What size conduit for 150amp?

For a 150 amp service, you typically use a conduit size of 2 inches for copper conductors or 2.5 inches for aluminum conductors, depending on the number of conductors and the type of insulation. It's essential to check the National Electrical Code (NEC) tables for specific installations, as conduit fill requirements can vary based on the number of wires and their size. Always ensure to verify with local codes and regulations for compliance.