However, the cross-sectional area of a conductor can also be changed to alter theĬonductor's resistance. The length of a conductor is directly proportional to its resistance. The heating of a conductor can be directly attributed from its Wire ampacity is calculated in such a way as to not exceed a certain temperature rise at a particular electrical load. However, many different external factors such as ambient temperature and conductor insulation play a part in determining In order to properly size a wire for your application, the ampacity ratings for a wire must be understood. The ampacity rating of a wire determines the amperage that a wire can safely Amperage is the measure of electricalĬurrent flowing through a circuit. Wire for many different applications can become complex and overwhelming.
Wire to prevent overheating, fire and other dangerous conditions.
#Logicworks 5 drawing wires code
The National Electrical Code provides requirements for sizing electrical Source: NFPA 70, National Electrical Code, Table 310.15(B)(16-17) Conductor Sizing Always use the total length of the circuit for calculations.Ĭonsult with an engineer if your application requires more complex calculations. Note: It's recommended to check the ampacity of a wire after doing a voltage drop calculation. It is recommended not to exceed a voltageĭistance - Enter the one-way length of the wires in the circuit in feet. Voltage Drop - Choose the maximum percentage of the source voltage drop. In a cable, burried in the Earth, or in open air. This is typically in a raceway (cable-tray or conduit), Installation - Choose the installation method for the circuit. Common conductors are copper and aluminum. Insulation - Select the thermal rating of the insulation on the wire.Ĭonductor - Choose the material used as a conductor in the wire. To calculate ground wire size, use the Ground Wire Size Calculator. For three-phase circuits, four wires are required. Single-phase circuits, three wires are required. This is typically single-phase or three-phase. Phases - Select the number of phases in the circuit. To multiply the nameplate FLA by 1.25 for wire sizing. While three-phase voltages are typically 208V, 230V or 480V.Īmperes - Enter the maximum current in amps that will flow through the circuit. Single-phase voltages are usually 115V or 120V, Voltage - Enter the voltage at the source of the circuit.
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