AFC’s Hi-Low Temperature LFMC is a high performer in both high and low temperature conditions. Conduits should be carefully selected based on their applications, which can affect performance. Operating temperatures should be taken into consideration when installing in areas that will have extreme high temperatures or low temperatures over extended periods of time. Some examples would be rooftops, solar installations or other areas of direct sunlight. Conduits not suited for these applications may have shortened service life due to degradation of the material.

Thorough testing should be done to ensure these products will meet excessive temperature ratings without degrading. To determine the appropriate operating temperature range for the conduit, testing on low temperature flexibility, cold bend, cold impact, sunlight resistance as well as other physical property testing should be completed.

Hi-Low temperature conduits have additional properties that ensure the protection of the conductors. In solar installations for example, the conduit material must be able to withstand UV radiation from sunlight and high temperatures without cracking or degradation. In refrigerated warehouses or environments with temperature fluctuations, the conduit must withstand low temperatures or temperature fluctuations without impact to the material.

AFC’s Hi-Low Temperature LFMC has a rugged PVC jacket allowing it to be rated for wet locations. This is essential if the conduit is intended for outdoor use and exposure to the elements. Additional wet locations may include warehouses or environments with exposure to condensation, sprinkler systems, and more.

Our renewable energy application page has additional information on solar application wiring methods.

AFC offers Hi-Low Temperature Type LFMC liquidtight in trade sizes ranging from 3/8” to 4” and comes standard in gray, however, additional color options are available upon request. AFC marks the surface of the outer jacket with a legend in compliance with UL® 360.

liquid-tuff-hi-low-lfmc-ul

Features and Benefits

  • Superior temperature ratings
  • Hot dipped zinc galvanized low carbon steel core
  • UL® bonding strip 3/8“ – 11⁄4” for grounding
  • Sunlight resistant
  • Flame retardant PVC jacket – Grey

Applications

  • High temperature use
  • Machine tool wiring applications
  • Ideal for cold climate installations
  • Direct burial and concrete embedment
  • Bond wire for grounding in sizes 3/8“ – 11⁄4” NEC® 250.118(6)
  • Hazardous locations per NEC® 501
  • Site lighting and other outdoor wiring jobs

Construction

The Type Hi-Low Liquidtight Flexible Steel Conduit shall be formed from
a zinc coated galvanized low carbon steel strip having a uniform width and thickness. The construction shall be in accordance with UL® 360. The finished Type Hi-Low LFMC dimensions shall be in accordance with Table 5.1 of UL® 360 which is summarized in Table 3.

Jacket – PVC

A rugged moisture, oil and sunlight resistant polyvinyl chloride (PVC) jacket shall be applied directly over the flexible metal conduit with a wall thickness in accordance with Table 4.1 of UL® 360.

Temperature Rating

  • 105°C/221°F Dry
  • –55°C/–67°F Low temperature
  • 60°C Wet
  • 70°C Oil resistant

References & Ratings

  • UL® 360 File E26540
  • NEC® 250.118(6), 350.60, 390.15, 501.10(B)(2), 502.10(A)(2), 503.10(A)(2), 511.7(A)(1), 620.21 (A)(d), 645.5(D)(2), 680.21, 680.42, 695.6(E) and 695.14(E)
  • Department of Defense UL® 360 adopted on October 1, 1987

Grounding

Permanent circuit ground protection is provided through the continuous bonding strip built into the conduit core in sizes 3/8“ through 11⁄4”. A separate grounding conductor is required by the NEC® for trade sizes 11⁄2″ and larger.

Markings

The surface of the outer jacket shall be clearly marked with a legible print legend in compliance with UL® 360.

Performance Tests

In accordance with UL® 360, the completed LIQUID-TUFF™ Hi-Low Liquidtight Flexible Steel Conduit shall meet all of the performance requirements outlined below.

UL® Performance Tests

  • Resistance and High Current
  • Fault Current
  • Impact
  • Tension
  • Crushing
  • Pipe Stiffness
  • Flexibility
  • Low Temperature Flexibility
  • Zinc Coating
  • Vertical Flame
  • Physical Properties
  • Deformation
  • Mechanical Water Absorption
  • Moisture Penetration
  • Sunlight Resistance
  • Test for Secureness of Fittings
  • Test for Durability of Ink Printing
Product CodeTrade Size (inches)Trade Size (mm)Coil Length (feet)Reel Length (feet)Approx. Weight/ 100 feet (pounds)External Diameter (inches)Over Conduit Over Jacket (min/max) (min/max)Internal Diameter (min/max) inchesBend Radius (inches)
6901-30-003/812100'-250.594/0.6140.690/0.7100.484/0.5042
6902-30-001/216100'-310.732/0.7650.820/0.8400.622/0.6423.25
6902-45-001/216-500'310.732/0.7650.820/0.8400.622/0.6423.25
6902-60-001/216-1000'310.732/0.7650.820/0.8400.622/0.6423.25
6903-30-003/421100'-480.930/0.9601.030/1.0500.820/0.8404.25
6903-45-003/421-500'480.930/0.9601.030/1.0500.820/0.8404.25
6903-60-003/421-1000'480.930/0.9601.030/1.0500.820/0.8404.25
6904-30-00127100'-801.201/1.2261.290/1.3151.041/1.0666.5
6904-41-00127-400'801.201/1.2261.290/1.3151.041/1.0666.5
6905-24-0011/43550'-1051.540/1.5701.630/1.6601.380/1.4108
6906-24-0011/24150'-1101.735/1.7701.865/1.9001.575/1.6009
6907-24-0025350'-1472.180/2.2152.340/2.3752.020/2.04511.12
6908-22-0021/26325'-1722.640/2.6752.840/2.8752.480/2.50514.62
6909-22-0037825'-2003.295/3.3353.460/3.5003.070/3.10017.5
6910-22-0031/29125'-2353.720/3.7893.960/4.0003.500/3.54020
6911-22-00410325'-2564.220/4.2804.460/4.5004.000/4.04024
NOTE: All dimensions and weights are subject to normal manufacturing tolerances. Review NEC® 350.60 and 250.118(6) for grounding requirements.