Southwire® Machine Flex® Power PVC THHN — 300 kcmil, Black. Single-conductor, high-strand-count flexible THHN/THWN-2 building wire with an added MTW (Machine Tool Wire) rating. Engineered for the tight bend radii and vibration of AI data center power distribution, switchgear, panel builds, VFD leads, and machine wiring. Rated for Cable Tray (CT) use.
Ratings: 600V, 90°C wet or dry (130°C emergency overload, 150°C short circuit). Type THHN/THWN-2, MTW, AWM. Oil & gasoline resistant. Sunlight resistant. UL VW-1 and CSA FT1 & FT4 flame rated. Made in America (Buy American / Buy America Act compliant).
Construction: Class I flexible stranded bare copper conductor (741 strands), PVC insulation with nylon jacket.
Specifications (300 kcmil):
- Conductor: Class I flexible stranded bare copper — 741 strands
- Diameter over conductor: 0.638 in
- Insulation thickness: 70 mil
- Insulation color: Black
- Approx. overall diameter: 0.78 in
- Copper weight: 929 lb/1000 ft
- Approx. cable weight: 1024 lb/1000 ft
- Allowable ampacity: 285 A @ 75°C / 320 A @ 90°C
- DC resistance @ 25°C: 0.039 Ω/1000 ft
- Voltage: 600V
Sold per foot (cut to length). Call for pricing and availability. Additional insulation colors are available for many sizes — contact us for the corresponding Southwire stock number.
Reference: Southwire SPEC 44066.
