Building Wire -Copper -THWN or THHN
(PVC Insulation, Nylon Jacket, 600 Volts)
DESCRIPTION
THHN (Thermoplastic High Heat-Resistant Nylon-Coated) and THWN (Thermoplastic Heat- and Water-Resistant Nylon-Coated) wires are 600V-rated copper conductors with PVC insulation and nylon sheath, widely used in conduits, raceways, and control circuits.
THHN is intended for dry locations up to 90°C, while THWN is also suitable for wet environments up to 75°C. These wires are among the most commonly used in U.S. residential and commercial building projects.
APPLICATION
General purpose wiring in accordance with the National Electrical Code, maximum conductor temperature of 90°C in dry locations and 75°C in wet locations, 600 volts, for installation in conduit or other recognized raceway. Also used for wiring of machine tools (stranded), appliances, and control circuits not exceeding 600 volts.
These conductors have multiple ratings. Depending upon the product application, allowable temperatures are as follows:
| • THHN or T90 Nylon- Dry locations not to exceed 90ºC |
| • THWN-2- Wet or dry locations not to exceed 90° C or locations not to exceed 75ºC when exposed to oil |
| • THWN- Wet locations not to exceed 75ºC or dry locations not to exceed 90° C or locations not to exceed 75ºC when exposed to oil |
| • TWN75- Wet locations not to exceed 75ºC |
| • MTW- Wet locations or when exposed to oil at temperatures not to exceed 60° C or dry locations not to exceed 90ºC (with ampacity limited to that for 75ºC conductor temperature per NFPA 79) |
| • AWM- Dry locations not to exceed 105ºC only when rated and used as appliance wiring material |
CONSTRUCTION
CU THHN/THWN(-2) conductors are made with soft drawn copper. Sizes 14 through 4/0 AWG use a combination-unilay stranding while 250 kcmil and larger sizes use a compressed copper stranding. The wire is covered with a tough heat and moisture resistant PVC insulation with an overall nylon jacket. Available in black, white, red, blue, purple, green, yellow, orange, brown, and gray. Some colors are subject to economic order quantity.
SPECIFICATION
ASTM B3: Annealed or soft copper wires.
ASTM B8: Concentric Layered Copper Stranded Conductors.
ASTM B787: 19 Wire Combination Unilay-Stranded Copper Conductors for Subsequent Insulation.
UL 83: Wires and cables insulated with thermoplastic material.
THWN or THHN STANDARDS
| Conductor |
Insulation thickness |
Jacket thickness |
Approx. weight |
Ampacity |
| AWG/kcmil |
No. |
mm |
mils |
mm |
mils |
kg/km |
lb/kft |
75ºC |
90ºC |
| 14 |
1 |
0.38 |
15 |
0.1 |
4 |
22 |
15 |
15 |
15 |
| 12 |
1 |
0.38 |
15 |
0.1 |
4 |
34 |
23 |
20 |
20 |
| 10 |
1 |
0.51 |
20 |
0.1 |
4 |
54 |
36 |
30 |
30 |
| 14 |
7 |
0.38 |
15 |
0.1 |
4 |
24 |
16 |
15 |
15 |
| 12 |
7 |
0.38 |
15 |
0.1 |
4 |
36 |
24 |
20 |
20 |
| 10 |
7 |
0.51 |
20 |
0.1 |
4 |
57 |
38 |
30 |
30 |
| 8 |
7 |
0.76 |
30 |
0.13 |
5 |
94 |
63 |
50 |
55 |
| 6 |
7 |
0.76 |
30 |
0.13 |
5 |
141 |
95 |
65 |
75 |
| 4 |
7 |
1.02 |
40 |
0.15 |
6 |
226 |
152 |
85 |
100 |
| 3 |
7 |
1.02 |
40 |
0.15 |
6 |
281 |
189 |
100 |
115 |
| 2 |
7 |
1.02 |
40 |
0.15 |
6 |
348 |
234 |
115 |
130 |
| 1 |
19 |
1.27 |
50 |
0.18 |
7 |
445 |
299 |
130 |
145 |
| 1/0 |
19 |
1.27 |
50 |
0.18 |
7 |
554 |
372 |
150 |
170 |
| 2/0 |
19 |
1.27 |
50 |
0.18 |
7 |
688 |
462 |
175 |
195 |
| 3/0 |
19 |
1.27 |
50 |
0.18 |
7 |
856 |
575 |
200 |
225 |
| 4/0 |
19 |
1.27 |
50 |
0.18 |
7 |
1068 |
718 |
230 |
260 |
| 250 |
37 |
1.52 |
60 |
0.2 |
8 |
1266 |
851 |
255 |
290 |
| 300 |
37 |
1.52 |
60 |
0.2 |
8 |
1506 |
1012 |
285 |
320 |
| 350 |
37 |
1.52 |
60 |
0.2 |
8 |
1747 |
1174 |
310 |
350 |
| 400 |
37 |
1.52 |
60 |
0.2 |
8 |
1985 |
1334 |
335 |
380 |
| 500 |
37 |
1.52 |
60 |
0.2 |
8 |
2463 |
1655 |
380 |
430 |
| 600 |
61 |
1.78 |
70 |
0.23 |
9 |
2957 |
1987 |
420 |
475 |
| 750 |
61 |
1.78 |
70 |
0.23 |
9 |
3667 |
2464 |
475 |
535 |
| 1000 |
61 |
1.78 |
70 |
0.23 |
9 |
4847 |
3257 |
545 |
615 |
+Allowable ampacities shown are for general use as specified by the 2014 Edition of the National Electrical Code Sections 310.15 and 240.4(D). Unless the equipment is marked for use at higher temperatures the conductor shall be limited to the following per NEC 110.14(C):
75ºC - When terminated to equipment for circuits rated over 100 amperes or marked for conductors larger than 1 AWG.
90ºC - THHN dry locations and THWN-2 wet or dry locations for ampacity adjustment purposes using NEC section 310.15.
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Company Information
Henan Xunda Cable Co., Ltd., established in 2001, is a manufacturer specializing in the R&D and production of high-quality wires and cables. With over 20 years of experience, we provide reliable cable solutions, strengthened by our subsidiary, Xina Cable, for global reach and better service.
We produce a wide range of cables, including AAC, AAAC, ACSR, Power Cables (up to 35KV), Control Cables, Concentric Cables, Solar Cables, Building Wires, Nylon Wires, LSOH wires, and Branch Cables. Our products are widely used in power transmission, petrochemicals, metallurgy, construction, and infrastructure projects.
Located in the Industrial Zone of Gongyi, Zhengzhou City, Henan, China, our 30,000m2 factory employs over 100 staff, including 20 senior technicians. With 30+ advanced production lines including high-speed drawing, stranding, and extrusion equipment, our daily bare conductor production capacity achieves more than 100 tons. Our strict quality control system and full-scale testing equipment ensure all products comply with ISO9001, CCC, and international standards, ensuring safety, durability, and reliability.
We have exported to over 20 countries, including Chile, Dominica, Panama, Colombia, Nicaragua, Peru, Philippines, Vietnam, Malaysia, Australia, PNG, Burundi, Tanzania, Madagascar, Angola among others. We provide 48-hour technical support, flexible payments, and efficient logistics for smooth transactions and timely delivery.
Our mission: Transmit Light, Connect World, Create Win-win, Grow together!
FAQ
Your questions illuminate better solutions- we welcome any additional inquiries.
Q1: Are you a factory or trading company?
A1: Manufacturing base in Henan ,China, with more than 150 workers.
Q2: How can I visit there?
A2: Sure,lf you need,we will arrange the driver to pick you up.
Q3: How can I get some samples?
A3: Contact me on below, determine sample and address for shipping.
Q4: What is your MOQ?
A4: MOQ Normally 1km for insulated cables(1 ton for bare conductor). Please contact me for detail info if you have specific cable requirement.
Q5: Have you ever supplied cables to our country?
A5: Xunda Cable have been sold to over 30 countries and regions in the world. you can contact me for details.
Q6: When can l get the price?
A6: Usually quote within 3 hours after we get your inquiry.
Q7: How long is your delivery time?
A7: According to your order's quantity.Usually our lead time is 3 - 20 working days.
Q8: How do you guarantee quality?
A8: 100% inspection before delivery; Full set of testing equipment.
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