January 2012
Intermediate to advanced
176 pages
7h 37m
English

CHARLES DALZIEL, A UC BERKELEY professor who studied electricity’s effect on animals and humans and reputedly did a fair amount of testing on himself, realized that most accidental electrocutions happened because of a ground fault in home electrical circuits. So he set out to develop the Ground Fault Circuit Interrupter (GFCI), which monitors the current and instantly trips it when detecting an imbalance of as little as 5mA, a level his tests determined to be harmless. Dalziel patented the device in 1965, and the GFCI was later incorporated into the National Electrical Code, requiring GFCI outlets ...