Under what condition can existing two-wire, nongrounded-type receptacles be replaced with a two-wire nongrounding-type receptacle?

Replacing existing two-wire, nongrounded-type receptacles with another two-wire nongrounding type is acceptable where no equipment grounding conductor exists. This situation occurs because the National Electrical Code (NEC) allows for like-for-like replacements in installations where grounding conductors were not originally present.

In older homes, many circuits were installed without equipment grounding provisions, and while you cannot upgrade to grounded receptacles without installing new wiring that includes a grounding conductor, you can replace existing receptacles with the same type. This ensures compliance with electrical safety standards while maintaining the original configuration of the system.

Other conditions, such as locations in wet areas, kitchens, or outdoors, would typically require grounded receptacles due to the increased risk of electric shock, and therefore do not qualify for a simple like-for-like replacement.