406.4(D)(2) Non-Grounding-Type Receptacles.

When replacing a non-grounding type receptacle with a GFCI type, the receptacle or the cover plate must be marked “No equipment ground”.

What to Know About Buying Houses with Ungrounded Outlets

Does replacing unrounded outlets with GFCI outlets make them grounded and safe? - Quora

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grounding - Does a non grounded GFCI meet code? - Home Improvement Stack Exchange

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1National Electrical Manufacturers Association 2011 Tamper-Resistant Electrical Receptacles NEC ® Updates The Opportunity for Continued Child Safety. - ppt download

Why Are Two Prong Outlets Dangerous?- Home Performance Group LLC

10-3 NONGROUNDING RECEPTACLES - 406.4(D)(2), (D)(3), AND Ex.

Replacing Two-Wire Receptacles

AFCI Safety Receptacles

NEC 2023 Basics: Equipment Grounding Conductor Continuity and Connections - Technical Articles