From tables provided in this chapter, identify the ampacity of the following conductors:
a. No. 4/0 AWG aluminum conductor with THHN insulation and a temperature rating of 60°C/140°F
b. No. 4/0 AWG aluminum conductor with THHN insulation and a temperature rating of 75°C/167°F
c. No. 4/0 AWG aluminum conductor with THHN insulation and a temperature rating of 90°C/194°F

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TABLE 18.16 PROPERTIES OF COPPER AND ALUMINUM CONDUCTORS IN AC (ARMORED) CABLE THAT IS SUITABLE FOR USE IN BRANCH CIRCUITS AND FEEDERS IN BOTH EXPOSED AND CONCEALED WORK IN COMMERCIAL, INDUSTRIAL, INSTITUTIONAL, AND MULTIRESIDENTIAL APPLICATIONS WHERE IT IS NOT SUBJECT TO PHYSICAL DAMAGE. COMPILED FROM NUMEROUS INDUSTRY SOURCES. Conductor Size Number of Ungrounded and Neutral AC Cable with Type THHN/THWN Copper Conductors Aluminum (AWG or kcmil) 14 12 10 Conductors 234234234 Nominal Ampacity Bonding Conductor Size Outside Diameter Approx. Net Weight per 1000 ft 60C 75C 90C (AWG) (mils) (lb) 140F 167F 194F 16 0.464 84 16 0.485 104 16 0.517 124 16 0.498 105 16 0.521 133 16 0.557 162 16 0.560 142 16 0.588 184 16 0.632 229 888 888 15 15 15 30 05222888 15 15 20 30 30 555222388 15 15 20 20 30 30 30