- Power and distribution transformers (1)
- Autotransformers, electric (power transformers) (4)
- Current limiting reactors, electrical (1)
- Distribution transformers, electric (3)
- Generator voltage regulators (1)
- Line voltage regulators (4)
- Power transformers, electric (8)
- Transmission and distribution voltage regulators (3)
- Voltage regulating transformers, electric power (3)
- Voltage regulators, transmission and distribution (4)
- Fluorescent ballasts (1)
- Specialty transformers (3)
- Doorbell transformers, electric (1)
- Lighting transformers, fluorescent (1)
- Luminous tube transformers (1)
- Instrument transformers (except portable) (2)
- Vibrators, interrupter (2)
