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Phelps Dodge THHN/THWN-2 Wires are made of virgin copper ensuring a smooth flow of electric current. It is designed to meet the highest international standards for quality and safety, making it suitable for a wide range of industrial and residential applications. Phelps Dodge THHN/THWN-2 Wires are durable, strong, and long-lasting. Its insulation is flame retardant which ensures that it can self-extinguish within seconds during fire providing enhanced safety to houses, buildings, and/or any industrial facilities.