Resistance Heating Cables for Industrial Heat Tracing
Resistance Heating Cables
Resistance heating cables generate heat through the electrical resistance of the heating conductor. Depending on construction, they can be used for engineered circuits, longer runs, higher temperatures or applications requiring a defined electrical output.
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Series and parallel systems
For series resistance heaters, conductor resistance, length and voltage determine circuit power. Parallel systems use a different electrical construction and, depending …
For series resistance heaters, conductor resistance, length and voltage determine circuit power. Parallel systems use a different electrical construction and, depending on product design, can provide a defined wattage per unit length. Selection must match the application.
In series cables, resistance, length and voltage together determine output. Parallel systems use a different electrical principle and have their own cutting rules. These differences matter for selection and replacement: similar diameter or output per metre does not make two cables interchangeable.
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Electrical design
Series systems require required power, circuit length, supply voltage, permissible sheath temperature and electrical resistance to be engineered together. Changing …
Series systems require required power, circuit length, supply voltage, permissible sheath temperature and electrical resistance to be engineered together. Changing length later can significantly change circuit output.
For a specified length, we assess the output at the intended supply and whether sheath temperature suits the application. Changes to an assembled length or supply voltage require reassessment. Connections and cold leads must match electrical loading, ambient conditions and installation location.
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Control and protection
Resistance systems require control and electrical protection appropriate to the application. High-temperature or hazardous-area duties can require independent …
Resistance systems require control and electrical protection appropriate to the application. High-temperature or hazardous-area duties can require independent temperature limitation.
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Distinguish series and parallel constructions
For a simple series heater with defined resistance R and applied voltage U, the approximate relationship is P = U²/R. Length and resistance per metre determine total …
For a simple series heater with defined resistance R and applied voltage U, the approximate relationship is P = U²/R. Length and resistance per metre determine total resistance. Changing length therefore changes total output and output per metre; the original W/m figure cannot simply be retained.
Parallel constant-wattage systems have a different electrical construction and may have defined cutting zones. Calculation, fabrication and testing follow the actual cable type. The full type designation and original design are therefore more useful than the broad term resistance heating cable.
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Frequently asked questions
How is resistance heat tracing different from self-regulating cable? Resistance systems have a different power characteristic and are often more dependent on electrical …
How is resistance heat tracing different from self-regulating cable?
Resistance systems have a different power characteristic and are often more dependent on electrical circuit design and geometry; self-regulating cables change local output with temperature.
Can series resistance cable be cut shorter on site?
Normally not without recalculation because circuit length changes electrical resistance and therefore heater power.
When is resistance heating useful?
It can be suitable for higher temperatures, long circuits, defined power duties or custom geometries, depending on the specific heater design.
Are series and parallel cables handled in the same way?
No. Construction, output calculation, permissible lengths and cutting rules differ. Follow the documentation for the specific product.
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Related topics
High-temperature heating → Temperature maintenance → Heat-up → Controls and monitoring → Worldwide installation → Heat loss and insulation →
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Typical applications
Resistance heating cables can be used for process temperature maintenance, high-temperature duties, long circuits, tanks, piping and custom equipment.
Resistance heating cables can be used for process temperature maintenance, high-temperature duties, long circuits, tanks, piping and custom equipment.
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Materials and environment
Insulation and jacket materials are selected around temperature, chemical exposure, moisture and mechanical conditions.
Insulation and jacket materials are selected around temperature, chemical exposure, moisture and mechanical conditions.
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Length changes require recalculation
In a series resistance circuit, length, resistance, voltage and power are directly linked. Shortening the heating conductor without recalculation can change the power to …
In a series resistance circuit, length, resistance, voltage and power are directly linked. Shortening the heating conductor without recalculation can change the power to an unacceptable level. Parallel systems use a different arrangement and may have defined cutting zones. The cable construction and design data are therefore established before fabrication. Any site adjustment starts with an engineering review, rather than cutting away what appears to be excess cable.
Agree the brand and budget with us: our engineering is independent of a single manufacturer. Depending on suitability, we select Pro Therm own-brand materials or products from eltherm, BARTEC, RAYCHEM/Chemelex and Thermon. Tell us your preferred construction and budget range.
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Standards and technical basis
Our knowledge section explains how the standards relate to the heating task, product selection and project design. Open the standards overview →
Our knowledge section explains how the standards relate to the heating task, product selection and project design.
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Specify a resistance heating cable
Send the heating length, total or linear output, supply, temperatures and existing type information. For replacement, we also need the previous unit's data; length alone …
Send the heating length, total or linear output, supply, temperatures and existing type information. For replacement, we also need the previous unit's data; length alone is not sufficient for selection.
Request resistance-heater engineering →
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References & projects
Explore our project reports for electric heat tracing and frost heave protection. View references & projects →
Explore our project reports for electric heat tracing and frost heave protection.
Typical applications
Resistance heating cables can be used for process temperature maintenance, high-temperature duties, long circuits, tanks, piping and custom equipment.
Electrical design
Series systems require required power, circuit length, supply voltage, permissible sheath temperature and electrical resistance to be engineered together. Changing length later can significantly change circuit output.
For a specified length, we assess the output at the intended supply and whether sheath temperature suits the application. Changes to an assembled length or supply voltage require reassessment. Connections and cold leads must match electrical loading, ambient conditions and installation location.
Standards reference (checked 14 October 2026): IEC/IEEE 62395-2:2024 addresses system design, installation, maintenance and repair outside hazardous areas. DIN EN 62395-2:2014-12 remains the current German national edition. Record the agreed edition in the project documentation.
Materials and environment
Insulation and jacket materials are selected around temperature, chemical exposure, moisture and mechanical conditions.
Control and protection
Resistance systems require control and electrical protection appropriate to the application. High-temperature or hazardous-area duties can require independent temperature limitation.
Standards reference (checked 14 October 2026): DIN EN 60519-10:2014-01 remains the current German standard for safety of industrial and commercial resistance trace heating. Its application is coordinated with the selected heating system and electrical-installation requirements.
Length changes require recalculation
In a series resistance circuit, length, resistance, voltage and power are directly linked. Shortening the heating conductor without recalculation can change the power to an unacceptable level. Parallel systems use a different arrangement and may have defined cutting zones. The cable construction and design data are therefore established before fabrication. Any site adjustment starts with an engineering review, rather than cutting away what appears to be excess cable.
Agree the brand and budget with us: our engineering is independent of a single manufacturer. Depending on suitability, we select Pro Therm own-brand materials or products from eltherm, BARTEC, RAYCHEM/Chemelex and Thermon. Tell us your preferred construction and budget range.
Standards reference (checked 14 October 2026): For heating cables and assemblies outside hazardous areas, IEC/IEEE 62395-1:2024 is the international reference for general requirements and testing. Germany still lists DIN EN 62395-1:2014-10 as the current national edition.