Analysis
NAICS 335311 is the 2022 national industry for power, distribution, and specialty transformer manufacturing, part of 33531 (Electrical Equipment Manufacturing). Census lists 37 example activities under it in the official index.
Between 2018 and 2023 the number of establishments fell 15% and employment rose 39%. The 2018 count used NAICS 2017, so part of a large move can come from codes being redefined rather than from businesses opening or closing.
By establishments it ranks 4th of the 4 codes at this level within Electrical Equipment Manufacturing, with 13.5% of them.
County Business Patterns counts 242 US establishments in this code in 2023, employing 26,731 people at an average annual payroll of $69,835 per employee (52nd percentile of national industries). 23% of the establishments have fewer than five employees, which points to larger operations.
Its index entries, the activities Census uses to assign businesses to this code, include airport lighting transformers manufacturing, arc-welding transformers, separate solid-state…, autotransformers for switchboards (except telephone… and autotransformers manufacturing, among 37 in all.
Its goods appear in 19 statistical lines of the US tariff schedule, mostly under headings 8504 (electrical transformers, static converters (for example…) and 9032 (automatic regulating or controlling instruments and…). That link is how import data is matched to domestic producers, for example in trade-remedy cases.
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.
Illustrative Examples:
Fluorescent ballasts (i.e., transformers) manufacturing Substation transformers, electric power distribution, manufacturing Distribution transformers, electric, manufacturing Transmission and distribution voltage regulators manufacturing
Source: US Census Bureau, NAICS 2022 Manual.
Not this code if…
| The business mainly does | Use instead |
|---|---|
| Manufacturing electronic component-type transformers | 334416 Capacitor, Resistor, Coil, Transformer, and Other Inductor Manufacturing |
Index entries (37)
- 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