6 Jul 2017

Summer is finally starting to heat up here in the northeast. Now seems like a good time to review products that are designed for extreme temperature applications. These applications typically include solar panel installations, refrigerated warehouses or factories and many other locations with extreme high and low temperature conditions.


Any conduit that is intended for high or low temperatures must go through testing to determine safe working limits. Underwriter’s Laboratories (UL) conducts low temperature flexibility, cold bend, cold impact, sunlight resistance as well as and other physical property testing to determine the appropriate operating temperature range for the conduit. Common temperature ratings for Hi-Low temperature liquidtight conduits are a low of -55°C / -67°F to a high of 105°C / 221°F when used in a dry location. For wet or oily conditions, ratings range from a low of 60°C / 140°F and 70°C / 158°F respectively.

Conduit temperature ratings should not be exceeded, and it is important to select conduits that can comfortably handle the high and low temperature requirements of an installation. Operating at or close to maximum or minimum temperature ratings for extended periods of time can shorten service life.

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, as well as high and low temperatures, without cracking or degradation. In refrigerated warehouses or environments with temperature fluctuations, the conduit should be rated for wet locations to compensate for any condensation or moisture build-up that may occur.

AFC Cable offers several products that are suitable for use in high or low temperature situations. The UL listed Hi-Low Temperature Type LFMC (6900 series) has a rugged moisture, sunlight and oil resistant PVC jacket with high and low temperature ratings. Non-UL Extreme Temperature Liquidtight is also available for applications approved by the Authority Having Jurisdiction (AHJ).

Our Renewable Energy Application page has additional information on solar application wiring methods.