2022 NAICS national industry in sector 31-33 Manufacturing
335311 Power, Distribution, and Specialty Transformer Manufacturing
NAICS 335311 is the US industry code for power, distribution, and specialty transformer manufacturing. This U.S.
- Code
- 335311 (2022 NAICS)
- Title
- Power, Distribution, and Specialty Transformer Manufacturing
- Part of
- Electrical Equipment Manufacturing
- SBA small business limit
- Up to 800 employees
- Closest UK SIC
- 27110, 27120 (details)
Changes coming. The NAICS 2027 revision applies to data from 1 January 2027, and SBA proposed new size standards on 20 August 2026. The values on this page are the ones in force today; we update this page when the official files change.
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.
Examples Census gives
- Fluorescent ballasts (i.e., transformers) manufacturing
- Substation transformers, electric power distribution, manufacturing
- Distribution transformers, electric, manufacturing
- Transmission and distribution voltage regulators manufacturing
When to use a different code
Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:
- Establishments primarily engaged in manufacturing electronic component-type transformers are classified in U.S. Industry 334416, Capacitor, Resistor, Coil, Transformer, and Other Inductor Manufacturing.
Activities listed under 335311
The Census index assigns these 37 activities to this code. If your business matches one, this is your code.
- Airport lighting transformers manufacturing
- Arc-welding transformers, separate solid-state, manufacturing
- Autotransformers for switchboards (except telephone switchboards) manufacturing
- Autotransformers manufacturing
- Ballasts (i.e., transformers) manufacturing
- Boosters, feeder voltage (i.e., electrical transformers), manufacturing
- Burner ignition transformers manufacturing
- Control transformers manufacturing
- Current limiting reactors, electrical, manufacturing
- Distribution transformers, electric, manufacturing
- Electric furnace transformers manufacturing
- Feeder voltage regulators and boosters (i.e., electrical transformers) manufacturing
- Fluorescent ballasts (i.e., transformers) manufacturing
- Fluorescent lighting transformers manufacturing
- Generator voltage regulators, electric induction and step-type (except engine electrical equipment), manufacturing
- Instrument transformers (except complete instruments) for metering or protective relaying use manufacturing
- Isolation transformers manufacturing
- Lamp ballasts manufacturing
- Lighting transformers manufacturing
- Lighting transformers, street and airport, manufacturing
- Line voltage regulators (i.e., electric transformers) manufacturing
- Luminous tube transformers manufacturing
- Machine tool transformers manufacturing
- Power transformers, electric, manufacturing
- Regulating transformers, power system-type, manufacturing
- Regulators (i.e., electric transformers), feeder voltage, manufacturing
- Saturable transformers manufacturing
- Signaling transformers, electric, manufacturing
- Specialty transformers, electric, manufacturing
- Substation transformers, electric power distribution, manufacturing
- Transformers, electric power, manufacturing
- Transformers, ignition, for use on domestic fuel burners, manufacturing
- Transformers, reactor, manufacturing
- Transformers, separate solid-state arc-welding, manufacturing
- Transmission and distribution voltage regulators manufacturing
- Voltage regulating transformers, electric power, manufacturing
- Voltage regulators, transmission and distribution, manufacturing
SBA size standard for 335311
To count as a small business for SBA loans and federal contracts under NAICS 335311, your business (including affiliates) must not exceed 800 employees. Check your business.
Source: SBA table of size standards, effective March 17, 2023.
Closest UK SIC 2007 codes
There is no official one-to-one link between NAICS and UK SIC. These codes share the same international class (ISIC Rev. 4: 2710), so treat them as a starting point and check the definition.
- 27110Manufacture of electric motors, generators and transformersUK SIC
- 27120Manufacture of electricity distribution and control apparatusUK SIC
Built from Census concordances 2022→2017 NAICS and 2017 NAICS→ISIC Rev. 4.
Similar codes to compare
Data last changed November 14, 2026. How this page is built.