When is liquidtight flexible metal conduit permitted to be used as an equipment grounding conductor?

Liquidtight flexible metal conduit (LFMC) can be used as an equipment grounding conductor under specific conditions that prioritize its effectiveness in grounding. This type of conduit is typically employed to protect electrical wiring in environments where moisture, exposure, or movement may occur, but its grounding capabilities require special consideration.

The use of LFMC is permitted as an equipment grounding conductor when it is not required to maintain flexibility after installation. This is because the grounding function relies on a continuous, conductive path for fault current. If LFMC is allowed to be flexible, there could be movement and potential disconnections over time, compromising its ability to maintain a reliable ground path. By ensuring that it is not required to be flexible, the conduit can provide a more stable grounding solution that meets safety standards.

In summary, LFMC can serve as an effective equipment grounding conductor only when its movement does not risk disrupting the integrity of the grounding system. This condition emphasizes the need for a reliable and continuous grounding path in electrical installations.