Question

When a GFCI is installed on a two-wire non-grounded system, it provides?

a. Full grounding protection
b. No protection as there is no ground wire
c. Fault protection, but not grounding protection
d. A false reading when testing the GFCI using the built-in test button on the unit

Answer 1

A GFCI installed on a two-wire non-grounded system provides fault protection, but not grounding protection, option c.

Step-by-step explanation:

When a GFCI is installed on a two-wire non-grounded system, it provides fault protection, but not grounding protection.

A GFCI works by comparing the currents in the live/hot and neutral wires. If there is a difference in currents, it indicates a leakage current or fault, and the GFCI will trip, interrupting the circuit and preventing shock hazards.

However, since there is no ground wire in a two-wire system, the GFCI cannot provide grounding protection.