Here's a video that can be down-loaded and viewed on your PC.

http://www.osha.gov/SLTC/video/groundfault/video.html

You have the choice of speeds, depending upon wether you have Dial-up or ADSL Net access.

This video runs for about 14 minutes and sure it is reasonably basic, but, it would make a good tool for training Apprentices and other people entering the Construction Industry.
Enjoy. [Linked Image]

Mike :]