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Glossary of Terms (continued)

fixed wiring permanent wiring installed in homes and other buildings

flexible wiring cables with insulated and stranded wire that bends easily

fuse overcurrent protection device that has an internal part that melts and shuts off the current in a circuit if there is an overload

GFCI ground fault circuit interrupter—a device that detects current leakage from a circuit to ground and shuts the current off

ground physical electrical connection to the earth

ground fault loss of current from a circuit to a ground connection

ground potential voltage a grounded part should have; 0 volts relative to ground

guarding covering or barrier that separates you from live electrical parts

insulation material that does not conduct electricity easily

leakage current current that does not return through the intended path, but instead "leaks" to ground

lock-out applying a physical lock to the energy sources of circuits and equip- ment after they have been shut off and de-energized

milliampere (milliamp or mA) 1/1,000 of an ampere

NEC National Electrical Code—comprehensive listing of practices to pro- tect workers and equipment from electrical hazards such as fire and electrocution

neutral at ground potential (0 volts) because of a connection to ground

NFPA 70E Standard for Electrical Safety in the Workplace This standard addresses those electrical safety requirements for employee workplaces that are necessary for the practical safeguard- ing of employees. It covers the installation of electrical conductors, electrical equipment, signaling and communications conductors and equipment, and raceways, excluding generating plants, substations, and control centers.

ohm unit of measurement for electrical resistance

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