OAONAN GFCI Adapter 15 Amp 3 Prongs Grounded, Waterproof, GFCI Plug Portable with One Outlet and Male Plug-in Ground Fault Circuit Interrupter to Protect Electric Safety - Amazon.com
WHAT IS A GFCI (GROUND FAULT CIRCUIT INTERRUPTER) AND HOW DOES IT WORK? — RSB Electrical Inc.
Ground Fault Plug-User Attachable
TRANSMISSION LINES DESIGN and ELECTRICAL ENGINEERING HUB: GROUND FAULT CURRENT INTERRUPTER (GFCI) TUTORIALS AND PDF LINKS
What Are GFCI Outlets and Where Are They Required?