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GFI's are required by the electrical code for receptacles in bathrooms, some kitchen receptacles, some outside receptacles, and receptacles near swimming pools. The GFI has a "Test" button which causes a small difference between "hot" and neutral currents to test the device.GFI's are required by the electrical code for receptacles in bathrooms, some kitchen receptacles, some outside receptacles, and receptacles near swimming pools. The GFI has a "Test" button which causes a small difference between "hot" and neutral currents to test the device. A GFI does not require an earth ground to work (protect people from currents >10mA). A surge suppressor requires an earth ground to function properly (protect equipment from high voltages).