Where should a GFCI be installed when an extension cord is being used?

A GFCI, or Ground Fault Circuit Interrupter, is designed to protect against electrical shock by monitoring the flow of electricity through a circuit and cutting off power if an imbalance is detected. When using an extension cord, the most effective way to ensure protection is to have the GFCI installed at the receptacle where the extension cord is plugged in.

This setup ensures that any equipment connected downstream of the extension cord is protected by the GFCI. If the GFCI is properly installed at the receptacle, it can interrupt the current and prevent electrical shocks if an individual comes into contact with a grounded object while using devices connected to the extension cord.

Installing a GFCI at the cord's plug or midpoint would not adequately protect the circuit as it would only monitor the specific section of the cord and not cover the entire circuit or any devices plugged into it. Similarly, placing it at the breaker panel would not directly provide protection for users operating appliances connected through an extension cord, as the GFCI must be in close proximity to where the equipment is being used. Thus, the receptacle location is the most logical and effective choice for GFCI installation when utilizing an extension cord.