How many amps is 400 kcmil good for?

The ampacity of a 400 kcmil (thousand circular mils) conductor depends on factors such as the conductor material (copper or aluminum), insulation type, and installation conditions. For example, a 400 kcmil copper conductor can typically carry around 400 to 600 amps at standard temperature ratings in open air or conduit, while an aluminum conductor of the same size may carry slightly less. Always refer to the National Electrical Code (NEC) and local codes for precise applications and ampacity tables.