20 amp NEMA 5 sockets are NOT standard in U.S. homes and most businesses, though they're more frequently found in shop/industrial type business locations.

 You will find exceptions SOMETIMES in newer homes or homes that have upgraded wiring, used mostly for medium-sized window A/C units and washers, or sometimes in garages/shop areas.

 You'll also find occasional NEMA 6 220v series sockets, usually intended for use with electric driers, electric hot water heaters, or large (most 25,000 BTU and up) window A/C units.

The STANDARD is a NEMA 5-15 dual socket for almost ALL outlets in the large marjority of US homes.



 Most of the power connectors I've seen in the pair of hospitals I've been in this year were GFI NEMA 5-20.

 This is not a "hospital grade" connector as such, GFI is specified for any location that wetness or other higher risk of shock hazards can be found, though that "higher risk" issue is why pretty much all line-powered medical equipment specifies connection to a GCI-equipped circuit and therefore that type of outlet is the norm in most areas of a hospital.