At least in the US, permanently-installed generators are SUPPOSED to be connected through a "transfer switch" which prevents "backfeeding" the utility grid. Of course, the incorrect connections outnumber the code-compliant ones by a considerable margin!
The usual illegal setup is a "suicide cord" with 2 male plugs, connected between the generator and a nearby outlet. A serious hazard to the user, as well as utility repair crews.
A "Wiggy" is a solenoid type voltage tester which electricians have been using for years. Less precise than a DMM, but more rugged and less susceptible to false readings and electrical noise due to a low input impedance. Picture/description available at:
http://www.mytoolstore.com/klein/69115.html