
250 MCM THHN wire is a robust and versatile electrical wire designed to meet the demanding requirements of various industrial and commercial applications. Engineered with high-quality materials and advanced insulation technology, this wire ensures reliable performance in both dry and wet environments, making it a preferred choice for electrical installations that require durability and safety. 250 MCM THHN wire features a dual-layer insulation system, comprising a PVC core insulation and an outer Nylon sheath. This construction conforms to the requirements of Standard 83 and UL Standard 1063 (MTW), ensuring compliance with key industry safety and performance standards. With a minimum bending radius of 8 times the core diameter (8x core Ø), the 250 MCM THHN wire offers excellent flexibility during installation. This feature allows it to be easily routed through conduits and other tight spaces without risking damage to the wire.
Application
250 MCM THHN wire is widely used in various applications, suitable for use in service, feeder, and branch circuits, the wire ensures efficient power distribution across commercial and industrial facilities. THHN wire's flexibility and durability make it ideal for installation in conduits and cable trays, where it can be easily routed and protected. THHN wire's robust construction allows it to power heavy machinery and equipment in industrial settings, providing reliable performance even in demanding conditions.

Feature

• ASTM- B3, B8, and B787 (19 Wire Combination Unilay-Stranded)
• UL Standards 83, 758, 1063, and 1581
• CSA C22.2 No.75, T90 Nylon Sizes through 1000 kcmil
• FT2 - All Sizes
• Sunlight Resistant - Sizes 8 AWG and larger
• RoHS/REACH Compliant
• UL & BPS certification
• THHN or T90 Nylon- Dry locations not to exceed 90° C
• THWN- Wet locations not to exceed 75°C or dry locations not to exceed 90°C or locations not to exceed 75°C when exposed to oil
• THWN-2- Wetordry locations not exceed 90°C or locations not to exceed 75°C when exposed to oil
Certification
Our products have achieved various prestigious international certifications, including UL, TUV, EU CPR, CE, ROHS, and others.

Package

Production Line

The company always adheres to the business philosophy of "quality first, customer first", strictly follows international and industry standards for production and quality control, and its products have passed many international certifications such as UL, TUV, SAA, CE, etc., and are deeply trusted by domestic and foreign customers. We have an experienced R&D team, continuously invest in technological innovation, and continuously launch new products that meet market demand. The company is also equipped with advanced production equipment and complete testing facilities. From raw material procurement to finished product delivery, each process is strictly monitored to ensure the excellent quality of the products.
In addition to high-quality products, we are also committed to providing comprehensive customer service. Our professional sales and technical support team always keeps in close contact with customers, understands customer needs, provides tailor-made solutions, and ensures the successful implementation of each project. Over the years, our products have been exported to Southeast Asia, the Middle East, Africa, Europe, North America and other regions, and have won wide market recognition.
Case

Partner

FAQ
Q: What size is 250 MCM wire?
Q: How many amps is 250 MCM copper cable?
90°C (194°F) Rating in Dry Environments: 290 amps.
75°C (167°F) Rating in Wet Environments: 255 amps.
Q: Is 250 MCM the same as 4/0?
250 MCM (thousand circular mils) has a cross-sectional area of 250,000 circular mils.
4/0 AWG (American Wire Gauge) has a cross-sectional area of approximately 211,600 circular mils.
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| Conductor | Insulation Thickness (mils) | Jacket Thickness (mils) | Nominal 0.D.(mils) | Approx.Net Wt.Per 1000'(lbs.) | Allowable Ampacities+ | |||
| Size (AWG or kcmil) | No.of strands | 60℃ | 75℃ | 90℃ | ||||
| 14* | 1 | 15 | 4 | 102 | 15 | 15 | 15 | 15 |
| 12* | 1 | 15 | 4 | 119 | 23 | 20 | 20 | 20 |
| 10* | 1 | 20 | 4 | 150 | 36 | 30 | 30 | 30 |
| 14* | 19 | 15 | 4 | 109 | 16 | 15 | 15 | 15 |
| 12* | 19 | 15 | 4 | 128 | 24 | 20 | 20 | 20 |
| 10* | 19 | 20 | 4 | 161 | 38 | 30 | 30 | 30 |
| 8 | 19 | 30 | 5 | 213 | 63 | 40 | 50 | 55 |
| 6 | 19 | 30 | 5 | 249 | 95 | 55 | 65 | 75 |
| 4 | 19 | 40 | 6 | 318 | 152 | 70 | 85 | 100 |
| 3 | 19 | 40 | 6 | 346 | 189 | 85 | 100 | 115 |
| 2 | 19 | 40 | 6 | 378 | 234 | 95 | 115 | 130 |
| 1 | 19 | 50 | 7 | 435 | 299 | 110 | 130 | 145 |
| 1/0 | 19 | 50 | 7 | 474 | 372 | 125 | 150 | 170 |
| 2/0 | 19 | 50 | 7 | 518 | 462 | 145 | 175 | 195 |
| 3/0 | 19 | 50 | 7 | 568 | 575 | 165 | 200 | 225 |
| 4/0 | 19 | 50 | 7 | 624 | 718 | 195 | 230 | 260 |
| 250 | 37 | 60 | 8 | 694 | 851 | 215 | 255 | 290 |
| 300 | 37 | 60 | 8 | 747 | 1012 | 240 | 285 | 320 |
| 350 | 37 | 60 | 8 | 797 | 1174 | 260 | 310 | 350 |
| 400 | 37 | 60 | 8 | 842 | 1334 | 280 | 335 | 380 |
| 500 | 37 | 60 | 8 | 926 | 1655 | 320 | 380 | 430 |
| 600 | 61 | 70 | 9 | 1024 | 1987 | 350 | 420 | 475 |
| 750 | 61 | 70 | 9 | 1126 | 2464 | 400 | 475 | 535 |
| 1000 | 61 | 70 | 9 | 1275 | 3257 | 455 | 545 | 615 |






























