Yes, a Ground Fault Circuit Interrupter (GFCI) can provide protection to ungrounded outlets. GFCIs are designed to protect against electrical shocks caused by ground faults, which occur when current leaks from the electrical circuit to the ground. Grounding provides an additional layer of safety, but GFCIs can still function without a grounding conductor.
When you install a GFCI in a circuit that has ungrounded outlets, it will monitor the flow of current and compare the current going out to the current coming back. If there is an imbalance, which could indicate a ground fault, the GFCI will quickly trip, interrupting the circuit and protecting against electrical shocks.
It's important to note that while GFCIs offer protection against ground faults and electrical shocks, they do not provide the same level of protection against other electrical issues that grounding provides. Grounding helps protect against electrical surges and can help stabilize the electrical system.
If you have ungrounded outlets and want to improve safety, installing GFCIs is a good option. However, if possible, it's even better to upgrade the wiring to include grounding for enhanced protection. In older homes where retrofitting grounding may be challenging, using GFCIs is a valuable safety measure. Always consult a licensed electrician to ensure your electrical system meets safety standards and local codes.