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The wire size chart below shows 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 air temperature of 30°C (86°F). Search Amazon for your Electrical ...
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Select wire size: Select conductor type: Choose maximum...
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Note: These values are based on allowable ampacities of...
- Wire Ampacity Calculator
Wire Ampacity Calculator Enter the information below to...
- Maximum Allowable Ampacities for Conductors in Raceway, Cable Or Earth (40 C)
The ampacity chart below shows allowable ampacities of...
- Tables
List of Wire Size Tables. Table Description; Maximum...
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Note: K = 12.9 for Copper conductors at 75°C (167°F), and K...
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Ampacity is the maximum current that a conductor can carry continuously under the conditions of use without exceeding its temperature rating. Cerrowire's ampacity chart helps calculate the load requirement for a circuit.
Ampacity-wise, the 4/0 AWG gauge wire can handle the largest amount of current of any AWG gauge wire. At 75°C, the 4/0 copper wire ampacity is 230 amp (with 195 amps and 260 amps at 60°C and 90°C temperature, respectively). You can consult the electrical wire size chart above to find all this data.
In the list of standard sizes as integers, 4/0 (0000) is the largest diameter and 40AWG is the smallest diameter printed on AWG. In addition, there are some special gauges such as 0000 (4/0), 000 (3/0), 00 (2/0) used for wire diameter and thickness larger than 0AWG.
Type of metal wire is made out of (copper or aluminum). As we will see in the NEC ampacity chart, copper wires can handle more amps than same-size aluminum wires. That’s because copper has a lower resistivity (1.72 × 10 -8 Ohm×m at 68°F) than aluminum (2.65 × 10 -8 Ohm×m at 68°F).
NEC provides tables for adjusting allowable ampacities when the ambient temperature deviates from an expected range for the temp rating of the conductor, as well as for number of conductors in raceways or cable trays, when part of the wire is exposed to sun or wind, etc.
Copper Wire Ampacity Table. Ampacities of copper wire, in free air at 30o C: * = estimated values; normally, wire gages this small are not manufactured with these insulation types.
