Power, Distribution, & Specialty Transformer Manufacturing
Key Figures
Figures are published for NAICS 335311 directly.
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Official definition
This U.S. industry comprises establishments primarily engaged in manufacturing power, distribution, and specialty transformers (except electronic components). Industrial-type and consumer-type transformers in this industry vary (e.g., step up or step down) voltage but do not convert alternating to direct or direct to alternating current.
Source: US Census Bureau, 2017 NAICS Definitions. Public domain.
Illustrative examples
- Distribution transformers, electric, manufacturing
- Fluorescent ballasts (i.e., transformers) manufacturing
- Substation transformers, electric power distribution, manufacturing
- Transmission and distribution voltage regulators manufacturing
Which code does this activity belong in?
Code 335311 covers establishments manufacturing transformers that change voltage levels without converting between alternating and direct current; this distinguishes them from motor and generator manufacturers in 335312, which produce equipment that converts between electrical current types. Transformer manufacturers differ from switchgear and switchboard apparatus manufacturers classified in 335313, which make switching and protection equipment like circuit breakers and fuses rather than voltage conversion devices. Code 335311 also excludes relay and industrial control manufacturers in 335314, whose products regulate motor operation and control systems rather than transform voltage levels.