Thermon VSX-HT Heat Tracing Cables (Self-Regulating, Hazardous Area Certified)

Thermon Heat Trace Cables

Thermon VSX-HT Heat Trace Cables – Trace Heating

Heating Cables

Thermon VSX-HT heat tracing cables provide process temperature maintenance and frost protection to pipework, instrument lines, tanks and drums up to 200° Celsius – with IECEx and ATEX Certification Thermon VSX-HT trace heating cables are suitable for Zone 1 and Zone 2 hazardous areas.

High performance VSX-HT self-regulating heating cables are designed specifically for freeze protection or process temperature maintenance where high maintain temperatures or high temperature exposures are required. VSX-HT is able to withstand the temperature exposures associated with steam purging.

The heat output of VSX-HT cable varies in response to the surrounding temperature by reducing its thermal output with increasing temperature and can be overlapped without temperature upset damage to the cable.
VSX-HT cables are certified for use in ordinary (nonclassified) areas and in potentially explosive atomospheres in accordance with the ATEX Directive and the IEC Ex Scheme.

Thermon VSX-HT Heat Tracing Cable

Thermon VSX-HT Heat Tracing Cable

Thermon VSX-HT Heat Tracing Cables – Specification

Thermon VSX-HT heat trace cable wattages per metre at 10°C – 15, 32, 48 and 64 watts.

  • Nominal Supply Voltage : 230v
  • Maximum Maintain Temperature : 200° Celsius
  • Maximum Continuous Exposure Temperature : Intermittent power-on & off 250°C
  • Minimum Installation Temperature : -60° Celsius
  • Minimum Cable Bend Radius : At -15ºC 10mm ; at -60ºC 32mm
  • T-Rating : VSX-HT 5-2, 10-2 T3 200°C, VSX-HT 15-2, 20-2 T2 230ºC

Thermon VSX-HT self-regulating trace heating cables are designed specifically for applications where high temperatures need to be maintained or high temperature exposure is required e.g steam purging.

thermon vsx-ht ordering information

All cables require a connection kit to comply with approval requirements. Further information on accessories to complete a heater circuit installation can be found in the Thermon Product Index.

Thermon Order Code
230 Vac Nominal
Power Output at 10°C
Watts per Metre
VSX-HT 5-2 15
VSX-HT 10-2 32
VSX-HT 15-2 48
VSX-HT 20-2 64
Heat Tracing Cables - Valves Pumps Flanges

Thermon VSX-HT Heat Trace Cables – shown providing trace heating to i) Valve ii) Pump iii) Flange.

Thermon VSX-HT Heat Trace Cable – Hazardous Area Certifications

FM Approvals

  • Ordinary Locations
  • Hazardous (Classified) Locations


  • Certificate FM 18ATEX0009X
  • In accordance with the ATEX Directive 2014/34/EU


  • International Electrotechnical Commission
  • IEC Certification Scheme for Explosive Atmospheres
  • FMG 18.0002X

VSX-HT has additional hazardous area approvals including:
DNV • Lloyd’s • JIS • CCE/CMRS • GGTN • CSA • TR CU • TR-Fire

ATEX Directive


Trace Heating

Electric Heat Tracing Cables For Hazardous Areas

Thermon VSX-HT Heat Tracing Cables

Thermon video providing an overview of best practices for installing heat trace cables to both industrial and hazardous area location pipework. Video covers heat trace cable selection, testing, inspection and pipework preparation prior to installing cables to pipes, valves, flanges and un-insulated pipe supports.

Thermon Electric Heat Tracing System Using BSX Heating Cables

A complete electric heat tracing system will typically include the following components:

1 Trace Heating Cables – depending on the application and system requirements heat trace cables are available in the following technologies: i) Series Constant Wattage ii) Parallel Constant Wattage iii) Power-Limiting iv) Self-regulating type cables.
2. Power Connection Kit
3. RTD Sensor or Control Thermostat
4. In-line/T-splice Kit (permits two or three heat trace cables to be spliced together)
5. Cable End Termination
6. Fixing Tape (to attach heater cables to pipework)
7. “Electric Heat Tracing” Label (peel-and-stick type self-adhesive warning labels)
8. Thermal Insulation

Should you require Heat Trace System design or installation support please do not hesitate to contact us.

Trace Heating Accessories

The following trace heating ancillary and cable installation components enable the completion of VXS-HT heating cable systems:


Thermon VSX-HT Heat Tracing Cables (Self-Regulating, Hazardous Area Certified) Cable Construction

1.Nickel plated copper bus wires (2.1sqmm)

2. Semiconductive heating matrix and fluoropolymer dielectric insulation

3. Nickel-plated copper braid

4. Fluoropolymer overjacket provides additional protection to cable and braid where exposure to chemicals or corrosives is expected.

Thermon VSX-HT heating cables provide temperature maintenance and frost protection to pipework and mechanical services in all industries – typical applications include heating process pipework, instrument lines and storage tanks to maintain viscosity or prevent frost damage as an integral work-task of plant Winterisation.

Heat Tracing Using Trace Heating Cables

Safety & Site Practice for Heat Trace Systems

• Installation of trace heating cables and systems shall be carried out under the supervision of a qualified person.
• Persons involved in the installation and testing of electric trace heating systems shall be suitably trained in all special techniques required, including: i) the purpose and function of the electrical trace heating system, ii) its associated power supply and control equipment and iii) how to recognize and avoid the hazards associated with its operation and maintenance.
• All personnel shall use all appropriate personal protective equipment (PPE), including protective arc flash clothing, to protect against potential arc and electric shock hazards.
• All personnel shall comply with all applicable safety and health guidelines, including Thermon requirements, the regulations outlined in the NEC and CEC, and EN/IEC/IEEE 60079-30-2 for hazardous areas (as applicable), and any other applicable national and local electric codes.
• During installation, the trace heating system parameters shall be verified. Tests shall be performed in the field and documented in the Installation Report as instructed.

For series constant-watt trace heaters (HTEK, TEK, TESH), do not allow the heating portion of the trace heater cable to touch, cross over, or overlap itself.


Thermon VSX Heat Tracing Cables

Did you know? T&D Exports supports the global oil, gas and petrochem industries with an extensive range of Hazardous Area Electrical, Mechanical, Process & Instrumentation Equipment.

Did you know? T&D are Main Distributors for EXHEAT and suppliers of ATEX Air Heaters.


Data Sheets