MCM sizing starts at 250 kcmil - slightly larger than 4/0 wire. Outside Diameter: 20.752 mm / 0.817 inchesĪllowable Ampacity: 260 Amps at 60✬ / 310 Amps at 75✬ / 350 Amps at 90✬ Start Various tables and charts indicate conductor ampacity, temperature correction factors, and adjustment factors in NFPA 70®, National Electrical Code® (NEC®). If a wire is larger than 4/0, it is measured in MCM (thousands of circular mils). Nylon Jacket Thickness: 0.200 mm / 0.008 inches PVC Insulation Thickness (Conductor): 1.520 mm / 0.060 inches Stranded, uncoated copper conductors per ASTM-B3, ASTM-B787 and ASTM-B8Ĭolor-coded Polyvinyl Chloride (PVC), heat and moisture-resistant, flame-retardant compound per UL-1063 and UL-8 Institute of Electrical and Electronics Engineers All sizes are rated gasoline and oil-resistant II.Ī tough, polyamide, Nylon outer covering per UL-1063 and UL-83. Applications requiring Type MTW conductor is appropriate for use in dry locations at 90☌, or not to exceed 60☌ in wet locations or where exposed to oils or coolants. Note: View additional wire size charts from the list below. Applications requiring Type THHN or THWN-2, the conductor is appropriate for use in wet or dry locations at temperatures not to exceed 90☌ or not to exceed 75☌ in oil or coolants. There is an additional de-rating adjustment factor that needs to be taken into account for selecting the correct wire size.
#Mcm wire size chart code
Type THHN/THWN-2 building wire is intended for general purpose applications as defined by the National Electrical Code (NEC). Type THHN-THWN-2 is permitted for new construction or rewiring for 600-volt applications. Enter the desired footage in the QTY box.
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