600 Volt THW THW-2 12AWG 4AWG 90C PVC Insulation Green Copper Wire Cable Summary​ The 600 Volt THW and THW-2 copper wire cables, available in 12AWG and 4AWG with 90°C-rated PVC insulation and green coloring, are engineered for safe and efficient electrical grounding and power distribution in residential, commercial, and industrial systems. The green insulation universally signifies grounding or bonding applications, ensuring clear identification and compliance with safety standards.​ Crafted with high-purity stranded copper conductors, these cables deliver low resistance and efficient current transmission, critical for grounding circuits that redirect fault currents. The THW and THW-2 designations indicate thermoplastic insulation resistant to heat, moisture, and chemicals—THW-2 enhances durability for more demanding environments. With a 90°C temperature rating, they withstand high heat from continuous operation or ambient conditions, making them suitable for HVAC systems, industrial machinery, and outdoor installations.​ The 12AWG variant handles moderate grounding loads in lighting and small appliance circuits, while 4AWG supports heavy-duty applications like main panel grounding and industrial equipment. Both sizes comply with international standards (e.g., NEC), featuring flame-retardant PVC for added safety. Their flexibility simplifies installation in conduits or tight spaces, making them a reliable choice for ensuring electrical system integrity.