Installing THHN cable in cold weather
When the weather is cold, you can have problems not just with your heating bills and skin, but also with your cables. For example, the THHN cable is easily vulnerable to deterioration due to cold weather.
THHN cable is Thermoplastic, High-Heat Resistance, Nylon-Coated, therefore the name- THHN. Though it is versatile cable and does not fall under any specific application category, it is mostly used under Hook-up wire class.
THHN cable comes in a variety of strengths. And since it is made from thermoplastic material, it is easy to heat and cool this wire many times to change its shape. But there is a limit to the number of times this wire can stand heating and cooling. It has its lower and higher temperature limits and if the temperature changes cross this range, this wire can become unstable. Temperature range depends upon manufacturers.
When the THHN cable comes with ‘High Heat’ rating, it means that this wire can be used in high temperature scenarios. These wires come with various specifications, which determine the specific applications where these can be used. For example, “Nylon coated” means that a certain thermoplastic material is used in this wire.
Coming to installation of the THHN cable in the cold weather, there are some simple guidelines that you should follow. Keep this cable indoors, and not in the outdoor harsh environment. Generally, a temperature of 65°F works well.
If keeping the cable indoors is not possible, bring it inside for at least 24 hours, before you install it.
If the outside temperature is below 14°F, then do not install the THHN cable.
While installing the cable, take care that it is not dropped on the floor, as these impacts can cause cracks in the stiff cable material.
Make sure you do not bend the cable too much, because it can cause the cold and stiff cable to break.
Once you have installed it, this cable will work properly in environments with temperature higher than 14°F.