Nec wire size chart. Mcp breakers for motors 125 or next larger size standard breaker sizes are listed page 70 74 240 6 nec conduit sizing 1. The smallest awg size is 40 and the largest is 0000 40. This wire size calculator will calculate the appropriate wire gauge for a circuit based on amps voltage distance and load. The larger the awg number or wire guage the smaller the physical size of the wire.
Ampacities of insulated conductors from nec table nec31015b16 not more than three conductors in raceway or cable or earth directly buried based on ambient temperature of 300 c 860 f. Ampacities are based on the 2017 nec and do not reflect any temperature correction or ampacity adjustments that may be required. American wire gauge awg is a standardized wire gauge system for the diameters of round solid nonferrous electrically conducting wire. For copper wiring the following wire sizes and ampacity ratings or fusecircuit breaker sizes are common on 120v residential electrical circuits.
After circuits have been derated to get proper wire size use table 3a if wires are all. Nec 21019 conductors minimum ampacity and size a branch circuit not more than 600 volts. The requirements of the national electrical code nec and local codes must always be followed. American wire gauge conductor size table american wire gauge awg is a standardized wire gauge system for the diameters of round solid nonferrous electrically conducting wire.
The tables and notes below expand and provide detail about the ampacity and temperature ratings of various wire sizes and gives a brief history of us. American wire gauge conductor size table. For safe wiring practices consult the national electrical code your local building inspector or a qualified electrician. Nec wire sizing table changes.
This website provides a wire size calculator voltage drop calculator wire ampacity charts and more. The smallest awg size is 40 and the largest is 0000 40.