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33 71 00
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33 71 13
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33 71 16
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33 71 19
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33 71 23
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33 71 26
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33 71 36
Extra-High-Voltage Transmission Wiring
33 71 39
High-Voltage Transmission Wiring
33 71 49
Medium-Voltage Transmission Wiring
33 71 53
Direct-Current Transmission
33 71 73
Electrical Utility Services
33 71 83
Transmission and Distribution Specialties
33 72 00
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33 73 00
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33 74 00
Extra High Voltage (EHV) Switchgear and protection devices
33 75 00
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33 77 00
Medium-Voltage Utility Switchgear and Protection Devices
33 78 00
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Site Grounding
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Electrical Power Generation
Divisions >
33 00 00 Utilities >
33 70 00 Electrical Utilities >
33 71 00 Electrical Utility Transmission and Distribution >
33 71 49
Medium-Voltage Transmission Wiring
33 71 49.13
Overhead Medium-Voltage Transmission Wiring
33 71 49.23
Underground Medium-Voltage Transmission Wiring
33 71 49.33
Underwater Medium-Voltage Transmission Wiring