| CSI Code | Short Description | Extended Description |
| 16400 | Low-Voltage Distribution |
| 16410 | Enclosed Switches and Circuit Breaker |
| 16420 | Enclosed Controller |
| 16430 | Low-Voltage Switchgear |
| 16440 | Switchboards, Panelboards and Control Centers |
| 16450 | Enclosed Bus Assemblies |
| 16460 | Low-Voltage Transformer |
| 16470 | Power Distribution Units |
| 16490 | Low-Voltage Distribution Components and Accessories |