| Includes | switchgear and circuit protection devices for Extra-high voltage utility applications. Extra-high voltage: 345 kV to 765 kV. |
| Alternate Terms/Abbreviations | circuit breakers: disconnect switches. Gas-filled circuit breakers: SF6 circuit breakers. |
| See | 33 72 00 for utility substations. 33 73 00 for utility transformers. 33 75 00 for high-voltage switchgear and protection devices. 33 77 00 for medium-voltage utility switchgear and protection devices. 33 79 23 for utility substation grounding. 34 21 19 for traction power switchgear. |