| CSI Code | Short Description | Extended Description |
| 16300 | Transmission and Distribution |
| 16310 | Transmission and Distribution Accessories | Arresters Cutouts Insulators Line Materials Supports |
| 16320 | High-Voltage Switching and Protection | High - Voltage Circuit Breakers High - Voltage Cutouts High - Voltage Fuses High - Voltage Lightning Arresters High - Voltage Reclosers High - Voltage Surge Arresters |
| 16330 | Medium-Voltage Switching and Protection | Medium - Voltage Circuit Protection Devices Medium - Voltage Cutouts Medium - Voltage Fuses Medium - Voltage Lightning Arresters Medium - Voltage Reclosers Medium - Voltage Surge Arresters |
| 16340 | Medium-Voltage Switching and Protection Assemblies | Medium - Voltage Circuit Breaker Switchgear Medium - Voltage Enclosed Bus Medium - Voltage Enclosed Fuse Cutouts Medium - Voltage Enclosed Fuses Medium - Voltage Fusible Interrupter Switchgear Medium - Voltage Motor Controllers Medium - Voltage Vacuum Interrupter Switchgear |
| 16360 | Unit Substation |