33 72 53
Shunt Reactors
33 72 43
Substation Control Wiring
33 72 33.43
Substation DC Supply
33 72 33.26
Substation Metering
33 72 33.23
Power-Line Carriers
33 72 33.16
Substation Control Panels
33 72 33.13
Relays
33 72 33
Control House Equipment
33 72 26.16
Copper Substation Bus Assemblies
33 72 26.13
Aluminum Substation Bus Assemblies
33 72 26
Substation Bus Assemblies
33 72 23.13
Bus Support Insulators
33 72 23
Structural Bus Supports
33 72 13
Deadend Structures
33 72 00
Utility Substations
33 71 83
Transmission and Distribution Specialties
33 71 73
Electrical Utility Services
33 71 53
Direct-Current Transmission
33 71 49.33
Underwater Medium-Voltage Transmission Wiring
33 71 49.23
Underground Medium-Voltage Transmission Wiring