![]() ![]() Note: View additional wire size charts from the list below. 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. An approximation for the resistance of copper wire may be expressed as follows: Approximate resistance of. It is important to pick the correct size of wire so that the wire doesn't overheat. A solid round 18 AWG wire is about 1 mm in diameter. Limit that a wire can handle before damage occurs. Each wire size, or wire gauge (AWG), has a maximum current ![]()
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