of PVC conduit (Schedule 40 or 80). Each column (going up and down) is a different gauge of wire. The results show the allowable number of wires for each size/type of conduit and wire, based on the 2020 NEC code.

See Also:

Conduit
Trade Size
in Inches

Wire Conductor Size (THWN, THHN)
AWG MCM (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
1⁄2 1/2 inch Schedule 40 11 8 5 3 1 1 1 1 1 1
1/2 inch Schedule 80 9 6 4 2 1 1 1 1
3⁄4 3/4 inch Schedule 40 21 15 9 5 4 2 1 1 1 1 1 1 1
3/4 inch Schedule 80 17 12 7 4 3 1 1 1 1 1 1 1
1 1 inch Schedule 40 34 25 15 9 6 4 3 3 1 1 1 1 1 1 1 1
1 inch Schedule 80 28 20 13 7 5 3 3 2 1 1 1 1 1 1
1 1⁄4 1 1/4 inch Schedule 40 60 43 27 16 11 7 6 5 3 3 2 1 1 1 1 1 1 1 1
1 1/4 inch Schedule 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 inch Schedule 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 inch Schedule 80 70 51 32 18 13 8 7 6 4 3 3 2 1 1 1 1 1 1 1 1 1 1
2 2 inch Schedule 40 135 99 62 36 26 16 13 11 8 7 6 5 4 3 3 2 1 1 1 1 1 1 1
2 inch Schedule 80 118 86 54 31 22 14 12 10 7 6 5 4 3 3 2 1 1 1 1 1 1 1 1
2 1⁄2 2 1/2 inch Schedule 40 193 141 89 51 37 22 19 16 12 10 8 7 6 4 4 3 3 2 1 1 1 1 1
2 1/2 inch Schedule 80 170 124 78 45 32 20 17 14 10 9 7 6 5 4 3 3 3 2 1 1 1 1 1
3 3 inch Schedule 40 299 218 137 79 57 35 30 25 18 15 13 11 9 7 6 5 5 4 3 3 2 2 2
3 inch Schedule 80 265 193 122 70 51 31 26 22 16 14 11 9 8 6 5 5 4 3 3 2 2 2 1
3 1⁄2 3 1/2 inch Schedule 40 401 293 184 106 77 47 40 33 25 21 17 14 12 10 8 7 6 5 4 4 3 3 3
3 1/2 inch Schedule 80 358 261 164 95 68 42 35 30 22 18 15 13 10 8 7 6 6 5 4 3 3 3 3
4 4 inch Schedule 40 517 377 238 137 99 61 51 43 32 27 22 18 15 12 11 9 8 7 5 5 4 4 4
4 inch Schedule 80 464 338 213 123 89 54 46 39 29 24 20 17 14 11 9 8 7 6 5 4 4 4 3
5 5 inch Schedule 40 815 594 374 216 156 96 81 68 50 42 35 29 24 20 17 15 13 11 9 8 7 7 6
5 inch Schedule 80 736 537 338 195 141 86 73 61 45 38 32 26 22 18 15 13 12 10 8 7 7 6 6
6 6 inch Schedule 40 >1K* 859 541 312 225 138 117 98 73 61 51 42 35 28 24 21 19 16 13 11 11 10 9
6 inch Schedule 80 >1K* 770 485 279 202 124 105 88 65 55 46 38 31 25 22 19 17 14 12 10 9 9 8

Wire Size

To jump to the section of the PVC Conduit Fill Chart for your gauge of wire, select a wire size.

AWG Wire Size

#14 wire ↓

#12 wire ↓

#10 wire ↓

#8 wire ↓

#6 wire ↓

#4 wire ↓

#3 wire ↓

#2 wire ↓

#1 wire ↓

1/0 wire ↓

2/0 wire ↓

3/0 wire ↓

4/0 wire ↓

MCM Wire Size

250 mcm ↓

300 mcm ↓

350 mcm ↓

400 mcm ↓

500 mcm ↓

600 mcm ↓

700 mcm ↓

750 mcm ↓

800 mcm ↓

900 mcm ↓

1000 mcm ↓

Conduit
Trade Size
in Inches

AWG Wire Conductor Size
14 12 10
1⁄2 1/2 inch Schedule 40 11 8 5
1/2 inch Schedule 80 9 6 4
3/4 3/4 inch Schedule 40 21 15 9
3/4 inch Schedule 80 17 12 7
1 1 inch Schedule 40 34 25 15
1 inch Schedule 80 28 20 13
1 1⁄4 1 1/4 inch Schedule 40 60 43 27
1 1/4 inch Schedule 80 51 37 23
1 1⁄2 1 1/2 inch Schedule 40 82 59 37
1 1/2 inch Schedule 80 70 51 32
2 2 inch Schedule 40 135 99 62
2 inch Schedule 80 118 86 54
2 1⁄2 2 1/2 inch Schedule 40 193 141 89
2 1/2 inch Schedule 80 170 124 78
3 3 inch Schedule 40 299 218 137
3 inch Schedule 80 265 193 122
3 1⁄2 3 1/2 inch Schedule 40 401 293 184
3 1/2 inch Schedule 80 358 261 164
4 4 inch Schedule 40 517 377 238
4 inch Schedule 80 464 338 213
5 5 inch Schedule 40 815 594 374
5 inch Schedule 80 736 537 338
6 6 inch Schedule 40 >1K* 859 541
6 inch Schedule 80 >1K* 770 485
Top of Page

Conduit
Trade Size
in Inches

AWG Wire Conductor Size
8 6 4
1⁄2 1/2 inch Schedule 40 3 1 1
1/2 inch Schedule 80 2 1 1
3⁄4 3/4 inch Schedule 40 5 4 2
3/4 inch Schedule 80 4 3 1
1 1 inch Schedule 40 9 6 4
1 inch Schedule 80 7 5 3
1 1⁄4 1 1/4 inch Schedule 40 16 11 7
1 1/4 inch Schedule 80 13 9 6
1 1⁄2 1 1/2 inch Schedule 40 21 15 9
1 1/2 inch Schedule 80 18 13 8
2 2 inch Schedule 40 36 26 16
2 inch Schedule 80 31 22 14
2 1⁄2 2 1/2 inch Schedule 40 51 37 22
2 1/2 inch Schedule 80 45 32 20
3 3 inch Schedule 40 79 57 35
3 inch Schedule 80 70 51 31
3 1⁄2 3 1/2 inch Schedule 40 106 77 47
3 1/2 inch Schedule 80 95 68 42
4 4 inch Schedule 40 137 99 61
4 inch Schedule 80 123 89 54
5 5 inch Schedule 40 216 156 96
5 inch Schedule 80 195 141 86
6 6 inch Schedule 40 312 225 138
6 inch Schedule 80 279 202 124
Top of Page

Conduit
Trade Size
in Inches

AWG Wire Conductor Size
3 2 1
1⁄2 1/2 inch Schedule 40 1 1 1
1/2 inch Schedule 80 1 1
3⁄4 3/4 inch Schedule 40 1 1 1
3/4 inch Schedule 80 1 1 1
1 1 inch Schedule 40 3 3 1
1 inch Schedule 80 3 2 1
1 1⁄4 1 1/4 inch Schedule 40 6 5 3
1 1/4 inch Schedule 80 5 4 3
1 1⁄2 1 1/2 inch Schedule 40 8 7 5
1 1/2 inch Schedule 80 7 6 4
2 2 inch Schedule 40 13 11 8
2 inch Schedule 80 12 10 7
2 1⁄2 2 1/2 inch Schedule 40 19 16 12
2 1/2 inch Schedule 80 17 14 10
3 3 inch Schedule 40 30 25 18
3 inch Schedule 80 26 22 16
3 1⁄2 3 1/2 inch Schedule 40 40 33 25
3 1/2 inch Schedule 80 35 30 22
4 4 inch Schedule 40 51 43 32
4 inch Schedule 80 46 39 29
5 5 inch Schedule 40 81 68 50
5 inch Schedule 80 73 61 45
6 6 inch Schedule 40 117 98 73
6 inch Schedule 80 105 88 65
Top of Page

Conduit
Trade Size
in Inches

AWG Wire Conductor Size
1/0 2/0 3/0
1⁄2 1/2 inch Schedule 40 1
1/2 inch Schedule 80
3⁄4 3/4 inch Schedule 40 1 1 1
3/4 inch Schedule 80 1 1 1
1 1 inch Schedule 40 1 1 1
1 inch Schedule 80 1 1 1
1 1⁄4 1 1/4 inch Schedule 40 3 2 1
1 1/4 inch Schedule 80 2 1 1
1 1⁄2 1 1/2 inch Schedule 40 4 3 3
1 1/2 inch Schedule 80 3 3 2
2 2 inch Schedule 40 7 6 5
2 inch Schedule 80 6 5 4
2 1⁄2 2 1/2 inch Schedule 40 10 8 7
2 1/2 inch Schedule 80 9 7 6
3 3 inch Schedule 40 15 13 11
3 inch Schedule 80 14 11 9
3 1⁄2 3 1/2 inch Schedule 40 21 17 14
3 1/2 inch Schedule 80 18 15 13
4 4 inch Schedule 40 27 22 18
4 inch Schedule 80 24 20 17
5 5 inch Schedule 40 42 35 29
5 inch Schedule 80 38 32 26
6 6 inch Schedule 40 61 51 42
6 inch Schedule 80 55 46 38
Top of Page

Conduit
Trade Size
in Inches

Wire Conductor Size
AWG MCM
4/0 250 300
1⁄2 1/2 inch Schedule 40
1/2 inch Schedule 80
3⁄4 3/4 inch Schedule 40 1
3/4 inch Schedule 80
1 1 inch Schedule 40 1 1 1
1 inch Schedule 80 1 1
1 1⁄4 1 1/4 inch Schedule 40 1 1 1
1 1/4 inch Schedule 80 1 1 1
1 1⁄2 1 1/2 inch Schedule 40 2 1 1
1 1/2 inch Schedule 80 1 1 1
2 2 inch Schedule 40 4 3 3
2 inch Schedule 80 3 3 2
2 1⁄2 2 1/2 inch Schedule 40 6 4 4
2 1/2 inch Schedule 80 5 4 3
3 3 inch Schedule 40 9 7 6
3 inch Schedule 80 8 6 5
3 1⁄2 3 1/2 inch Schedule 40 12 10 8
3 1/2 inch Schedule 80 10 8 7
4 4 inch Schedule 40 15 12 11
4 inch Schedule 80 14 11 9
5 5 inch Schedule 40 24 20 17
5 inch Schedule 80 22 18 15
6 6 inch Schedule 40 35 28 24
6 inch Schedule 80 31 25 22
Top of Page

Conduit
Trade Size
in Inches

MCM Wire Conductor Size (kcmil)
350 400 500
1⁄2 1/2 inch Schedule 40
1/2 inch Schedule 80
3⁄4 3/4 inch Schedule 40
3/4 inch Schedule 80
1 1 inch Schedule 40 1
1 inch Schedule 80
1 1⁄4 1 1/4 inch Schedule 40 1 1 1
1 1/4 inch Schedule 80 1 1 1
1 1⁄2 1 1/2 inch Schedule 40 1 1 1
1 1/2 inch Schedule 80 1 1 1
2 2 inch Schedule 40 2 1 1
2 inch Schedule 80 1 1 1
2 1⁄2 2 1/2 inch Schedule 40 3 3 2
2 1/2 inch Schedule 80 3 3 2
3 3 inch Schedule 40 5 5 4
3 inch Schedule 80 5 4 3
3 1⁄2 3 1/2 inch Schedule 40 7 6 5
3 1/2 inch Schedule 80 6 6 5
4 4 inch Schedule 40 9 8 7
4 inch Schedule 80 8 7 6
5 5 inch Schedule 40 15 13 11
5 inch Schedule 80 13 12 10
6 6 inch Schedule 40 21 19 16
6 inch Schedule 80 19 17 14
Top of Page

Conduit
Trade Size
in Inches

MCM Wire Conductor Size (kcmil)
600 700 750
1⁄2 1/2 inch Schedule 40
1/2 inch Schedule 80
3⁄4 3/4 inch Schedule 40
3/4 inch Schedule 80
1 1 inch Schedule 40
1 inch Schedule 80
1 1⁄4 1 1/4 inch Schedule 40 1
1 1/4 inch Schedule 80
1 1⁄2 1 1/2 inch Schedule 40 1 1 1
1 1/2 inch Schedule 80 1 1 1
2 2 inch Schedule 40 1 1 1
2 inch Schedule 80 1 1 1
2 1⁄2 2 1/2 inch Schedule 40 1 1 1
2 1/2 inch Schedule 80 1 1 1
3 3 inch Schedule 40 3 3 2
3 inch Schedule 80 3 2 2
3 1⁄2 3 1/2 inch Schedule 40 4 4 3
3 1/2 inch Schedule 80 4 3 3
4 4 inch Schedule 40 5 5 4
4 inch Schedule 80 5 4 4
5 5 inch Schedule 40 9 8 7
5 inch Schedule 80 8 7 7
6 6 inch Schedule 40 13 11 11
6 inch Schedule 80 12 10 9
Top of Page

Conduit
Trade Size
in Inches

MCM Wire Conductor Size (kcmil)
800 900 1000
1⁄2 1/2 inch Schedule 40
1/2 inch Schedule 80
3⁄4 3/4 inch Schedule 40
3/4 inch Schedule 80
1 1 inch Schedule 40
1 inch Schedule 80
1 1⁄4 1 1/4 inch Schedule 40
1 1/4 inch Schedule 80
1 1⁄2 1 1/2 inch Schedule 40 1 1
1 1/2 inch Schedule 80 1
2 2 inch Schedule 40 1 1 1
2 inch Schedule 80 1 1 1
2 1⁄2 2 1/2 inch Schedule 40 1 1 1
2 1/2 inch Schedule 80 1 1 1
3 3 inch Schedule 40 2 2 1
3 inch Schedule 80 2 1 1
3 1⁄2 3 1/2 inch Schedule 40 3 3 3
3 1/2 inch Schedule 80 3 3 2
4 4 inch Schedule 40 4 4 3
4 inch Schedule 80 4 3 3
5 5 inch Schedule 40 7 6 6
5 inch Schedule 80 6 6 5
6 6 inch Schedule 40 10 9 8
6 inch Schedule 80 9 8 7
Top of Page

*Please refer the National Electric Code of 2020 for the exact calculation.
Above information referenced from Table C.10, and Table C.11 in the National Electric Code (NEC) of 2020.
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 2020.

Electrical Metal Tubing (EMT) -- Table C.1 or our Conduit Fill Chart for EMT
Electrical Non-Metallic Tubing (ENT) -- Table C.2
Flexible Metallic Conduit -- Table C.3 or our Conduit Fill Chart for Flexible Metal Conduit
Intermediate Metal Conduit (IMC) -- Table C.4 or our Conduit Fill Chart for IMC
Liquidtight Flexible Non-Metallic Conduit (Type LFNC-A) -- Table C.5
Liquidtight Flexible Non-Metallic Conduit (Type LFNC-B) -- Table C.6
Liquidtight Flexible Non-Metallic Conduit (Type LFNC-C) -- Table C.7
Liquidtight Flexible Metallic Conduit (LFMC) -- Table C.8
Rigid Metallic Conduit -- Table C.9 or our Conduit Fill Chart for Rigid Metal Conduit
Rigid PVC Conduit, Schedule 80 -- Table C.10
Rigid PVC Conduit, Schedule 40 -- Table C.11
Type A PVC Conduit -- Table C.12
Type EB PVC Conduit -- Table C.13

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

Top of Page
%Item.Catalog% - %Item.ElliottDescription% - %Item.VendorName%
More Information
%CustomDescriptor%

From %Item.VendorName%, %Item.LongDescription%

%Price%
Item Details

%Price%
%Label%