300 MCM THHN wire is constructed using either solid or stranded soft-drawn copper, which conforms to ASTM Standards. The copper conductor provides excellent electrical conductivity, ensuring efficient power transmission with minimal energy loss.
The wire features heat and moisture-resistant polyvinyl chloride (PVC) insulation, which is color-coded for easy identification during installation. The PVC insulation is designed to withstand high temperatures and harsh environmental conditions, making it ideal for a wide range of applications.
Over the PVC insulation, the wire is coated with a clear nylon (polyamide) jacket or a UL-listed equivalent. This additional layer provides enhanced abrasion resistance, protecting the wire from physical damage during installation and throughout its service life.
Application
350MCM 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
Greater Wire is at the forefront of innovation, seamlessly integrating smart and digital technologies into our manufacturing processes to elevate production speed while maintaining the highest quality standards. With automated production equipment boasting precision accuracy down to 0.002mm, we ensure that every wire and cable meets rigorous specifications. Each product undergoes a thorough 100% inspection throughout the entire production and quality control process, marking a new standard in precision and efficiency. Our advanced manufacturing setup eliminates the common errors and defects associated with manual assembly, delivering a level of reliability that sets us apart in the industry.
Case
Partner
FAQ
Q: What size wire is 300MCM?
Cross-Sectional Area: The cross-sectional area of 300 MCM wire is 300,000 circular mils. In square millimeters, this is approximately 152 mm².
Q: What wire is good for 300 amps?
300 MCM Copper Wire: This wire size is also commonly used and provides some extra capacity.
350 MCM Aluminum Wire: Aluminum wires need to be larger than copper wires to carry the same amount of current due to their lower conductivity. A 350 MCM aluminum wire is commonly used for 300 amps.
Q: What does MCM mean for wire?
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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 |
