- 3M
- ABB SSAC
- ABB Transformers
- Acme Transformers
- Insulated Wire
- Eaton – Arrow Hart
- AZZ – Rigalite
- Eaton / Powerware
- Blackburn Products
- Bowers Boxes & Fittings
- Bryant Wiring Devices
- Burndy
- Eaton / Buss Fuses
- Cablofil Cable Tray
- Cadweld
- Cantex
- Carlon
- Carol Cable
- Chance Poleline Hardware
- Channellock Tools
- Christy Boxes
- Eaton / B-Line
- Eaton / Cooper Power Systems
- CRC Chemicals
- Cree Lighting
- Eaton / Crouse-Hinds
- Eaton / Cutler-Hammer
- Dottie Products
- Duracell
- Electri-Flex Liquidtite Conduit
- Ericson
- Eveready
- Fargo
- Federal Signal
- Fluke
- G.E. Lamp
- Gardner Bender
- General Cable
- Greenlee
- G&W Reclosers
- Hastings
- Hitachi / HVB Breakers
- Holophane Lighting
- Houston Wire & Cable
- Hubbell Lighting
- Hubbell Power Systems
- Hyundai Ideal
- Ideal
- Inertia Engineering
- Intermatic
- Joslyn Poleline Hardware
- Kearney
- Killark
- Klein Tools
- Kortick Mfg.
- Knopp
- Lenox Tools
- Lindsey
- Lithonia Lighting
- Lusio / Flextronix Lighting
- Magntek Universal
- Malcolite
- Meltric
- Myers Hubs & Fittings
- Nelson Heat Trace
- NSI Industries
- Ocal
- Omron
- Pacific Crest Transformers
- PDU / Travis Pattern
- Penn-Union
- Philips Lamps
- Phoenix Contact
- Porcelain Products
- Post Glover
- Power-Strut
- Precision Controls
- Preformed
- Priority Wire and Cable
- PW Pipe
- RAB Lighting
- Raycap Surge Arresters
- Ridgid Tools
- Robroy
- SCE Saginaw Control
- Scott Engineering
- Selecta-Switch
- Service Wire
- Southwire
- SunRay
- SuperStrut
- Sylvania Lamps
- T&B [Thomas&Betts]
- Tatung Electric
- TCI Trans-Coil
- TIF Instruments
- Time Mark Timers
- Toshiba – TIC
- Tomar
- Unistrut
- United Wire Company
- Universal Ballast
- Warrick Controls
- Waukesha Transformers
- WD-40