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Wire diameter calculations. The n gauge wire diameter d n in inches (in) is equal to 0.005in times 92 raised to the power of 36 minus gauge number n, divided by 39: dn (in) = 0.005 in × 92 (36-n)/39. The n gauge wire diameter d n in millimeters (mm) is equal to 0.127mm times 92 raised to the power of 36 minus gauge number n, divided by 39:
Calculate Your Voltage Drop. Determines wire size to meet specific voltage drop limits or calculates voltage drop for a specific conductor run. When sizing conductors, calculations limits wire size to voltage drop and NEC ampacity. Southwire's Voltage Drop Calculator is designed for applications using AWG and KCMIL sizes only.
Circuit Distance Calculator. Calculates maximum length of conductor run, voltage drop, and voltage at load based on voltage, phases, amps, wire size, conductor and maximum percentage drop. Motor Wire Size Calculator. Calculates the full-load amps, wire size, breaker size, heater size, starter size and conduit size for a given motor HP and voltage.
The ampacity used to calculate the wire size is referred to the minimum circuit ampacity (MCA) after applying a voltage drop calculation to it. In the CEC and the NEC the MCA = 1.25 * FLA, where the FLA should be obtained from the nameplate or the manufacturer. If not, you can refer to Tables 44 and 45 of the CEC, or 430-148 and 430-150 of the ...
Wire Size Calculator. Enter the information below to calculate the appropriate wire size. Voltage - Enter the voltage at the source of the circuit. Single-phase voltages are usually 115V or 120V, while three-phase voltages are typically 208V, 230V or 480V. Amperes - Enter the maximum current in amps that will flow through the circuit.
To use the calculator, enter the Maximum Current in Amps of the circuit, and the Length of the Wire, and operating Voltage. Typically most automotive systems run at 13.8V, but you can select 6, 12, 13.8 (Default) or 24 volts. If the wire gauge is OK to use it will have a 'Check Mark' on the same line.
