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THHN/THWN/THWN-2

THHN/THWN/THWN-2
Details:
THHN/THWN/THWN-2 wire is a versatile thermoplastic-insulated copper or aluminum conductor designed for general-purpose electrical wiring in residential, commercial, and industrial buildings. Known for its excellent heat, moisture, and flame resistance, this wire is commonly used in conduit systems for branch circuits and feeders.
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Description
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THHN/THWN/THWN-2 wire is a versatile thermoplastic-insulated copper or aluminum conductor designed for general-purpose electrical wiring in residential, commercial, and industrial buildings. Known for its excellent heat, moisture, and flame resistance, this wire is commonly used in conduit systems for branch circuits and feeders. At Zhejiang Zhongjing Wire & Cable Co., Ltd., we manufacture THHN/THWN/THWN-2 wire using high-conductivity annealed copper, coated with a tough polyvinyl chloride (PVC) insulation and nylon jacket. This construction ensures superior electrical performance, easy pulling through conduit, and long-term durability in harsh environments.

  • THHN (Thermoplastic High Heat-resistant Nylon-coated, 75°C Wet Rating)
  • THWN-2 (Thermoplastic Heat- and Water-resistant Nylon-Coated, 90°C Wet Rating)

Conductor: Bare copper or tin-plated copper, with optional solid or stranded structures.

 

Product Specifications

 

Name

THHN

THWN

THWN-2

Full Name

Thermoplastic High Heat-resistant Nylon-coated

Thermoplastic Heat and Water-resistant Nylon-coated

Thermoplastic Heat and Water-resistant Nylon-coated 2

Application Environment

Dry locations only

Wet and dry locations

Wet and dry locations

Insulation layer

Inner layer: PVC (providing basic insulation and flame retardancy).

Outer layer: Nylon sheath (enhances mechanical strength, wear resistance, chemical corrosion resistance).

Conductor

Bare copper or tin-plated copper, with optional solid or stranded structures.

Rated Temperature (Dry)

90°C

90°C

90°C

Rated Temperature (Wet)

Not applicable

75°C

90°C

Rated Voltage

600V

600V

600V

Typical Applications

Power wiring in dry locations

General purpose wiring for buildings (indoor/outdoor)

High-demand industrial and commercial wiring

Certification Standards

UL 83 / UL 1063 / UL 758

 

Product Advantages

THHN Core feature:

Rated temperature of 90°C (dry environment), but can withstand temperatures dropping to 75°C in humid environments.

 

THHN-2 Core feature:

Supports a working temperature of 90°C in both dry and humid environments, with stronger oil and water resistance

Moisture- and gasoline-resistant nylon jacket

Available in solid or stranded conductors

Suitable for 600V applications

Color-coded insulation for quick phase identification

THHNTHWNTHWN-2

 

Product Application

 

THHN:

Mainly used for industrial and building wiring in dry environments, such as factory cable trays and commercial building branch circuits.

Typical scenarios: internal wiring of machine tools, lighting systems in dry spaces.

THWN-2:

Preferred for damp/outdoor scenes: underground conduits, oil platforms, and chemical equipment (oil resistant and waterproof).

Directly buried installation (without mechanical damage risk) and UV-resistant outdoor overhead power lines.

 

Technical Data

 

THHN/THHN-2 AWG Standard Table

AWG

One Cond.

Cond.Count

Full Cond.Dia.

Cond.Cross-Sec.

Resistance

Insul.

Nylon

Overall Dia.

(mm)

(mil)

(mm)

(inch)

(mm2)

(kcmil)

0/km

(mm)

(inch)

(mm)

(inch)

(mm)

(inch)

0000(4/0)

2.680

5290

19X2.680

11.6840

0.4600

107.2193

211.600

0.16

1.27

0.050

0.18

0.007

16.30

0.64

000(3/0)

2.387

4710

19X2.387

10.4038

0.4096

85.0114

167.772

0.20

1.27

0.050

0.18

0.007

14.85

0.58

00(2/0)

2.126

4195

19X2.12

9.2659

0.3648

67.4321

133.079

0.26

1.27

0.050

0.18

0.007

13.50

0.53

0(1/0)

1.893

3736

19X1.89

8.2525

0.3249

53.4880

105.560

0.32

1.27

0.050

0.18

0.007

12.35

0.49
 

0

3.119

6156

7X3.119

8.2525

0.3249

53.4880

105.560

0.32

1.27

0.050

0.18

0.007

11.24

0.44

0

1.893

3736

19X1.893

8.2525

0.3249

53.4880

105.560

0.32

1.27

0.050

0.18

0.007

11.35

0.45

2

2.473

4881

7X2.473

6.5430

0.2576

33.6240

66.358

0.51

1.02

0.040

0.15

0.006

9.75

0.38

2

1.501

2962

19X(1.50

6.5430

0.2576

33.6240

66.358

0.51

1.02

0.040

0.15

0.006

9.84

0.39

4

1.961

3871

7X1.961

5.1892

0.2043

21.1492

41.738

0.82

1.02

0.040

0.15

0.006

8.22

0.32

4

1.190

2349

19X1.19

5.1892

0.2043

21.1492

41.738

0.82

1.02

0.040

0.15

0.006

8.29

0.33

6

1.555

3069

7X1.555

4.1148

0.1620

13.2980

26.244

1.30

0.76

0.030

0.13

0.005

6.43

0.25

6

0.944

1863

19X0.944

4.1148

0.1620

13.2980

26.244

1.30

0.76

0.030

0.13

0.005

6.53

0.2

8

1.234

2435

7X1.234

3.2639

0.1285

8.3669

16.512

2.06

0.76

0.030

0.13

0.005

5.47

0.22

8

0.749

1478

19X0.75

3.2639

0.1285

8.3669

16.512

2.06

0.76

0.030

0.13

0.005

5.53

0.22

10

0.978

1931

7X1.00

2.5883

0.1019

5.2615

10.384

3.28

0.51

0.020

0.10

0.004

4.22

0.17

10

0.594

1172

19X0.594

2.5883

0.1019

5.2615

10.384

3.28

0.51

0.020

0.10

0.004

4.22

0.17

12

0.776

1531

7X0.776

2.0523

0.0808

3.3081

6.529

5.21

0.38

0.015

0.10

0.004

3.36

0.13

12

0.471

929

19X0.471

2.0523

0.0808

3.3081

6.529

5.21

0.38

0.015

0.10

0.004

3.32

0.13

14

0.615

1214

7X0.615

1.6282

0.0641

2.0820

4.109

8.28

0.38

0.015

0.10

0.004

2.86

0.11

14

0.374

737

19X0.374

1.6282

0.0641

2.0820

4.109

8.28

0.38

0.015

0.10

0.004

2.86

0.11

16

0.488

962

7X0.488

1.2903

0.0508

1.3076

2.581

13.18

0.38

0.015

0.10

0.004

2.43

0.10

16

0.296

584

19X0.296

1.2903

0.0508

1.3076

2.581

13.18

0.38

0.015

0.10

0.004

2.46

0.10
 

8

3.264

6441

1X3.264

3.2639

0.1285

8.3669

16.512

2.06

0.76

0.030

0.13

0.005

5.04

0.20

10

2.588

5108

1X2.588

2.5883

0.1019

5.2615

10.384

3.28

0.51

0.020

0.10

0.004

3.81

0.15

12

2.052

4050

1X2.052

2.0523

0.0808

3.3081

6.529

5.21

0.38

0.015

0.10

0.004

3.01

0.12

14

1.628

3213

1X1.628

1.6282

0.0641

2.0820

4.109

8.28

0.38

0.015

0.10

0.004

2.59

0.10

16

1.290

2546

1X1.290

1.2903

0.0508

1.3076

2.581

13.18

0.38

0.015

0.10

0.004

2.25

0.09

18

1.024

2020

1X1.024

1.0236

0.0403

0.8229

1.624

20.95

0.38

0.015

0.10

0.004

1.98

0.08

20

0.813

1604

1X0.813

0.8128

0.0320

0.5189

1.024

33.23

0.38

0.015

0.10

0.004

1.77

0.07

 

Quality Assurance & Certifications

 

Zhejiang Zhongjing Wire & Cable Co., Ltd. follows a strict quality control process:

  • 100% conductor resistance and insulation breakdown testing
  • Flame-retardancy and aging tests according to UL & CSA standards
  • ISO 9001:2015 certified production lines
  • Certified by UL, CSA, RoHS, and CE
  • Third-party inspection support upon request

All THHN/THWN/THWN-2 wires are produced in compliance with international safety and performance standards.

 

Packaging & Logistics

 

1. Packed in wooden reels, plastic spools, or coil rolls

2. Reel sizes are customizable based on cable length and customer requirements

3. Export-standard labeling with clear specification and traceability

4. Ocean, air, or rail freight shipping is available worldwide

5. Includes packing list, CO, MSDS, and customs documentation

 

After-Sales Service

 

We provide professional support from inquiry to installation:

1. Installation guidance and electrical data sheets

2. 24/7 online technical consultation

3. Replacement guarantee for manufacturing defects

4. Optional OEM and custom branding services

5. Long-term maintenance cooperation (for bulk buyers)

 

Our-Company

Our-Exhibitions

 

FAQ

 

Q: What's the difference between THHN, THWN, and THWN-2?

A: THHN is rated for dry locations up to 90°C. THWN adds wet-location capability up to 75°C. THWN-2 is rated for both wet and dry environments up to 90°C, making it the most flexible option.

Q: Can THHN/THWN/THWN-2 wire be used underground?

A: Yes, THWN-2 is approved for underground installation when used in conduit, offering moisture resistance and excellent heat tolerance.

Q: What certifications do you offer?

A: Our wires are certified by UL, CSA, RoHS, and CE, and we follow ISO 9001:2015 quality management throughout the production process.

Q: What is a PVC insulated nylon sheathed cable, and how is it used?

A: A PVC insulated nylon sheathed cable consists of a copper or aluminum conductor, a PVC inner insulation, and a durable nylon outer sheath. It's commonly used in conduit wiring for power distribution in buildings due to its excellent abrasion resistance and thermal stability.

Q: Is Nylon Sheathed Wire better than standard building wire?

A: Yes. Nylon Sheathed Wire provides superior resistance to chemicals, oils, and moisture compared to standard PVC-only wires. Its nylon coating reduces friction during installation, making it ideal for long conduit runs and dense wiring applications.

Q: Are THHN/THWN-2 cables suitable for outdoor use?

A: Yes. THHN/THWN-2 cables are moisture- and sunlight-resistant, making them safe for outdoor installations in conduit, including underground applications. The THWN-2 rating ensures performance in wet environments up to 90°C.

Q: Can you customize THHN/THWN-2 cable lengths and packaging for large orders?

A: Absolutely. Zhejiang Zhongjing Wire & Cable Co., Ltd offers full customization, including length per reel, color, labeling, and export packaging for bulk or OEM orders of THHN/THWN-2 cables.
Looking for a reliable supplier of THHN/THWN/THWN-2 electrical wire?
Contact Zhejiang Zhongjing Wire & Cable Co., Ltd for samples, technical specifications, and competitive pricing tailored to your project.

 

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