Yes, LFMC (Liquidtight Flexible Metal Conduit) is generally considered sufficient physical protection for surface-mounted 120V circuits in a garage interior, provided it's installed correctly and meets the requirements of the National Electrical Code (NEC) and any local amendments.

Here's a more detailed breakdown: NEC Considerations

The NEC allows LFMC to be used in both dry and wet locations, as well as in situations where flexibility is required. Specifically, Article 350 covers LFMC. You need to ensure it is listed for the application.

Physical Protection

LFMC provides good physical protection against impact, abrasion, and other common hazards that might be present in a garage. It's far more robust than just running individual wires or using NM-B (Romex) without conduit.

Grounding

A key aspect is grounding. You must ensure proper grounding of the LFMC. It is important to comply with NEC 250.118 and 250.134 when using LFMC. Usually, this is achieved by using listed fittings that make a reliable electrical connection to the conduit and the equipment grounding conductor.

Support

LFMC must be properly supported according to the NEC. This usually involves using appropriate straps or clamps at regular intervals. Proper support prevents sagging and damage to the conduit.

Fittings

Use only listed fittings that are specifically designed for use with LFMC. Using the correct fittings is crucial for maintaining the liquidtight seal and ensuring proper grounding.

Areas to double check



Subject to Physical Damage

If the LFMC is in an area where it's highly likely to be damaged (e.g., frequently hit by a car, tools, or equipment), additional protection might be necessary. This could involve using a heavier gauge of LFMC, installing a guardrail, or considering a different wiring method altogether.

Local Codes

Local building codes may have stricter requirements than the NEC. Always check with your local electrical inspector to ensure your installation complies with all applicable regulations.

Exposed to specific chemicals

If your garage is used for chemical related work, it's worth checking whether LFMC is considered suitable for use in that environment.

Why LFMC might be preferred over EMT in your case

You mentioned limitations with EMT. LFMC offers several advantages:

Flexibility

LFMC is flexible, making it easier to navigate around obstacles and make bends without needing to use multiple fittings.*

Easier Installation

In some situations, LFMC can be faster and easier to install than EMT, especially when dealing with complex layouts or limited space.

In summary:

LFMC is generally acceptable for surface-mounted 120V circuits in a garage interior, as long as it is installed correctly, grounded properly, adequately supported, and protected from excessive physical damage. Always consult the NEC and local codes, and consider having a qualified electrician review your plans or perform the installation to ensure compliance and safety. Flag for review