Its required by current US NEC code but older house are grandfathered in unless they do major renovation. Also some exceptions like outlets high enough to be out of reach of kids.
Its possible that the UK/NZ plugs have better designs. The code improves step by step here.
Its required by current US NEC code but older house are grandfathered in unless they do major renovation. Also some exceptions like outlets high enough to be out of reach of kids.
Its possible that the UK/NZ plugs have better designs. The code improves step by step here.