conduit fill chart for intermediate metal conduit imc, galvanized rigid steel rmc, electrical metal tubing emt, and flexible metal conduit

ENT Conduit Fill Table for Non-Metallic Flexible, Corrugated Tubing

This conduit fill chart is used to determine how many wires can be safely put into ENT conduit tube. Each row going across is a different size of ENT Conduit, also called Electrical Non-Metallic Tubing. Each column (going up and down) is a different gauge of wire, either AWG or MCM. The results show the allowable number of wires for each size/type of conduit and wire, based on the 2020 NEC® code for electrical conduit.

See Also:

ENT Conduit Fill Chart

Conduit
Trade Size
in Inches

Wire Size (THHN, THWN, THWN-2) Conductor Size
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
1⁄2 inch ENT Conduit 11 8 5 3 1 1 1 1 1 1
3⁄4 inch ENT Conduit 21 15 9 5 4 2 1 1 1 1 1 1 1
1 inch ENT Conduit 34 25 15 9 6 4 3 3 1 1 1 1 1 1 1 1
1 1⁄4 inch ENT Conduit 60 43 27 16 11 7 6 5 3 3 2 1 1 1 1 1 1 1 1
1 1⁄2 inch ENT Conduit 82 59 37 21 15 9 8 7 5 4 3 3 2 1 1 1 1 1 1 1 1
2 inch ENT Conduit 135 99 62 36 26 16 13 11 8 7 6 5 4 3 3 2 1 1 1 1 1

Wire Size

To jump to the section of the 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 ↓

ENT Conduit Fill Charts

Conduit
Trade Size
in
Inches

AWG Wire Size (THHN, THWN, THWN-2)
Conductor Size
14 12 10
1⁄2 inch ENT Conduit 11 8 5
3⁄4 inch ENT Conduit 21 15 9
1 inch ENT Conduit 34 25 15
1 1⁄4 inch ENT Conduit 60 43 27
1 1⁄2 inch ENT Conduit 82 59 37
2 inch ENT Conduit 135 99 62
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Conduit
Trade Size
in
Inches

AWG Wire Size (THHN, THWN, THWN-2)
Conductor Size
8 6 4
1⁄2 inch ENT Conduit 3 1 1
3⁄4 inch ENT Conduit 5 4 2
1 inch ENT Conduit 9 6 4
1 1⁄4 inch ENT Conduit 16 11 7
1 1⁄2 inch ENT Conduit 21 15 9
2 inch ENT Conduit 36 26 16
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Conduit
Trade Size
in
Inches

AWG Wire Size (THHN, THWN, THWN-2)
Conductor Size
3 2 1
1⁄2 inch ENT Conduit 1 1 1
3⁄4 inch ENT Conduit 1 1 1
1 inch ENT Conduit 3 3 1
1 1⁄4 inch ENT Conduit 6 5 3
1 1⁄2 inch ENT Conduit 8 7 5
2 inch ENT Conduit 13 11 8
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Conduit
Trade Size
in
Inches

AWG Wire Size (THHN, THWN, THWN-2)
Conductor Size
1/0 2/0 3/0
1⁄2 inch ENT Conduit 1
3⁄4 inch ENT Conduit 1 1 1
1 inch ENT Conduit 1 1 1
1 1⁄4 inch ENT Conduit 3 2 1
1 1⁄2 inch ENT Conduit 4 3 3
2 inch ENT Conduit 7 6 5
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Conduit
Trade Size
in
Inches

Wire Size (THHN, THWN, THWN-2)
Conductor Size AWG/kcmil
4/0 250 300
1⁄2 inch ENT Conduit
3⁄4 inch ENT Conduit 1
1 inch ENT Conduit 1 1 1
1 1⁄4 inch ENT Conduit 1 1 1
1 1⁄2 inch ENT Conduit 2 1 1
2 inch ENT Conduit 4 3 3
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Conduit
Trade Size
in
Inches

MCM Wire Size (THHN, THWN, THWN-2)
Conductor Size kcmil
350 400 500
1⁄2 inch ENT Conduit
3⁄4 inch ENT Conduit
1 inch ENT Conduit 1
1 1⁄4 inch ENT Conduit 1 1 1
1 1⁄2 inch ENT Conduit 1 1 1
2 inch ENT Conduit 2 1 1
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Conduit
Trade Size
in
Inches

MCM Wire Size (THHN, THWN, THWN-2)
Conductor Size kcmil
600 700 750
1⁄2 inch ENT Conduit
3⁄4 inch ENT Conduit
1 inch ENT Conduit
1 1⁄4 inch ENT Conduit 1
1 1⁄2 inch ENT Conduit 1 1 1
2 inch ENT Conduit 1 1 1
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How did Smurf Tube Get Its Name?

ENT conduit tube is commonly called smurf tube because ENT conduit is often a blue color reminiscent of blue cartoon Smurf™ characters. Although smurf tube is typically blue, ENT conduit also comes in other colors like red, orange, and yellow.

What is ENT Conduit?

ENT Conduit, also called Electrical NonMetallic Tubing or smurf tube, is a lightweight, corrugated, flexible tubing made of PVC plastic. Building electrical wires may be routed inside ENT conduit to protect the wires. Because ENT conduit is made from PVC plastic, it can be used in wet environments where metal conduit would corrode. The corrugated PVC makes ENT more flexible than other PVC conduit.

Shop ENT Conduit, Fittings, Wire & Other Types of Electrical Conduit

ENT Flexible Conduit

ENT Flexible Metal Conduit

Shop Flexible ENT Conduit

Flexible Metal Conduit

Flexible Metal Conduit

Shop Flexible Metal Conduit

Liquidtight LFNC Conduit

LFNC Conduit

Shop LFNC Conduit

Liquidtight LFMC Conduit

LFMC Conduit

Shop LFMC Conduit

Rigid Metal Conduit

Rigid Metal Conduit

Shop Rigid Metal Conduit

EMT Conduit

EMT Conduit

Shop EMT Conduit

IMC Conduit

IMC Conduit

Shop IMC Conduit

THWN & THHN Wire

THWN and THHN Building Wire and Cable

Shop THWN & THHN Wire

More Conduit, Wire, and Cable Guides:

The ENT Conduit or Smurf Tube Fill Chart above references information from Table C.2 in the 2020 NEC® (National Electric Code®).
For more information on the following types of conduit, please see our conduit fill charts below, which are based directly on Appendix C of the National Electric Code® (NEC®) of 2020.

Electrical Metallic Tubing Conduit (Type EMT) -- see our EMT Conduit Fill Chart or EMT Conduit Fill Chart for Compact Wire
Flexible Metal Conduit (Type FMC) -- see our FMC Conduit Fill Chart
Liquidtight Flexible Non-Metallic Conduit (Types LFNC-A, LFNC-B, LFNC-C) -- see our Liquid Tight Flexible Conduit Fill Chart
Intermediate Metal Conduit (Type IMC) -- see our IMC Conduit Fill Chart or IMC Conduit Fill Chart for Compact Wire
Rigid Metal Conduit (Type RMC) -- see our RMC Conduit Fill Chart or RMC Conduit Fill Chart for Compact Wire
Rigid PVC Conduit, Schedule 80 -- see our Rigid Schedule 80 PVC Conduit Fill Chart
Rigid PVC Conduit, Schedule 40 -- see our Rigid Schedule 40 PVC Conduit Fill Chart
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.

Warning: When using this information to perform electrical work, call a licensed electrician and consult the NEC® for safety. All licensed electricians have passed examinations covering the National Electric Code®, know state and local building codes, and may carry insurance to cover damages.