33 70 00
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Electrical Utilities
Includes substations, transformers, switchgear, circuit protection devices, utility structures, and wiring to distribute high- and medium-voltage electrical power from the point of power generation to the service points of facilities.

33 70 00 Electrical Utilities
33 71 00 Electrical Utility Transmission and Distribution
33 72 00 Utility Substations
33 73 00 Utility Transformers
33 75 00 High-Voltage Switchgear and Protection Devices
33 77 00 Medium-Voltage Utility Switchgear and Protection Devices
33 79 00 Site Grounding