Elec Ref is an iPhone app for electricians and electrical engineers. Its features include a wire sizing calculator, conduit sizing, transformer kVA, electric motor horsepower and amps, NEMA plug reference, wire colors, and Ethernet plug wiring and more. Elec Ref has a nice, interactive user interface and the developers are updating it regularly to add features that customers request. [URL="http://itunes.apple.com/us/app/elec-ref/id360723129?mt=8&at=10l3Vy]See Elec Ref in iTunes.[/URL]