I am in the middle of a basement finishing project and plan on upgrading two 15amp breakers to 20amp and re-running with correct wiring to support 20amp load. Do all my outlets need to be GFCI given that the basement is more than 50% below grade? Or does the bathroom I'm putting in need GFCI only?
Additionally, are tamper resistant plugs mandatory per US residential code? I read somewhere they are but my house doesn't have them?