Electricity 4: AC/DC Motors, Controls, and Maintenance - Jeffrey J. Keljik - Google Books

http://books.google.de/books?id=y69O8PnwLbYC&pg=PA311&lpg=PA311#v=onepage&q&f=false

Obtain quick and easy access to information on DC and AC motors, various types of manual, magnetic, and electronic controls, and the installation and maintenance functions of each. Updated to the 2008 National Electrical Code and featuring safety…