Recently I have been upgrading the old 15A outlets in my house to Leviton 20A 125V GFCI outlets (The wire size is 12AWG). It is a much older style home. So, for some strange reason the ground wire is present only in the 220V outlets. So, I had to add some additional ground wires from here to some possible 110V outlets like for my refrigerator outlets etc. There are also some outlets with a blank next to it. I'm adding some Leviton T5832-2BW (w/ USB ports) as load outlets.
I have a few questions:
Are GFCI okay to use with refrigerators? I'm a bit concerned if they tripped/malfunctioned the outlet might shut off since these are electronic based outlets. Is it mandatory as per code?
Do GFCI outlets react same without ground wire? I read that they detect change in current in L & N.
Is the USB output 5V (Type A & Type C) from these outlets safe & reliable like the ones from USB chargers? I know Leviton is a reliable brand but still I've never used one before.