{"product_id":"thhncu-generic-thhn300mcmstrgrymr-thhn-300-kcmil-copper-wire","title":"Thhncu-generic thhn300mcmstrgrymr Thhn 300 Kcmil Copper Wire","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe THHNCU-GENERIC thhn300mcmstrgrymr is a 300 kcmil stranded copper conductor THHN building wire with gray PVC insulation and a nylon jacket. Rated for 600 volts and up to 90 degrees C in dry environments, it carries up to 320 amps at 90 degrees C, making it suitable for high-ampacity feeder and branch-circuit runs. The 37-strand construction adds flexibility for pulling through conduit in tight commercial and industrial installations. Licensed electricians and electrical contractors install this wire type in accordance with NEC requirements for conduit-enclosed wiring systems.\u003c\/p\u003e\n\u003cp\u003eThis wire is used in residential service entrances, commercial panel feeds, and industrial feeder applications where a large-gauge, high-ampacity conductor is required. The gray insulation color supports phase identification and color-coding practices on multi-conductor runs. Cut-to-length availability reduces waste on job sites where a full reel is not required. Typical applications include feeder runs from main distribution panels, motor circuit feeds, and large appliance branch circuits installed in metallic or non-metallic conduit.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e300 kcmil copper conductor with 37-strand construction for flexibility in conduit pulls\u003c\/li\u003e\n  \u003cli\u003e600-volt rating suitable for standard commercial and residential power distribution\u003c\/li\u003e\n  \u003cli\u003eAmpacity of 240 amps at 60 degrees C, 285 amps at 75 degrees C, and 320 amps at 90 degrees C\u003c\/li\u003e\n  \u003cli\u003e90 degrees C dry temperature rating for demanding installation environments\u003c\/li\u003e\n  \u003cli\u003eGray PVC insulation with nylon jacket for abrasion resistance and pull-through durability\u003c\/li\u003e\n  \u003cli\u003eCut-to-length format reduces material waste on custom feeder runs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use in conduit-enclosed wiring systems where THHN-rated 300 kcmil copper conductor is specified. Suitable for NEC-compliant feeder and branch-circuit installations in dry conduit environments rated for 600 volts or less.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation must be performed by a licensed electrician in accordance with applicable NEC articles and local electrical codes. De-energize and lock out the circuit or panel before making any connections. THHN wire must be installed inside an approved conduit or raceway — direct burial and wet locations require a wire type rated for those conditions. Use appropriately rated lugs, terminals, and connectors sized for 300 kcmil conductors.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConductor Material\u003c\/strong\u003e: Copper\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConductor Size\u003c\/strong\u003e: 300 kcmil\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStranding\u003c\/strong\u003e: 37 Strand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVoltage Rating\u003c\/strong\u003e: 600 volts\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAmpacity\u003c\/strong\u003e: 240 amps at 60 degrees C, 285 amps at 75 degrees C, 320 amps at 90 degrees C\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTemperature Rating\u003c\/strong\u003e: 90 degrees C (Dry)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsulation Material\u003c\/strong\u003e: PVC, Thermoplastic\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eJacket Material\u003c\/strong\u003e: Nylon\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsulation Color\u003c\/strong\u003e: Gray\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOuter Diameter\u003c\/strong\u003e: 0.747 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 1012 pounds per 1000 feet\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWire Type\u003c\/strong\u003e: THHN\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: THHNCU-GENERIC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: thhn300mcmstrgrymr\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"THHNCU-GENERIC","offers":[{"title":"Default Title","offer_id":51268392780082,"sku":"THHN300MCMSTRGRYMR","price":13890.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/308909034.jpg?v=1780703775","url":"https:\/\/voomisupply.com\/products\/thhncu-generic-thhn300mcmstrgrymr-thhn-300-kcmil-copper-wire","provider":"Voomi Supply","version":"1.0","type":"link"}