2023 Understanding the National Electrical Code Workbook (Art. 90-480)

Mike Holt's Understanding the National Electrical Code Workbook, Articles 90-480, Based on the 2023 NEC

Mike Holt's 2023 Understanding the National Electrical Code, Vol. 1 textbook (Art. 90-480)

2023 Understanding the National Electrical Code, Vol. 2 textbook (Art. 500-820)