HD Electric’s GFCI Extension Clip Cord is a grounded extension cord with a built-in GFCI circuit that provides 120V without having to carry a power supply.

In place of a power supply, all a utility worker needs to do to start using the extension cord is attach it to the terminals of a meter socket or transformer with alligator clips.  The extension cord also features a neon light to verify that the GFCI is properly working.