Yes, a 6-foot length of Liquidtight Flexible Nonmetallic Conduit (LFNC) whip from an AC disconnect to a condenser typically requires support or securing.Here's why and the relevant code references: NEC Article 356.30 Securing and Supporting

This section is the primary guide for installing LFNC. It states that LFNC must be secured and supported by one of the following means:

(1) Secured

Securely fastened in place by an approved means within 12 inches (300 mm) of terminations and at intervals not exceeding 3 feet (900 mm).

(2) Not Secured

Where flexibility is necessary after installation, unsecured LFNC shall be permitted where not exceeding 3 feet (900 mm) in length between terminations.

The 3-Foot Exception

While the code does allow unsecured runs of LFNC up to 3 feet where flexibility is necessary after installation, your 6-foot run

exceeds that limit. Why Support Is Important

Supporting the LFNC whip prevents: Strain on the connections at the AC disconnect and the condenser. Damage to the conductors inside the conduit. Sagging, which can create a tripping hazard or aesthetic issues. Vibration and movement, which can loosen connections over time.

How to Support a 6-Foot LFNC Whip

The best practice would be to use appropriate conduit clamps or straps, securing the LFNC to a nearby surface (e.g., wall, framing member, or the condenser unit itself if suitable) at intervals that satisfy 356.30(1). You'll need at least 2 supports, one within 12" of each termination.

Important Considerations



Local Codes

Always check with your local electrical inspector or building department. They may have more stringent requirements or specific interpretations of the NEC.

Manufacturer's Instructions

Refer to the manufacturer's instructions for both the LFNC and the connectors.

Environmental Factors

Consider environmental factors such as wind exposure or potential for physical damage when determining the placement and type of supports.

In summary, for a 6-foot LNFC whip from an AC disconnect to a condenser, you must support or secure it to comply with the NEC and ensure a safe and reliable installation. Flag for review