nVent RAYCHEM VPL is a family of power-limiting heat trace cables designed for pipe heat tracing in industrial applications. VPL can be used for pipe freeze protection and process temperature maintenance applications requiring high power output and/or high temperature exposure up to 455°F (235°C). RAYCHEM VPL cables can withstand routine steam purges and temperature excursions to 500°F (260°C) with power off.

Power-limiting cables are parallel heaters formed by a coiled resistor alloy heating element wrapped around two parallel bus wires. The distance between conductor contact points forms the heating zone length. This parallel construction allows the cable to be cut to length and terminated on site. The power output of RAYCHEM VPL heat trace cables decreases with increasing temperature. The relatively flat power temperature curve of VPL ensures a low start-up current and high output at elevated temperatures.

Additional Product Information:

  1. RAYCHEM VPL heat trace cables are approved for use in non-hazardous and hazardous locations.
  2. RAYCHEM VPL heat trace cables can be overlapped.
  3. RAYCHEM VPL heat trace cables meet the requirements of the U.S. National Electrical Code and the Canadian Electrical Code.

Industries Served:
Chemical and Pharmaceutical
Food and Beverage
Oil and Gas

Technical Specifications

  1. Power-limiting heating cable shall use a metallic heating element that varies its power output relative to the temperature of the surface of the pipe or the vessel. The cable shall be a parallel-zoned heating cable with a positive temperature coefficient heating element spirally wound around a flexible glass fiber core. The cable shall be designed such that it can be crossed over itself one time and cut to length in the field.
  2. A ground-fault protection device set at 30 mA, with a nominal 100-ms response time, shall be used to protect each circuit.
  3. Maximum heating cable sheath temperature, per either the FM or CSA method of calculation, shall be submitted with the bid or design for all Division 1 and Division 2 applications.
  4. The power-limiting heating cable shall have 12 AWG copper bus wires.
  5. A warranty against manufacturing defects for a period of 10 years shall be available.
  6. All cables shall be capable of passing a 2.5 kV dielectric test for one minute (ASTM 2633) after undergoing a 0.5 kg-m impact (BS 6351, Part 1, 8.1.10).
  7. The heating cable shall have continuous power on exposure (maintain) capability of 300°F (150°C) to 455°F (235°C), depending on power output required, and continuous power off exposure capability up to 500°F (260°C).

For detailed product specifications, please refer to the product datasheet.


Warranty Information

Warranty Extension Available

Connection and Protection