#Wire ampacity chart code#
Note: View additional wire size charts from the list below. These ampacities are approximate and must be modified for the environment - number of current carrying conductors in the raceway, ambient temperature, etc. Various tables and charts indicate conductor ampacity, temperature correction factors, and adjustment factors in NFPA 70 ®, National Electrical Code ® (NEC ®).This free download includes Tables 310.15(B)(1), 310.15(C)(1), and 310. Wire Size Chart and Maximum Amp Ratings Source: NFPA 70, National Electrical Code, Table 310.15(B)(16) SIZE The wire size chart below shows allowable ampacities of insulated conductors rated up to and includingĢ000 Volts, 60☌ through 90☌ (140☏ through 194☏), not more than three current-carryingĬonductors in raceway, cable, or earth (directly buried), based on ambient air temperature of 30☌ (86☏). The number of devices connected to the circuit usually determines how much current will flow through the wire. It is important to pick the correct size of wire so that the wire doesn't overheat. Limit that a wire can handle before damage occurs. Each wire size, or wire gauge (AWG), has a maximum current Copper Tube Joints Working Pressure Solder or Brazing Joints Based on ASME Standard B31.Electrical current is measured in amps.Chemical Finish Black Oxide for Copper, Mil-F-495.Smaller bare conductor diameters than those shown.Īmerican Wire Gauge (AWG) Wire Size Chart Conductors with compact and compressed stranding have about 9 percent and 3 percent, respectively, Using conductors having coated strands, different stranding type, and, especially, other temperatures changes the resistance.ģ. CONDUCTORS: Aluminum alloy 1350-H119 wires, concentrically stranded around a steel core available with Class A, B or C galvanizing aluminum coated (AZ) or aluminum-clad steel core (AL). These resistance values are valid only for the parameters as given. Staff of Research and Education Associationġ. Reference: Handbook of Scientific and Engineering Data Cross-sectional area for busbars is typically rated in terms of circular mils (even for square and rectangular bars!), most likely for the convenience of being able to directly equate busbar size with round wire. Although a square or rectangular cross-section is very common for busbar shape, other shapes are used as well. Busbars are usually made of copper or aluminum, and are most often uninsulated. In these instances, thick bars of solid metal called busbars are used as conductors. Stranded wire construction is favored, instead.įor some high-current applications, conductor sizes beyond the practical size limit of round wire are required.
This is a handy rule to remember when making rough wire size estimations!įor very large wire sizes (fatter than 4/0), the wire gauge system is typically abandoned for cross-sectional area measurement in thousands of circular mils (MCM), borrowing the old Roman numeral "M" to denote a multiple of "thousand" in front of "CM" for "circular mils." The following table of wire sizes does not show any sizes bigger than 4/0 gauge, because solid copper wire becomes impractical to handle at those sizes. The American Wire Gauge (AWG) measurement system was designed with a purpose: for every three steps in the gauge scale, wire area (and weight per unit length) approximately doubles. Instrumentation, Electrical, Control and Sensing DevicesĪWG Copper Wire Table Size and Data Chart 100 Degrees F
AWG Copper Wire Size and Data Table Chart 100 Degrees F
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