A good idea would be to go to one of the home centers and go into the Electrical supply area and familiarize yourself with all the different kinds of boxes, switches, disconnects, electrical components,etc. you are going to run across in your HI career. As new things come out it is always a good idea for all of us to keep abreast of what is out there. A couple of excellent publications to help you learn along the way are: "Electrical Inspections of Existing Dwellings by Douglas Hansen, Redwood Kardon and Mike Casey (available thru ITA, item #B132) and a book by Rex Cauldwell, “Inspecting a House”. Both are worth their weight in gold. They show the other side of the business, the good, the bad and the ugly of what you will really see in the real world. Happy hunting.