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A grounding conductor is a means for providing safety for users of electrical devices that may have experienced an internal failure that causes an electrical short to metallic surfaces. In theory, such a short to a GROUNDED surface would quickly result in overcurrent or ground-fault interruption of the circuit, resulting in an dead but safe circuit. NEVER "reset" a GFCI while holding the attached device or without discovering what caused it to trip.

Were it not for a grounding conductor, the user could become the "grounding conductor" by accident, causing electrocution.

Grounding conductors maybe bare (copper) wires or have green insulation, or green with a yellow stripe (also used for bonding) or other green markings (green screws, green clips, green wire nuts, etc).

Grounded appliance plugs were not required in the NEC until the 1960s.

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