THHW cables use 100% soft annealed copper conductors that meet ASTM B172 standards and contain no aluminum, ensuring stable and reliable conductivity. The conductor is a 30 AWG ultra-fine multi-strand twisted structure (Class K), which has excellent flexibility and is particularly suitable for scenarios that require frequent bending or dynamic use. The cable insulation uses high dielectric strength extruded PVC material, which not only has good mechanical strength but also has excellent oil, heat, acid, and moisture resistance. The temperature rating of THHW cables is -40°F to 221°F (-40°C to 105°C), and they can operate stably in extreme environments.
Application
THHW cables are widely used in fixed wiring systems in industrial, commercial, and residential areas, and are particularly suitable for complex environments that require resistance to high temperatures, oils, acids, and moisture. Its excellent flexibility makes it very suitable for wire connections in power distribution systems, internal wiring in electrical control cabinets, lighting systems, and power lines for electric equipment. Due to its rated temperature of up to 105°C (in a dry environment), it is also suitable for high-temperature operating equipment such as motors, transformers, and large machinery. In addition, THHW cables are often used in factory automation, production line control systems, and highly corrosive environments such as metallurgy and chemical industry to ensure the long-term and stable operation of electrical systems.
Feature
THHN cables use thermoplastic PVC insulation and nylon sheaths to improve wear resistance and mechanical protection; the rated temperature can reach 90°C in dry environments, and some can reach 105°C; their use restrictions need to be considered more carefully in applications with high humidity.
THHW cables use PVC insulation, but are designed for heat resistance and waterproofing. They have stronger waterproof and chemical corrosion resistance and are suitable for use outdoors or in pipelines. They are rated at 105°C and emphasize stable performance in humid environments.
Certification
THHW cables are UL certified and meet strict safety requirements in terms of conductor structure, electrical performance, insulation strength and flame retardancy. At the same time, THHW cables are also CSA (Canadian Standards Association) certified, comply with Canadian electrical codes, and are suitable for installation and application in the local Canadian market. These certifications indicate that the products not only meet the application specifications in the US National Electrical Code (NFPA 70), but also meet the requirements for laying in a variety of wet or dry environments.
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Production Line
Greater Wire is an experienced THHW cable manufacturer that specializes in producing high-quality electrical cables that meet UL and CSA standards for a wide range of applications in industry, construction, power distribution systems, and more. Our cables use 100% annealed copper conductors and have excellent resistance to heat, moisture, oil, and acid. They meet UL standards and are dual-certified by UL and CSA for safe and stable operation in dry or wet environments. We strictly implement ASTM specifications during the manufacturing process, and each roll of cable has reliable electrical performance and excellent flexibility.
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FAQ
Q: What is the difference between XHHW and THHW?
Q: What is the temperature rating of a type THHW conductor in a wet location?
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| AWG | MM2 |
Bare copper Stranding Qty/AWG |
Nominal OD | Wall Thickness | Ampacity** Dry |
Ampacity** Wet |
| 10 | 5.26 | 105/30 | .178'' | .030'' | 105 | 90 |
| 8 | 8.37 | 168/30 | .239'' | .045'' | 105 | 90 |
| 6 | 13.3 | 259/30 | .326'' | .060'' | 105 | 95 |
| 4 | 21.15 | 420/30 | .378'' | .060'' | 140 | 125 |
| 2 | 33.61 | 665/30 | .485'' | .060'' | 190 | 170 |
| 1 | 42.40 | 836/30 | .550'' | .080'' | 220 | 195 |
| 1/0 | 53.50 | 1064/30 | .625'' | .080'' | 260 | 230 |
| 2/0 | 67.40 | 1323/30 | .650'' | .080'' | 300 | 265 |
| 3/0 | 85.00 | 1666/30 | .710'' | .080'' | 350 | 310 |
| 4/0 | 107.00 | 2107/30 | .805'' | .080'' | 405 | 360 |
| 250MCM | 127.00 | 2499/30 | .880'' | .095'' | 455 | 405 |
| 500MCM | 253.00 | 5054/30 | 1.160'' | .095'' | 700 | 620 |
| 750MCM | 380.00 | 7448/30 | 1.380'' | .110'' | 885 | 785 |
