- Power and distribution transformers (6)
- Control transformers (2)
- Feeder voltage boosters (electric transformers) (1)
- Line voltage regulators (1)
- Power transformers, electric (7)
- Transmission and distribution voltage regulators (2)
- Voltage regulating transformers, electric power (2)
- Ballasts for lighting fixtures (1)
- Fluorescent ballasts (1)
- Specialty transformers (7)
- Electronic meter transformers (1)
- Lighting transformers, street and airport (1)
