Answer to your first question..you don't use it, you loose it....
Some guys have nothing to do with them, they studied to get their license, and forgot about them, because they don't see, or work with them.
Ask most Resi guys around me about a transformer, and they will likely think your talking about a doorbell transformer.
Do a search on this site, there is some great info available here. And ask some questions if you want, most guys here will be happy to help out....
The technical area has great drawings avail for your viewing...
Dnk...
