If your 2-wire electrical outlet is allowable, then just fold back the
unused ground wire. �Do not install a 3-hole outlet if it is not
properly grounded. �However since this is a safety issue, it would be
a very good investment and wise to upgrade all 2-wire outlets to
grounded outlets.-
yeah homes around here were all 2 prong 1950 vintage
I upgraded 2 to all grounded added GFCIs and helped some neighbors do
the same. BX made it easy