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- 33 71 00 Electrical Utility Transmission and Distribution
- 33 72 00 Utility Substations
- 33 73 00 Utility Transformers
- 33 74 00 Extra High Voltage (EHV) Switchgear and protection devices
- 33 75 00 High-Voltage Switchgear and Protection Devices
- 33 77 00 Medium-Voltage Utility Switchgear and Protection Devices
- 33 78 00 Substation Converter Stations
- 33 79 00 Site Grounding
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