SIC 3612 Power, Distribution, and Specialty Transformers

This category covers establishments primarily engaged in manufacturing power, distribution, instrument, and specialty transformers. Radio frequency or voice frequency electronic transformers, coils, and chokes are classified in SIC 3677: Electronic Coils, Transformers, and Other Inductors, and resistance welder transformers are part of SIC 3548: Electric and Gas Welding and Soldering Equipment.

SIC 3613 Switchgear and Switchboard Apparatus

This category covers establishments primarily engaged in manufacturing switchgear and switchboard apparatus. Important products of this industry include power switches, circuit breakers, power switching equipment, and similar switchgear for general industrial application; also, switchboards and cubicles, control and metering panels, fuses and fuse mountings, and similar switchboard apparatus and supplies.

SIC 3621 Motors and Generators

This classification comprises establishments primarily engaged in manufacturing power generators, motor generator sets, and electric motors, excluding engine-starting motors. Also covered in this classification are establishments primarily involved in manufacturing railway motors and control equipment, as well as motors, generators, and control equipment for gasoline, electric, and oil-electric buses and trucks.

SIC 3624 Carbon and Graphite Products

This category covers establishments primarily engaged in manufacturing carbon, graphite, and metal-graphite brushes and brush stock; carbon or graphite electrodes for thermal and electrolyticuses; carbon and graphite fibers; and other carbon, graphite, and metal-graphite products.

SIC 3625 Relays and Industrial Controls

This category covers establishments primarily engaged in manufacturing electronic relays and industrial controls used for starting, regulating, stopping, and protecting circuits and electric motors. Mechanical switches and relays are classified elsewhere.

SIC 3629 Electrical Industrial Apparatus, Not Elsewhere Classified

This category covers companies that primarily make industrial and commercial electric apparatus, such as fixed and variable capacitors and rectifiers for industrial applications.

SIC 3631 Household Cooking Equipment

This category covers establishments primarily engaged in manufacturing household electric and nonelectric cooking equipment, such as stoves, ranges, and ovens, except portable electric appliances. This industry includes establishments primarily engaged in manufacturing microwave and convection ovens, including portable.

SIC 3632 Household Refrigerators and Home and Farm Freezers

This category covers establishments primarily engaged in manufacturing household refrigerators and home and farm freezers. Establishments primarily engaged in manufacturing commercial and industrial refrigeration equipment, packaged room coolers, and all refrigeration compression and condenser units are classified in SIC 3585: Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipment, and those manufacturing portable room dehumidifiers are classified in SIC 3634: Electric Housewares and Fans.

SIC 3633 Household Laundry Equipment

This classification covers establishments primarily engaged in manufacturing laundry equipment, such as washing machines, dryers, and ironers, for household use, including coin-operated equipment. Establishments primarily engaged in manufacturing commercial laundry equipment are classified in SIC 3582: Commercial Laundry, Dry cleaning, and Pressing Machines, while those manufacturing portable electric irons are classified in SIC 3634: Electric Housewares and Fans.

SIC 3634 Electric Housewares and Fans

This category includes establishments primarily engaged in manufacturing electric housewares for heating, cooking, and other purposes; and electric household fans, except attic fans. Important products of this industry include household-type ventilation and exhaust fans; portable household cooking appliances, except convection and microwave ovens; electric space heaters; electrically heated bed coverings; electric scissors; and portable humidifiers and dehumidifiers.

SIC 3635 Household Vacuum Cleaners

This classification covers establishments primarily engaged in manufacturing vacuum cleaners for household use. Establishments primarily engaged in manufacturing vacuum cleaners for industrial use are classified in SIC 3589: Service Industry Machinery, Not Elsewhere Classified.

SIC 3639 Household Appliances, Not Elsewhere Classified

This industry includes establishments primarily engaged in manufacturing household appliances, not elsewhere classified, such as water heaters, dishwashers, food waste disposal units, and household sewing machines. Major product groups include water heaters, dishwashers, food disposers, trash compactors, floor waxers, and sewing machines.

SIC 3641 Electric Lamp Bulbs and Tubes

This industry classification covers establishments primarily engaged in manufacturing electric bulbs, tubes, and related light sources. Important products of this industry include incandescent filament lamps, vapor and fluorescent lamps, photoflash and photoflood lamps, and electrotherapeutic lamp units for ultraviolet and infrared radiation.

SIC 3643 Current-Carrying Wiring Devices

The current-carrying wiring devices industry is comprised of establishments principally engaged in manufacturing current-carrying wiring devices, primarily interior electrical components used to connect equipment to a power source.

SIC 3644 Noncurrent-Carrying Wiring Devices

The noncurrent-carrying wiring devices industry is made up of companies that primarily manufacture hardware used to support electrical systems. Popular products include electrical conduits and fittings, boxes for outlets, switches, and fuses, and pole and transmission line devices.

SIC 3645 Residential Electric Lighting Fixtures

The residential electric lighting fixtures industry encompasses manufacturers that produce a variety of equipment and components for home use. Popular offerings include chandeliers, desk and floor lamps, glass and metal lamp shades, yard lights, and wall-mounted lighting fixtures.

SIC 3646 Commercial, Industrial, and Institutional Electric Lighting Fixtures

The commercial lighting fixture industry is comprised of establishments primarily engaged in manufacturing electric lighting fixtures for commercial, industrial, and institutional customers. Popular industry offerings include hotel and restaurant chandeliers, desk and floor lamps for offices, luminous ceiling panels, and industrial fluorescent lighting fixtures.

SIC 3647 Vehicular Lighting Equipment

This category includes establishments primarily engaged in manufacturing vehicular lighting equipment. Establishments primarily engaged in manufacturing sealed-beam lamps are classified in SIC 3641: Electric Light Bulbs and Tubes.

SIC 3648 Lighting Equipment, Not Elsewhere Classified

This classification covers establishments primarily engaged in manufacturing miscellaneous lighting fixtures and equipment, electric and non-electric, not elsewhere classified. Examples of such products include flashlights and similar portable lamps, searchlights, ultraviolet lamp fixtures, and infrared lamp fixtures.

SIC 3651 Household Audio and Video Equipment

This category includes establishments primarily engaged in manufacturing electronic audio and video equipment for use at home or in automobiles, such as televisions, video recorders and players, radio receivers and amplifiers, phonographs, cassette tape players, and compact disc (CD) players. This industry also includes companies that manufacture microphones, speakers, and public address systems.

SIC 3652 Phonograph Records and Prerecorded Audio Tapes and Disks

This category includes establishments primarily engaged in manufacturing phonograph records and prerecorded audio tapes and disks. Establishments primarily engaged in the design, development, and production of prepackaged computer software are classified in Computer Programming, Data Processing, and Other Computer Related Services; and those reproducing prerecorded video tape cassettes and disks are classified in the Motion Picture industries.

SIC 3661 Telephone and Telegraph Apparatus

This industry covers establishments primarily engaged in manufacturing wire telephone and telegraph equipment. Included are establishments manufacturing modems and other telephone and telegraph interface equipment.

SIC 3663 Radio and Television Broadcasting and Communications Equipment

This industry manufactures radio and television broadcasting and communications equipment. Important products of this industry are closed-circuit and cable television equipment; studio audio and video equipment; light communications equipment; transmitters, transceivers, and receivers (except household and automotive); cellular radio telephones; fiber optics equipment; communication antennas; receivers; RF power amplifiers; satellite communications systems (space and ground segments); and fixed and mobile radio systems.

SIC 3669 Communications Equipment, Not Elsewhere Classified

This classification covers companies primarily engaged in manufacturing communications and related equipment, not elsewhere classified. Important products of this industry include intercommunication equipment, traffic signaling equipment, and fire and burglar alarm apparatus.

SIC 3671 Electron Tubes

This category covers establishments primarily engaged in manufacturing electron tubes and tube parts. Establishments primarily engaged in manufacturing X-ray tubes and parts are classified in SIC 3844: X-Ray Apparatus and Tubes and Related Irradiation Apparatus; those manufacturing liquid crystal displays (LCDs) are classified in SIC 3679: Electronic Components, Not Elsewhere Classified; those manufacturing computer terminals are classified in SIC 3575: Computer Terminals.

SIC 3672 Printed Circuit Boards

This category includes establishments primarily engaged in the manufacture of printed circuit boards, sometimes referred to as printed wiring boards.

SIC 3674 Semiconductors and Related Devices

This category covers establishments primarily engaged in manufacturing semiconductors and related solid-state devices. Important products of this industry are semiconductor diodes and stacks, including rectifiers, integrated microcircuits (semiconductor networks), transistors, solar cells, and light sensing and emitting semiconductor (solid-state) devices.

SIC 3675 Electronic Capacitors

This category covers establishments primarily engaged in manufacturing electronic capacitors. Establishments primarily engaged in manufacturing electrical capacitors are classified in SIC 3629: Electrical Industrial Apparatus, Not Elsewhere Classified.

SIC 3676 Electronic Resistors

This category covers establishments primarily engaged in manufacturing electronic resistors. Establishments primarily engaged in manufacturing resistors for telephone and telegraph apparatus are classified in SIC 3661: Telephone and Telegraph Apparatus.

SIC 3677 Electronic Coils, Transformers, and Other Inductors

This industry classification includes establishments primarily engaged in manufacturing electronic coils, transformers, and inductors. Establishments primarily engaged in manufacturing electrical transformers are classified in SIC 3612: Power, Distribution, and Specialty Transformers; those manufacturing transformers and inductors for telephone and telegraph apparatus are classified in SIC 3661: Telephone and Telegraph Apparatus; and those manufacturing semiconductors and related devices are classified in SIC 3674: Semiconductors and Related Devices.

SIC 3678 Electronic Connectors

This industry is comprised of manufacturers of electronic connectors, e.g. coaxial, cylindrical, rack and panel, and printed circuit connectors.

SIC 3679 Electronics Components, Not Elsewhere Classified

The Electronic Components, Not Elsewhere Classified industry segment is comprised of firms primarily engaged in manufacturing a multitude of miscellaneous electronic devices. Examples of more popular industry offerings include automobile antennas, oscillators, mechanical rectifiers, solenoids, quartz crystals, and electronic switches.

SIC 3691 Storage Batteries

This category is comprised of establishments primarily engaged in manufacturing storage batteries, including alkaline cell storage batteries, rechargeable batteries, lead acid storage batteries, nickel cadmium storage batteries, and other types of storage batteries.

SIC 3692 Primary Batteries, Dry and Wet

This industry covers establishments primarily engaged in manufacturing primary batteries, dry or wet.

SIC 3694 Electrical Equipment for Internal Combustion Engines

This classification covers establishments primarily engaged in manufacturing electrical equipment for internal combustion engines. Important products of this industry include armatures, starting motors, alternators, and generators for automobiles and aircraft, and ignition apparatus for internal combustion engines, including spark plugs, magnetos, coils, and distributors.

SIC 3695 Magnetic and Optical Recording Media

This classification comprises establishments primarily engaged in manufacturing blank tape, disk, or cassette magnetic or optical recording media for use in recording audio, video, or other signals. Excluded from this classification are establishments primarily engaged in manufacturing blank or recorded records and prerecorded audio tapes, which are included within the scope of SIC 3652: Prerecorded Records & Tapes.

SIC 3699 Electrical Machinery, Equipment, and Supplies, Not Elsewhere Classified

This classification comprises establishments primarily engaged in manufacturing electrical machinery, equipment, and supplies, not elsewhere classified, including high-energy particle acceleration systems and equipment, electronic simulators, appliance and extension cords, bells and chimes, and insect traps.