Technical Foundation
What Is a Liquid Tight Conduit?
Liquid tight flexible conduit (often called sealtight or LFMC/LFNC by its UL type designation) protects electrical conductors while sealing out liquid ingress, distinguishing it from standard flexible metal conduit which is not rated for wet or washdown exposure. Metallic versions use a spiral-wound steel or aluminum core wrapped in an extruded, bonded polymer jacket, combining the mechanical protection of metal conduit with a continuous liquid-tight seal; nonmetallic versions use a corrugated PVC or polymer body throughout, avoiding the corrosion risk of metal in highly corrosive or wet environments.
Trade size (matched to standard conduit sizing, from 3/8 in through several inches) must be selected with enough internal fill capacity for the conductor count and gauge being routed, per NEC conduit fill tables, not just to fit the connection point. Fittings are equally application-specific — liquid tight connectors use a compression or crimp seal against the conduit jacket, and using a standard (non-liquid-tight) fitting on liquid tight conduit defeats the seal at the connection point even if the conduit itself is rated properly.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Conduit Type | LFMC (metallic) vs. LFNC (nonmetallic) | Metallic offers grounding continuity and mechanical protection; nonmetallic avoids corrosion in harsh chemical exposure |
| Trade Size | 3/8 in through 4 in, standard sizing | Must provide adequate conductor fill per NEC tables, not just fit the connection points |
| Jacket Material | PVC, polyethylene, thermoplastic | Determines chemical, oil and UV resistance for the specific washdown or outdoor environment |
| Temperature Rating | Printed on jacket, varies by product | Must exceed the maximum ambient and conductor operating temperature at the installation |
| Fitting Compatibility | Liquid tight-specific compression/crimp fittings | Standard non-liquid-tight fittings break the seal at connection points even on rated conduit |
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Applications
Where Liquid Tight Conduit Get Used
Liquid tight conduit is specified anywhere wiring must be routed through wet, washdown, outdoor, or corrosive environments where standard flexible conduit would allow moisture ingress.
Food & Beverage Processing
Wiring motor and control connections in washdown areas where liquid tight conduit and fittings maintain the seal against daily hosing.
Outdoor Equipment & Machinery
Protecting conductor runs to outdoor motors, pumps and control panels exposed to rain and weather.
Wastewater Treatment
Corrosion-resistant nonmetallic liquid tight conduit routing power in chemically aggressive treatment environments.
Automotive Manufacturing & Robotics
Flexible liquid tight conduit accommodating vibration and movement at robotic and conveyor motor connections.
Agricultural & Livestock Facilities
Liquid tight conduit protecting wiring in wash-down barns and outdoor equipment exposed to moisture and corrosive waste.
FAQ
Liquid Tight Conduit Questions, Answered
What's the difference between liquid tight conduit and standard flexible metal conduit?
Standard flexible metal conduit (FMC) has gaps between its spiral windings and is not sealed against moisture. Liquid tight flexible conduit adds a continuous, bonded polymer jacket over that spiral core (or uses a fully nonmetallic corrugated body), sealing out water, oil and washdown spray that would otherwise reach the conductors inside.
Should I choose metallic or nonmetallic liquid tight conduit?
Metallic liquid tight conduit (LFMC) provides mechanical protection and can serve as an equipment grounding path where code permits, making it common in general industrial wet locations. Nonmetallic liquid tight conduit (LFNC) avoids the corrosion risk of a metal core entirely, which matters in highly corrosive chemical or wastewater environments where even a jacketed metal core could eventually corrode if the jacket is compromised.
Can I use standard conduit fittings with liquid tight conduit?
No — standard fittings don't seal against the conduit's jacket, which breaks the liquid-tight protection right at the connection point even though the conduit run itself is rated for wet locations. Liquid tight-specific compression or crimp fittings are required to maintain the seal all the way to the box or enclosure.
How do I size liquid tight conduit for the number of conductors I need to run?
Conduit trade size must be selected using NEC conduit fill tables, which specify maximum conductor fill percentage based on conductor gauge, insulation type, and conduit trade size — sizing to just physically fit the conductors without checking fill percentage risks overheating and makes future conductor additions impossible.
Is liquid tight conduit rated for direct sun and outdoor UV exposure?
Rating varies by specific product and jacket material — check the conduit's printed temperature and UV rating rather than assuming, since not all liquid tight conduit jacket formulations are rated for prolonged direct sunlight exposure without degrading.
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