Wire Diameter Chart Nec

By | September 17, 2023

Wire Diameter Chart NEC

The National Electrical Code (NEC) is a set of standards that governs the installation of electrical wiring and equipment in the United States. The NEC specifies the minimum wire size that must be used for a given application, based on the current carrying capacity of the wire and the ambient temperature. The NEC wire size chart is a table that lists the minimum wire size for a variety of applications, including: * General purpose wiring * Lighting circuits * Motor circuits * Appliance circuits * Service entrance conductors The wire size chart is based on the following factors: * The type of insulation on the wire * The ambient temperature * The maximum allowable voltage drop The type of insulation on the wire is important because it affects the current carrying capacity of the wire. For example, a wire with a rubber insulation has a lower current carrying capacity than a wire with a PVC insulation. The ambient temperature is also important because it affects the current carrying capacity of the wire. As the ambient temperature increases, the current carrying capacity of the wire decreases. The maximum allowable voltage drop is the maximum amount of voltage that can be lost between the source of power and the load. The voltage drop is caused by the resistance of the wire. The longer the wire, the greater the voltage drop. The NEC wire size chart is a valuable tool for electricians and other electrical professionals. It can be used to determine the minimum wire size for a given application, ensuring that the electrical system is safe and reliable. ### How to Use the NEC Wire Size Chart The NEC wire size chart is easy to use. Simply find the application that you are working on and the ambient temperature. Then, look up the corresponding wire size. For example, if you are working on a general purpose wiring application in a temperature of 86 degrees Fahrenheit, you would use a 12 AWG wire. Here is a step-by-step guide on how to use the NEC wire size chart: 1. Find the application that you are working on. 2. Find the ambient temperature. 3. Look up the corresponding wire size. ### Example of Using the NEC Wire Size Chart Let's say that you are working on a general purpose wiring application in a temperature of 86 degrees Fahrenheit. You would use a 12 AWG wire. Here is the table that you would use: | Application | Ambient Temperature | Wire Size | |-------------|-------------------|---------| | General Purpose | 86°F | 12 AWG | | Lighting Circuits | 86°F | 14 AWG | | Motor Circuits | 86°F | 10 AWG | | Appliance Circuits | 86°F | 12 AWG | | Service Entrance Conductors | 86°F | 2 AWG | ### Conclusion The NEC wire size chart is a valuable tool for electricians and other electrical professionals. It can be used to determine the minimum wire size for a given application, ensuring that the electrical system is safe and reliable.


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