Ground-Fault Circuit Interrupter Receptacles: Electrical Shock Protection, Slides of Applied Mechanics

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Ground Fault Circuit Interrupter

Receptacles

• Electrical

Shock

Protection

Ground-fault circuit-interrupter

• The ground-fault circuit- interrupter (GFCI) receptacle protects against electrical shock caused by a faulty appliance, or a worn cord or plug
• It senses small changes in current flow and can shut off power in as little as 1/40 of a second.

Ground-fault circuit-interrupter

• The GFCI receptacle may be wired to protect only itself (single location)
• Or it can be wired to protect all receptacles, switches, and light fixtures from the GFCI "forward" to the end of the circuit (multiple locations).

Ground-fault circuit-interrupter

• Most GFCls use

standard screw

terminal connections

• Some have wire

leads and are

attached with wire

connectors

Ground-fault circuit-interrupter

• The more receptacles any one GFCI protects The more susceptible it is to "phantom tripping,“ - Resulting in shutting off power. Due to tiny, normal fluctuations in current flow.

Single Location Protection

• A GFCI wired for single-location protection (shown from the back) has hot and neutral wires connected only to the screw terminals marked LINE
• A GFCI connected for single-location protection may be wired as either an end-of-run
• Or middle-of-run configuration

Multiple- Location Protection

• A GFCI receptacle connected for

multiple-location protection may be wired only as a middle-of-run configuration.