What wire size to use for 600A DC?

For a 600A DC application, a wire size of 3/0 AWG (American Wire Gauge) is typically recommended for copper conductors, while aluminum conductors may require a larger size, such as 250 kcmil. It's important to consider factors like the length of the run, ambient temperature, and installation conditions, as these can affect the wire's ampacity. Always consult the National Electrical Code (NEC) and local regulations for specific requirements and recommendations.