{"product_id":"300-mcm-thhn-thwn-2-copper-building-wire","title":"300 MCM THHN\/THWN-2 Copper Building Wire | Stranded 600V","description":"\u003cp data-path-to-node=\"8\"\u003e\u003cb data-path-to-node=\"8\" data-index-in-node=\"16\"\u003e\"The heavy-duty choice for high-amperage industrial power—engineered with dual-rated THHN\/THWN-2 insulation and a friction-reducing nylon jacket for maximum reliability in 600V applications.\"\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"9\"\u003e\u003cb data-path-to-node=\"9\" data-index-in-node=\"0\"\u003eWhy Electricians Choose 300 MCM THHN\/THWN-2 Copper\u003c\/b\u003e The 300 MCM copper building wire is a high-capacity conductor designed for major power distribution. It is the primary choice for 300-amp commercial services, large-scale HVAC systems, and industrial switchgear. The stranded construction is essential at this massive size, providing the flexibility required to \"train\" the wire into large enclosures and land it securely in high-torque mechanical lugs.\u003c\/p\u003e\n\u003cul data-path-to-node=\"13\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"13,0,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"13,0,0\"\u003eDual Rated (THHN\/THWN-2):\u003c\/b\u003e Engineered for dry locations up to 90°C (THHN) and wet locations (THWN-2), providing maximum versatility for indoor and outdoor conduits.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"13,1,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"13,1,0\"\u003eTough PVC\/Nylon Jacket:\u003c\/b\u003e The high-heat and moisture-resistant PVC insulation is protected by a tough, friction-reducing Nylon outer sheath, making for easier pulls through tight bends.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"13,2,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"13,2,0\"\u003eHigh-Conductivity Copper:\u003c\/b\u003e Manufactured with soft-annealed stranded copper to provide maximum flexibility and superior electrical conductivity for branch circuits and feeders.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"13,3,0\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"13,3,0\"\u003eOil \u0026amp; Gasoline Resistant:\u003c\/b\u003e The specialized jacket is designed to resist chemical degradation, making it ideal for industrial environments and service station wiring.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4 data-path-to-node=\"12\"\u003eCommon 300 MCM THHN\/THWN-2 Applications\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,0,0\"\u003e\u003cstrong\u003eCommercial \u0026amp; Industrial Feeders: \u003c\/strong\u003eSupplying power from main service panels to subpanels, distribution boards, and large machinery.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,1,0\"\u003e\u003cb data-path-to-node=\"4,1,0\" data-index-in-node=\"0\"\u003eIndustrial Motor Supplies:\u003c\/b\u003e Ideal for powering mid-to-large sized 3-phase industrial motors and heavy manufacturing equipment.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,2,0\"\u003e\u003cb data-path-to-node=\"4,2,0\" data-index-in-node=\"0\"\u003eCommercial Building Mains:\u003c\/b\u003e Used to distribute power from the main service entrance to large distribution panels in retail and office spaces.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,3,0\"\u003e\u003cb data-path-to-node=\"4,3,0\" data-index-in-node=\"0\"\u003eUPS \u0026amp; Battery Systems:\u003c\/b\u003e Providing the high-conductivity backbone for large uninterruptible power supplies in data centers.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,4,0\"\u003e\u003cb data-path-to-node=\"4,4,0\" data-index-in-node=\"0\"\u003eParallel Power Sets:\u003c\/b\u003e Frequently run in sets of two or three per phase to handle 600A to 800A commercial services.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-path-to-node=\"14\"\u003e\n\u003ch4 data-path-to-node=\"15\"\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cp data-path-to-node=\"16\"\u003e\u003cb data-path-to-node=\"16\" data-index-in-node=\"0\"\u003eENGINEERING OVERVIEW: 300 MCM STR THHN 600V\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"17\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,0,0\"\u003e\u003cb data-path-to-node=\"17,0,0\" data-index-in-node=\"0\"\u003eAPPLICATION:\u003c\/b\u003e Feeder wire for sub-panels, large appliances, and industrial power distribution.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,1,0\"\u003e\u003cb data-path-to-node=\"17,1,0\" data-index-in-node=\"0\"\u003eVOLTAGE:\u003c\/b\u003e Rated for 600 Volts.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,2,0\"\u003e\u003cb data-path-to-node=\"17,2,0\" data-index-in-node=\"0\"\u003eCONDUCTORS:\u003c\/b\u003e Stranded soft-annealed copper.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,3,0\"\u003e\u003cb data-path-to-node=\"17,3,0\" data-index-in-node=\"0\"\u003eINSULATION:\u003c\/b\u003e Heat and moisture-resistant PVC (Polyvinyl Chloride).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,4,0\"\u003e\u003cb data-path-to-node=\"17,4,0\" data-index-in-node=\"0\"\u003eJACKET:\u003c\/b\u003e Tough, abrasion-resistant Nylon.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,5,0\"\u003e\u003cb data-path-to-node=\"17,5,0\" data-index-in-node=\"0\"\u003eTEMPERATURE:\u003c\/b\u003e 90°C Dry (THHN), 90°C Wet (THWN-2).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,5,0\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cb data-path-to-node=\"17,5,0\" data-index-in-node=\"0\"\u003eAmpacity:\u003c\/b\u003e  285\u003cspan\u003e amps at 75°C | 320 amps at 90°C \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"22\"\u003e \u003c\/p\u003e\n\u003chr data-path-to-node=\"23\"\u003e\n\u003cp data-path-to-node=\"24\"\u003e\u003cb data-path-to-node=\"24\" data-index-in-node=\"0\"\u003eTechnical Note:\u003c\/b\u003e All values are nominal and subject to industry tolerances and manufacturer corrections. Specifications are subject to change without notice. It is the buyer’s responsibility to verify that all materials meet the specific requirements of the project and comply with local electrical codes.\u003c\/p\u003e\n\u003cp data-path-to-node=\"24\"\u003e \u003c\/p\u003e","brand":"Wire America","offers":[{"title":"Black \/ 250 ft. Spool","offer_id":53318554517818,"sku":"THN300CST-250-BK","price":3074.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ 500 ft. Spool","offer_id":53318554550586,"sku":"THN300CST-500-BK","price":6116.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ 1000 ft. Spool","offer_id":53318554583354,"sku":"THN300CST-1K-BK","price":12168.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ 2500 ft. 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