A good grounding conductor can provide protection similar to the GFCI.

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A grounding conductor provides a low-resistance path for fault current to flow back to the source, which can help to prevent electrical shock. A GFCI (ground fault circuit interrupter) is a device that monitors the current flowing through the hot and neutral conductors and trips the circuit if it detects a difference, which can indicate a ground fault. Both grounding conductors and GFCIs can help to protect against electrical shock, but they work in different ways.

A Good Grounding Conductor Can Provide Protection Similar to the GFCI