300 MCM THHN/THWN-2 Copper Building Wire

  • According to UL Standard
  • Approved by ISO, CE, SGS, UL
  • Place of Origin: Henan, China
  • Production Process: PVC+Nylon
  • HS Code: 8544492100
  • Color: red, black, green, blue, etc.
  • MOQ: 1000 Meters
  • Low Voltage

300 mcm thhn wire, where MCM stands for “thousand circular mils,” is a heavy-duty electrical wire that can carry substantial currents and is suitable for use in building wiring, conduit, and branch circuits, and service entrance. 300 mcm wire to mm2 is approximately 152mm². 300 kcmil thhn wire conductors are made of annealed soft copper and meet BS standards, while the 300 mcm aluminum wire variant is also available.

300 MCM THHN Wire Specification:

  • Conductor: 37 Strands
  • Insulation: PVC
  • 300 mcm wire diameter: 19.3 mm
  • Sheath Color: Red, yellow, blue, green, black, and white, etc.
  • Temperature Range: -10°C – +90°C
  • Rated voltage: 600V
  • Weight: 1541 KG per KM

FAQ About 300 MCM THHN Wire

300 mcm thhn copper wire overall diameter is 19.3mm.

The amperage of 300 kcmil copper wire varies depending on several factors, including insulation type, ambient temperature, and installation conditions. Under standard conditions, such as an ambient temperature of 30°C (86°F), the amperage of 300 kcmil thhhn wire ranges from approximately 285 to 350 amps. The allowable ampacity in a duct for 300 MCM THHN copper building wire is 320 amps​.

The price of 300 kcmil copper wire per foot can vary widely based on factors such as the current market price of copper. Based on LME Copper 8472 per ton the price is USD 19 per foot.

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