- Autotransformers, electric (power transformers) (3)
- Control transformers (3)
- Current limiting reactors, electrical (1)
- Distribution transformers, electric (17)
- Feeder voltage boosters (electric transformers) (3)
- Feeder voltage regulators (electric transformers) (3)
- Generator voltage regulators (4)
- Power transformers, electric (37)
- Transmission and distribution voltage regulators (4)
- Voltage regulating transformers, electric power (5)
- Voltage regulators, transmission and distribution (3)
- Ballasts for lighting fixtures (9)
- Fluorescent ballasts (2)
- Specialty transformers (12)
- Autotransformers for switchboards (exc. tele. switchboards) (1)
- Electric furnace transformers (1)
- Electronic meter transformers (2)
- Fluorescent lighting transformers (1)
- Lighting transformers, fluorescent (1)
- Lighting transformers, street and airport (3)
- Machine tool transformers (2)
- Reactor transformers (3)
- Rectifier transformers (3)
- Signaling transformers, electric (1)
- Instrument transformers (except portable) (2)
