Chromalox SRP Self-Regulating Trace Heating Cable (Process Temperature – 230°F 110°C)

Chromalox SRP Trace Heating Cable


Frost Protection Trace Heating Cables

Trace Heating cable

frost protection

Chromalox SRP self-regulating trace heating cables provide process temperature maintenance and frost protection to pipework, instrument lines, tanks and drums.

With UL Listing and CSA, ATEX, IECEx and FM certification Chromalox SRP heat trace cables are suitable for use in hazardous areas.

Heating Cable Features

  • Energy efficient SRP self regulating trace heating cables requires less energy as less heat is required
  • Simple to install heat trace cable and can be cut to any length (see max circuit length)
  • SRP trace heating cables offer low installation costs and require less maintenance minimising downtime
  • Heating cables can be single overlapped without burnout, which simplifies heat tracing of in-line process equipment such as valves, elbows and pumps
  • Chromalox U-Series Connection Kits reduce installation time


Chromalox SRP heat trace cable is available in 5, 10 and 15 w/ft. This range of self-regulating trace heating cables increase power output as temperatures falls to provide reliable frost protection and temperature maintenance of industrial process and water pipework.

  • Approximate Cable Size : 0.47″ W x 0.20″ H
  • Maximum Maintain Temperature : 110° Celsius
  • Maximum Continuous Exposure Temperature : Power Off 135° Celsius
  • Available Models (Voltages) : 120 and 208 – 277V
  • Minimum Cable Bend Radius : 1-1/8″
  • Trace Heating Cable Circuit Lengths : Up to 750 feet


Chromalox Cable Part Number  Trace Heating Cable Description Voltage W/ft
387161 Chromalox SRP 5-1C 120V 5
387217 Chromalox SRP 5-2C 240V
387188 Chromalox SRP 5-1CT 120V
387225 Chromalox SRP 5-2CT 240V
387102 Chromalox SRP 10-1C 120V 10
387170 Chromalox SRP 10-2C 240V
387129 Chromalox SRP 10-1CT 120V
387196 Chromalox SRP 10-2CT 240V
387065 Chromalox SRP 15-1C 120V 15
387110 Chromalox SRP 15-2C 240V
387073 Chromalox SRP 15-1CT 120V
387137 Chromalox SRP 15-2CT 240V

Chromalox SRP Thermal Output Ratings On Insulated Metal Pipe

Output Wattage at Alternate Voltages (W/Ft.)

Chromalox Part Number 208V % Change In Output 220V % Change In Output 277V % Change In Output
Chromalox SRP 5 3.85 -20 4.25 -13 6.45 +15
Chromalox SRP 10 8.3 -18 8.80 -10 12.50 +13
Chromalox SRP 15 12.75 -14 13.50 -9 18.45 +12

Chromalox frost protection CABLE


Chromalox SRP Self-Regulating Trace Heating Cable - Construction


  • A Twin 16 AWG Copper Buss Wires are able to provide reliable electrical current capability.
  • B Semiconductive Polymer Core Matrix is the ‘self regulating component of the cable and it’s electrical resistance varies with temperature.
  • C Fluoropolymer Jacket is flame retardant and electrically insulates the matric and buss wires and provides corrosion resistance.
  • D Tinned Copper Braid that provides additional mechanical protection in any environment, and a positive ground path.
  • E High Temperature Fluoropolymer Overjacket is a corrosion resistant, flame retardant overjacket is highly effective in many environments.


Factory Mutual (FM) approved for ordinary areas. FM, ATEX and IECEx approved for hazardous (classified) areas when used with U Series and DL accessories.

Hazardous Area Heating Cables

Hazardous Area Heating Cables

FM Approved

  • Class I, Division 2, Groups B, C, D (Gases, vapours)
  • Class II, Division 2 Groups F, G (Combustible dust)
  • Class III, Division 2 (Easily ignitable fibres and fillings)
  • Class I, Zone 1, AEx e II
  • 3,5,8 and 10 Watt Rated T4 Temperature Class

ATEX Approved

  • CE 1725 IIG Ex e IIC T4 Gb Ta -40˚C to 70˚C

IECEx Approved

  • FMG 17.0015x Ex e IIC T4 Gb Ta -40˚C to 70˚C

➡ Chris Myers, Product Manager at Chromalox, explains about their heat trace cables and product offering including self regulating trace heating cable.

Industrial Electrical Heating Specialists

We can specify and supply from stock an extensive range of Electrical Heating Equipment for industrial and process heating applications -this includes temperature maintenance and frost protection (Winterisation) products for pipework, valves, IBC’s, drums, hoses, tanks and vessels. We produce custom silicone heaters for rapid and high temperature heat-up of complex shapes and surfaces – from concept, design to the delivery of standard or bespoke heaters on the shortest lead times. From the largest UK heat tracing cable stocks we deliver Electric Trace Heating Systems for pipework frost protection, ramp heating, roof/gutter snow melting and de-icing – enquire about our in-house design service.

Data Sheets