Thermon RSX15-2: Self-Regulating Heat Cable, 49w/m <65°C
Thermon RSX: Foundation Heating Cable, Self-Regulating
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SKU: product options
  • A low temperature, parallel, self-regulating heat tracing cable.
  • Ideal for frostheave protection of cryogenic storage vessels
  • Cut-to-length parallel circuitry for field fabrication
  • Heat output varies in response to the surrounding conditions along the entire length of a circuit.
  • Operating Voltage: 230/240 VAC
  • Start-Up Temperature: 0-20°C
  • T-rating: T6/T5
  • Certifications/ Approval:
    Thermon RSX 15-2 - certifications

For a detailled quotation, please specify required W/m & quantity in metres, below.

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Minimum power output for substrate temperature of 5°C and operating voltage of 230 Vac.

Applications for Thermon RSX Self-regulating foundation heating cable

Thermon RSX parallel self-regulating heating cables provide frostheave protection of cryogenic storage vessels. RSX heating cables offer the power output needed to maintain the substrate of cryogenic tanks above freezing temperatures.

With cut-to-length parallel circuitry, RSX cables can be field fabricated, eliminating the need for specific circuit lengths to be provided for the application.

The heat output of RSX cable varies in response to the surrounding conditions along the entire length of a circuit which make it ideally suited for foundation heating applications where the heat demand may vary.

RSX is approved for use in ordinary (nonclassified) areas, hazardous (classified) areas and are certified to the ATEX directive for use in Category 2 and 3 (Zone 1 and 2) classified areas..

Certifications/ Approvals

CE certificateCertificate KEMA 07 ATEX0179 in accordance
with the EU ATEX Directive 94/9/EC
International Electrotechnical CommissionInternational Electrotechnical Commission
IEC Certification Scheme for Explosive Atmospheres
KEM 07.0052
Factory Mutual ResearchFM Approvals
Hazardous (Classified) Locations
Underwriters LaboratoriesUnderwriters Laboratories Inc.
Hazardous (Classified) Locations

ATEX Certification is to EN 60079-0: 2012 and EN 60079-30-1: 2007
IECEx certification is to IEC 60079-0: 2011 and IEC 60079-30-1: 2007
RSX cable has additional hazardous area approvals including: • CCE/CMRS • CSA

Thermon RSX Foundation Heating: Self-regulating heating cable, product specifications

  1. Nickel-plated copper bus wires (14 AWG)
  2. Radiation cross-linked semiconductive heating matrix
  3. Radiation cross-linked dielectric insulation
  4. Tinned copper braid
  5. Fluoropolymer overjacket
  • Minimum power output in conduit¹
    RSX10-2: 26 W/m
    RSX 15-2: 35 W/m
  • Available nominal supply voltage²: 208-240 Vac
  • Minimum installation temperature: -60°C
  • Maximum circuit length
    RSX 10-2: 180m
    RSX 15-2: 120 m
  • Minimum bend radius
    @ -15°C: 10 mm
    @ -60°C: 32 mm
  • Pull strength: 500N
  • Weight: 0.191kg/m
  • T-rating²
    9, 15, 25 W/m: T6 85°C
    32 W/m: T5 100°C
    Based on stabilised design³: T6 85°C


¹Minimum power output for substrate temperature of 5°C (41°F) and operating voltage of 230 Vac.
²For other voltages up to 277 Vac, contact us.

Conventional Foundation Heating System

Foundation Heating System by Thermon

Circuit Breaker Sizing and Type¹

Maximum current draws based on start-up temperatures are shown below.

Circuit breaker sizing should be based on local regulations. Ground-fault protection of equipment should be provided for each branch circuit supplying electric heating equipment.

Maximum Current Draw
230/240 Vac
RSX 10-2
RSX 15-2


¹Circuit length is dependent on ampacity and characteristics of the circuit breaker.
²Current draw values are based on dry conduit conditions. For wet conduit
conditions, contact Thermon.

Temperature Control

From both energy saving and operational standpoints, the heating system should include an effective and versatile temperature control system. Contact us for recommendations.

Power & End Termination Kit

Thermon Power & end termination kit

FHT 1-R-10 contains components to fabricate 10 power connections and 10 end terminations for RSX foundation heating cable. (Components for a single circuit shown.)

Kit includes:

  • (10) Ring terminals
  • (10) ET End caps
  • (10) TBX Power connection boots
  • (10) 3'' (76 mm) Polyolefin shrink tubes
  • (10) 4-3/4'' (121 mm) Polyolefin shrink tubes
  • (1) Rolls of Teflon® tape
  • (3) Rolls of mastic tape
  • (10) RTV silicone tubes
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