- 13440 - Indicators, Recorders, And Controllers
- 16070 - Hangers and Supports
- 16270 - Transformers
- 16300 - Transmission and Distribution
- 16330 - Medium-Voltage Switching and Protection
- 16400 - Low-Voltage Distribution
- 16420 - Enclosed Controllers
- 16430 - Low-Voltage Switchgear
- 16440 - Switchboards, Panelboards, and Control Cen
- 16470 - Power Distribution Units
- 16490 - Components and Accessories
- 16700 - Communications
- 16800 - Sound and Video
- 26 05 29 - Hangers and Supports for Electrical Systems
- 26 05 48 - Vibration and Seismic Controls for Electrical Systems
- 26 10 00 - MEDIUM-VOLTAGE ELECTRICAL DISTRIBUTION
- 26 12 00 - Medium-Voltage Transformers
- 26 13 00 - Medium-Voltage Switchgear
- 26 18 00 - Medium-Voltage Circuit Protection Devices
- 26 18 13 - Medium-Voltage Cutouts
- 26 18 16 - Medium-Voltage Fuses
- 26 18 19 - Medium-Voltage Lightning Arresters
- 26 18 23 - Medium-Voltage Surge Arresters
- 26 18 26 - Medium-Voltage Reclosers
- 26 20 00 - LOW-VOLTAGE ELECTRICAL TRANSMISSION
- 26 22 00 - Low-Voltage Transformers
- 26 22 13 - Low-Voltage Distribution Transformers
- 26 23 00 - Low-Voltage Switchgear
- 26 24 00 - Switchboards and Panelboards
- 26 26 00 - Power Distribution Units
- 26 27 00 - Low-Voltage Distribution Equipment
- 26 29 13 - Enclosed Controllers
- 27 00 00 - COMMUNICATIONS
- 27 40 00 - AUDIO-VIDEO COMMUNICATIONS
- 33 71 00 - Electrical Utility Transmission and Distribution
- 33 73 00 - Utility Transformers
- 33 77 00 - Medium-Voltage Utility Switchgear and Protection Devices
- 33 77 33 - Medium-Voltage Utility Cutouts
- 33 77 36 - Medium-Voltage Utility Fuses
- 33 77 39 - Medium-Voltage Utility Surge Arresters
- 33 77 53 - Medium-Voltage Utility Reclosers
- 40 91 00 - Primary Process Measurement Devices
- 40 93 13 - Analog Controllers
- 40 93 23 - Chart Recorders
- 40 94 00 - Digital Process Controllers
- 40 97 00 - Process Control Auxiliary Devices
- 40 97 10 - Process Control Annunciators