High Temperature Liquid Tight Flexible Conduit
It is a tough, heat-resistant tubing, it is designed to protect wires and cables in extreme conditions. It stays flexible even under high heat and keeps out liquids, oils, and chemicals. It is used for industrial machinery, automotive systems, and harsh environments.
Material
To illustrate the material variations, consider the following table comparing high-temperature LFNC (non-metallic) and LFMC (metallic) options based on available data:
|
Material Type |
Main Material |
Flexibility |
Temperature Range (°C) |
Common Applications |
Notes |
|
High-Temperature LFNC (Type B) |
PVC |
High |
-40 to 105 |
HVAC, outdoor lighting, direct burial |
Smooth inner/outer surface, cost-effective, high-temperature grade PVC |
|
High-Temperature LFMC |
Steel |
High |
-50 to 105 (dry), 75 (oil) |
Offshore rigs, rail transit, steelworks |
Core is steel, with TPR or high-temperature PVC jacket for liquid tightness |
This table highlights that for non-metallic high-temperature liquid tight flexible conduits, PVC is the main material, while for metallic types, steel is the main material, with the jacket providing additional properties.
Size
|
Trade Size (Inches) |
Internal Diameter (Approx., Inches) |
Max Wires (14 AWG, THWN) |
Typical Applications |
Notes |
|
1/2 |
0.622 |
13 |
Small HVAC units, lighting fixtures |
Tight fit for larger cables, common in residential |
|
3/4 |
0.824 |
22 |
Residential HVAC, outdoor lighting |
Versatile, preferred for ease of pulling |
|
1 |
1.049 |
35 |
Larger HVAC, commercial applications |
More capacity, less common in residential |
|
1-1/2 |
1.610 |
84 |
Industrial, heavy-duty applications |
Less frequent, higher cost |
|
2 |
2.067 |
138 |
Industrial, large-scale installations |
Rare in residential, used for high loads |
Usage of High Temperature Liquid Tight Flexible Conduit
|
Application |
Typical Temperature Range (°C) |
Environment |
Notes |
|
HVAC Systems (Air Conditioners) |
Up to 60-80 |
Indoor/Outdoor, Near Heat |
Common in residential, handles equipment heat |
|
Industrial High-Temperature Areas |
Up to 105 |
Factories, Foundries |
Chemical, steel production, extreme heat |
|
Outdoors in Hot Climates |
Up to 50-70 |
Rooftops, Deserts |
UV exposure, high ambient temperatures |
|
Direct Burial in Hot Soil |
Up to 40-60 |
Underground, Hot Regions |
Protects from moisture and heat |
|
High-Current Conductor Applications |
Up to 105 |
Industrial, Heavy Duty |
Handles conductor heat, high electrical load |
Structure
|
Type |
Inner Surface |
Reinforcement |
Flexibility |
Notes |
|
LFNC-A |
Smooth |
Reinforcement layers between core and cover |
High |
Layered construction, more complex |
|
LFNC-B |
Smooth |
Spiral of rigid PVC in wall |
High |
Integral reinforcement, common for high temp |
|
LFNC-C |
Corrugated |
No integral reinforcement |
High |
Lighter, less crush-resistant |
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