NAICS 335999

Overview

The North American Industry Classification System (NAICS) is the U.S. standard for classifying business establishments to support collection, analysis, and publication of economic statistics. Developed under the Office of Management and Budget with Statistics Canada and Mexico’s INEGI, it was adopted in 1997 and is updated on a five-year cycle; 2022 is the most recent vintage. ¹

NAICS 335999 covers establishments primarily engaged in manufacturing industrial and commercial electric apparatus and other electrical equipment not classified in lighting equipment, household appliances, transformers, motors, generators, switchgear, relays, industrial controls, batteries, communication and energy wire and cable, wiring devices, or carbon/graphite products. It includes static power converters (AC↔DC, DC↔AC), general-purpose power supplies (including consumer-type external adapters), surge suppressors, and similar finished apparatus. ²

See also on G2X:

• NAICS 335999 — overview
• NAICS 33441 — Semiconductor and Other Electronic Component Manufacturing
• NAICS 335991 — Carbon and Graphite Product Manufacturing

What this NAICS covers

• Standalone industrial- and commercial-type electric apparatus not elsewhere classified in more specific electrical equipment industries. ²
• Static power converters (rectifiers, inverters, and other AC↔DC / DC↔AC equipment). ²
• General-purpose and consumer external power supplies and adapters (e.g., AC adapters, “power bricks”). ²
• Surge suppressors, line-voltage protectors, and power conditioning devices. ²

Related NAICS and PSC codes

Related NAICS (adjacent or commonly confused manufacturing categories)

• NAICS 335314 — Relay and Industrial Control Manufacturing (industrial relays, contactors, control components; distinct from standalone power conversion/supply units).
• NAICS 335315 — Switchgear and Switchboard Apparatus Manufacturing (panelboards, switchboards, circuit breakers; not general-purpose power supplies).
• NAICS 335311 — Power, Distribution, and Specialty Transformer Manufacturing (transformers and voltage regulators rather than integrated power supply/conversion assemblies).
• NAICS 335312 — Motor and Generator Manufacturing (rotating electrical machines; contrasts with nonrotating/static converters).
• NAICS 335911 — Storage Battery Manufacturing (rechargeable/secondary batteries; separate from power conditioning or supply units that may incorporate them).
• NAICS 335912 — Primary Battery Manufacturing (nonrechargeable batteries and cells; battery manufacturing is outside 335999).
• NAICS 335931 — Current-Carrying Wiring Device Manufacturing (cord sets, power strips, plugs/receptacles; different from dedicated power converters/supplies).
• NAICS 335932 — Noncurrent-Carrying Wiring Device Manufacturing (junction boxes, raceways; not power supplies).
• NAICS 335991 — Carbon and Graphite Product Manufacturing (electrodes and brushes; distinct from power conversion equipment).
• NAICS 334416 — Electronic Coil, Transformer, and Other Inductor Manufacturing (passive magnetic components used inside power supplies).
• NAICS 334418 — Printed Circuit Assembly (Electronic Assembly) Manufacturing (contract assembly of PCBAs used in power supplies/converters).
• NAICS 334419 — Other Electronic Component Manufacturing (surge suppression components and other parts that may be integrated into final 335999 products).

Common PSC pairings for federal buys coded under NAICS 335999

• PSC 6130 — Converters, Electrical, Nonrotating (AC-DC and DC-AC power supplies, rectifiers, inverters, and UPS/conditioners categorized as static power conversion).
• PSC 6150 — Miscellaneous Electric Power and Distribution Equipment (power distribution units, power conditioners, rack PDUs, and related apparatus).
• PSC 5920 — Fuses, Arresters, Absorbers, and Protectors (surge protective devices and transient voltage suppressors).
• PSC 5925 — Circuit Breakers (overcurrent protection used with distribution/switchgear; adjacent to NAICS 335315 scope).
• PSC 5950 — Coils and Transformers (magnetics used within power conversion; complementary to NAICS 334416/335311 manufacturing).
• PSC 5945 — Relays and Solenoids (control components often paired with power systems; manufactured under NAICS 335314).
• PSC 6145 — Wire and Cable, Electrical (line cords/leads paired with power supplies; manufacturing falls under NAICS 335931/335932).
• PSC 6135 — Batteries, Nonrechargeable (primary cells used with portable power systems; battery manufacturing not in NAICS 335999).
• PSC 6140 — Batteries, Rechargeable (storage/secondary batteries used in UPS and backup systems; manufacturing classified outside NAICS 335999).
• PSC J061 — Maintenance, Repair, and Rebuilding of Equipment—Electric Wire, and Power and Distribution Equipment (service support for installed power systems and UPS).
• PSC N061 — Installation of Equipment—Electric Wire, and Power and Distribution Equipment (installation/commissioning services for power conversion and distribution equipment).

Frequently asked questions

• What kinds of products does NAICS 335999 cover?
  It encompasses standalone electrical power conversion and conditioning apparatus—such as AC-to-DC and DC-to-AC converters, general-purpose power supplies, surge suppressors, and similar equipment—when not more specifically classified under other electrical equipment industries. ²

• Are consumer AC adapters and “power bricks” included in NAICS 335999?
  Yes. Consumer-type external power supplies and adapters (e.g., wall adapters, USB power adapters) fall within this industry when the establishment’s primary activity is manufacturing standalone power supply/conversion units. Battery manufacturing itself is classified elsewhere. ²

• How is NAICS 335999 different from NAICS 335314?
  NAICS 335314 covers relays, contactors, and industrial control components. NAICS 335999 captures standalone power conversion/supply apparatus (e.g., inverters, rectifiers, AC/DC power supplies) not otherwise classified. ³

• Are batteries included in NAICS 335999?
  No. Battery manufacturing is classified separately under NAICS 335911 (storage/rechargeable) and NAICS 335912 (primary/nonrechargeable). NAICS 335999 covers power conversion and supply apparatus, not batteries. ²

• Which PSC codes commonly align with NAICS 335999 in federal procurements?
  Common pairings include PSC 6130 (Converters, Electrical, Nonrotating) for static converters/power supplies and PSC 6150 (Miscellaneous Electric Power and Distribution Equipment) for related distribution apparatus, per the Product and Service Codes Manual. ⁴

Useful resources

• NAICS 2022 industry page for this code (official Census search entry) — direct link to the detailed definition, examples, and cross-references for NAICS 335999: https://www.census.gov/naics/?input=335999&year=2022&details=335999
• NAICS 2022 homepage — access the full manual, structure, and search for related industries: https://www.census.gov/naics/?year=2022
• NAICS 2017 to 2022 concordance — view how definitions and codes changed between vintages, useful for historical spend and trend analysis: https://www.census.gov/naics/concordances/2017_to_2022_NAICS.htm
• SBA size standards — find the current small business size standard applicable to this NAICS under SBA’s official table: https://www.sba.gov/size-standards
• Product and Service Codes (PSC) Manual — official DoD/Acquisition.gov PSC definitions used alongside NAICS in federal procurement: https://www.acquisition.gov/psc-manual
• PSC Tool (psctool.us) — searchable PSC reference to help align products like static converters, UPS, and distribution equipment with appropriate PSCs: https://psctool.us/
• eCFR: DOE energy conservation/test requirements for external power supplies — core federal efficiency requirements and test method (10 CFR Part 430, Subpart B, Appendix Z): https://www.ecfr.gov/current/title-10/part-430/appendix-Appendix%20Z%20to%20Subpart%20B%20of%20Part%20430
• ENERGY STAR criteria for external power supplies — voluntary federal efficiency specification and qualified product listings: https://www.energystar.gov/products/external_power_supplies
• OSHA Nationally Recognized Testing Laboratory (NRTL) program — list of labs authorized to certify electrical equipment to safety standards often required in solicitations: https://www.osha.gov/nrtl
• FCC equipment authorization — guidance and databases for compliance with electromagnetic interference rules (e.g., Part 15) that may affect power supplies and converters: https://www.fcc.gov/oet/ea

References

1. U.S. Census Bureau — NAICS main page (overview, development under OMB, five-year revisions, latest 2022): https://www.census.gov/naics/
2. U.S. Census Bureau — 2022 NAICS industry definition and examples for 335999: https://www.census.gov/naics/?input=335999&year=2022&details=335999
3. U.S. Census Bureau — 2022 NAICS industry definition for 335314: https://www.census.gov/naics/?input=335314&year=2022&details=335314
4. Acquisition.gov — Product and Service Code (PSC) Manual: https://www.acquisition.gov/psc-manual