May a GFCI receptacle be installed as a replacement in an old installation where the wire circuit has no equipment grounding conductor?

Yes, a GFCI receptacle can be installed as a replacement in an old installation without an equipment grounding conductor. In such cases, the GFCI will provide ground fault protection, which is essential for safety. It is important to label the GFCI as "No Equipment Ground" to inform users that it is not grounded. However, it is advisable to consult local electrical codes and a qualified electrician for compliance with specific regulations.