1. Copper core conductor: 7×0.50, 19×0.32, 19×0.41
2. Conductive plastic layer: Ordinary PTC, flame-retardant PTC, fluorinated PTC
3. Insulation layer: Modified polyolefin, flame-retardant polyolefin, fluorinated polyolefin, perfluorinated material
4. Shielding layer: Tinned soft round copper wire, coverage density 80%
5. Jacket layer: Modified polyolefin, flame-retardant polyolefin, fluorinated polyolefin, perfluorinated material
3. Installation temperature: Minimum: -5°C
4. Thermal stability: After 300 cycles between 15°C and 99°C, the cable heat output remains above 90%.
5. Bending radius: 25.4mm at 20°C room temperature, 35.0mm at -30°C low temperature
6. Insulation resistance: For a cable length of 100m at an ambient temperature of 75°C, measured with a 2,500VDC megger for 1 minute, insulation resistance (between conductor and shield) minimum value is 120MΩ.
7. Starting current (10°C): 0.4A per meter
8. For installation and use, please refer to the precautions section
9. Maximum usable length: not exceeding 100 meters
Classification by Temperature
According to the composition of the polymer PTC material, self-regulating heating cables are divided into low-temperature and high-temperature types.
Common types on the market include polyolefin-based heating cables with a 65°C temperature rating and fluoropolymer-based heating cables with 110°C and 150°C ratings. The temperature rating here is defined as the maximum ambient temperature (MAXIMUM PIPE MAINTENANCE TEMPERATURE) at which the heating cable can be effectively applied. It can also be understood as the highest ambient temperature at which the cable can operate stably for a long time and produce effective heating power output. Exceeding the specified temperature rating, on one hand, results in increased resistance, low output power, and low actual heating efficiency. On the other hand, prolonged use at high temperatures degrades or attenuates cable performance, such as PTC characteristics and heating power, reducing the cable's service life and operational reliability. However, short-term intermittent exposure to temperatures exceeding the rating is permissible. Therefore, in addition to the above temperature ratings, self-regulating heating cables have another temperature rating. For example, for a 65°C rated cable, this temperature is 85°C; for a 110°C rated cable, it is 130°C; and for a 150°C cable, it is 230°C. However, at this point, the effective output power of the cable is close to zero.
Due to the scarcity of relevant literature, many people have a misunderstanding about the temperature rating of self-regulating heating cables, believing it refers to the maximum surface temperature of the heating cable. Therefore, temperature ratings such as 45, 65, 85, and 105°C have appeared, etc.
