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The following chart is a guideline of “ampacity”, or copper wire current-carrying capacity following the Handbook of Electronic Tables and Formulas for American Wire Gauge. As you might guess, the rated “ampacities” are just a rule of thumb.
This Handbook is a revision of the Copper Wire Tables previously published as NBS Circular 31. It reflects changes in the nominal diameters of gages 45 and smaller and extends the tables to 56 gage. The changed diameters and extended range were established in 1961 by the Committee on Wires for Electrical Conductors of the American
30 amperes for 10 AWG copper; or 15 amperes for 12 AWG and 25 amoeres for 10 AWG aluminum after any correction. factors Tor ambient temperature and number of conductors have been applied.
CURRENT CAPACITY CHART OF COPPER CONDUCTORS Current carrying capacity is defined as the amperage a conductor can carry before melting either the conductor or the insulation. Heat, caused by an electrical current flowing through the conductor, will determine the amount of current a wire will handle.
Maximum Current: These ampacities are based on a very moderate rating of 700 circular mils per amp (cma). Determining a more accurate current rating depends on a variety of factors including the surrounding materials, permissible temperature rise, and specific usage of the wire.
Wire Size & Amp Ratings • Ampacity is the maximum current that a conductor can carry continuously under the conditions of use without exceeding its temperature rating. Current is measured in amperes or “amps.” You must use the correct size wire for the current (load) requirement of the circuit to prevent the wire from overheating.
Information from many sources has been compiled in this booklet for your convenience. The information in Section 1provides general conductor data.
