From the U.S. Dept. of Labor: Occupational Safety and Health Administration.
http://www.osha.gov/SLTC/etools/electric_power/illustrated_glossary/index.html
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From the U.S. Dept. of Labor: Occupational Safety and Health Administration.
http://www.osha.gov/SLTC/etools/electric_power/illustrated_glossary/index.html