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National Electrical Code Allowable Ampacities of Insulated Conductors Rated 0-2000 Volts. As Excerpted from the 2002 National Electrical Code. Ampacities of Not More Than Three Current-Carrying Conductors in Raceway, Cable or Earth. Based on Ampbient Temperature of 30°C (86°F)
1st NEC 210.16 table includes copper wire ampacities from 18 AWG to 2000 kcmil for all 3 temperatures. 2nd NEC 210.16 table includes aluminum wire (or copper-clad aluminum wire) ampacities from 18 AWG to 2000 kcmil for all 3 temperatures. Here is the 1st chart, followed by the 2nd chart.
Wire Size Chart. Electrical current is measured in amps. Each wire size, or wire gauge (AWG), has a maximum current limit that a wire can handle before damage occurs. It is important to pick the correct size of wire so that the wire doesn't overheat.
Conductor Ampacity Based on the 2017 National Electrical Code ®. Single-Phase Dwelling Services and Feeders. NEC 210.19 Conductors–Minimum Ampacity and Size. Correction and Adjustment Factors—See NEC Tables 310.15 (B) (2) (a) and 310.15 (B) (3) (a) NEC Information of Note.
Table 310.15(B)(16) (formerly Table 310.16) Allowable Ampacities of Insulated Conductors Rated Up to and Including 2000 Volts, 60°C Through 90°C (140°F Through 194°F), Not More Than Three Current-Carrying Conductors in Raceway, Cable, or Earth (Directly Buried), Based on Ambient Temperature of 30°C (86°F)*.
This site offers many simple-to-use calculators and wire ampacity charts to aide you in properly sizing wire and conduit in compliance with the NEC. Visit the Calculators and Tables pages for a complete list of resources.
NEC 310-16 Allowable Ampacities of Insulated Conductors. Article 310 – Conductors for General Wiring. B. Table 310.16 Allowable Ampacities of Insulated Conductors Rated 0 Through 2000 Volts, 60°C Through 90°C (140°F Through 194°F), Not More Than Three Current-Carrying Conductors in Raceway, Cable, or Earth (Directly Buried), Based on ...
