There are about 19 directories in all. The ones likely to be of interest to an electrician are:
Electrical Appliance & Utilization Equipment
Electrical Construction Equipment (green book)
Hazrdous Locations Equipment
General Information for Electrical Equipment (white book)
The ones I've found to be most useful are the White Book & the Green Book. The Green Book lists names & addresses of manufacturers of listed equipment.
Tom
Most directories are free for anyone who is an electrical inspector.
