Differences between the use of self-regulating cable and resistive cable
The differences between samrega and resistiva!
Industrial electric heating systems involve the use of two types of heating cables – self-regulating and resistive.
In which case which type of cable is better, feasible and profitable to use?
Each of them has both strengths and weaknesses when used, for example, self-regulating heating cable is not advisable to use when heating long pipelines and large vessels, in this case it is more favourable to use a resistive heating cable.
A self-regulating cable has a large starting current when voltage is applied to it (switching on), which can be up to 5 times, or even 10 times, the rated (declared) current. A resistive cable does not have such a starting current, it can have a starting current of no more than 20% above the rated (declared) current in certain cases. This parameter influences the selection of the starting equipment in the control cabinet of the electric heating system.
Self-regulating heating cables can be installed on site and cut “on site” in multiples of a metre, resistive heating cables do not have this advantage, they are cut according to a pre-determined (design) calculation. Resistive heating cables cut “on site” at the discretion of the installers are bound to fail (burn out) or fail to fulfil their intended purpose.
Self-regulating heating cables are not afraid of crossing each other when installed on the object, which can not be said about resistive – when crossing each other they are sure to burn at the intersection and the whole section of heating cable will stop working.
The outer sheath of the heating cables can also be mentioned. Self-regulating heating cables are manufactured using only two types of outer sheath – polyolefin and fluoropolymer, resistive industrial heating cables are produced, as a rule, with an outer sheath made of Teflon (fluoroplastic or as it is called by manufacturers – PTFE). Cables with polyolefin outer jacket can be used for non-corrosive areas, fluoropolymer outer jacket is designed for use in corrosive environments. The outer sheath of Teflon resistive cables can be used both in aggressive and non-corrosive environments.
The differences between samrega and resistiva!
Industrial electric heating systems involve the use of two types of heating cables – self-regulating and resistive.
In which case which type of cable is better, feasible and profitable to use?
Each of them has both strengths and weaknesses when used, for example, self-regulating heating cable is not advisable to use when heating long pipelines and large vessels, in this case it is more favourable to use a resistive heating cable.
A self-regulating cable has a large starting current when voltage is applied to it (switching on), which can be up to 5 times, or even 10 times, the rated (declared) current. A resistive cable does not have such a starting current, it can have a starting current of no more than 20% above the rated (declared) current in certain cases. This parameter influences the selection of the starting equipment in the control cabinet of the electric heating system.
Self-regulating heating cables can be installed on site and cut “on site” in multiples of a metre, resistive heating cables do not have this advantage, they are cut according to a pre-determined (design) calculation. Resistive heating cables cut “on site” at the discretion of the installers are bound to fail (burn out) or fail to fulfil their intended purpose.
Self-regulating heating cables are not afraid of crossing each other when installed on the object, which can not be said about resistive – when crossing each other they are sure to burn at the intersection and the whole section of heating cable will stop working.
The outer sheath of the heating cables can also be mentioned. Self-regulating heating cables are manufactured using only two types of outer sheath – polyolefin and fluoropolymer, resistive industrial heating cables are produced, as a rule, with an outer sheath made of Teflon (fluoroplastic or as it is called by manufacturers – PTFE). Cables with polyolefin outer jacket can be used for non-corrosive areas, fluoropolymer outer jacket is designed for use in corrosive environments. The outer sheath of Teflon resistive cables can be used both in aggressive and non-corrosive environments.
