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33 70 00 Electrical Utilities
33 70 00 Electrical Utilities
  • 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

33 70 00 Electrical Utilities