Nelson™ Heat Trace Type LT Self-Regulating Heater Cable

Nelson

Nelson™ Heat Trace Type LT Self-Regulating Heater Cable

Nelson

Nelson™ Heat Trace LT Series self-regulating heater cable is ideal for use in maintaining fluid flow under low ambient conditions. LT Series heating cables are available in 120 and 240 voltages and are designed for use in ordinary (unclassified) and hazardous (classified) locations. Typical applications for this product are freeze protection and low watt density process temperature systems such as product pipelines, fire protection, process water, dust suppression systems, lube oil, condensate return and structure anti-icing.

Specifications

Certifications and Compliances
UL Listed, CSA Certified, FM Approved: Hazardous (Classified) Locations
Underwriter's Laboratory
-CB, JT or -J options: Class I, Division 2, Groups A, B, C, D; Class II, Division 2, Groups F, G; Class I, Zone 1, AEx e II. D1- option: Class I, Division 1, Groups B, C, D; Class II, Division 1, Groups E, F, G; Class III
Canadian Standards Association
-CB, -JT or -J options: Class I, Division 2, Groups B, C, D; Class II, Division 2, Groups E, F, G ; Class III, Class I, Zone 2, Group IIB+H2. -J option: Class I, Division 1, Groups B, C, D; Class II, Division 1, Groups E, F, G; Class I, Zone 1, Group IIB,
Factory Mutual
-CB, -JT or -J options: Class I, Division 2, Groups A, B, C, D; Class II, Division 2, Groups F, G; Class III. -J option: Class I, Zone 1 AEx e II; Group IIC. D1- option: Class I, Division 1, Groups B, C, D
Maintain Temperature
65 °C (150 °F)
Maximum Continuous Exposure Temperature
65 °C (150 °F) continuous power on
Maximum Intermittent Exposure Temperature
85 °C (185 °F) 1000 hours cumulative exposure
Temperature Classification (T Code)
T6 +85 °C / T +100 °C
Bus Wire Size
16AWG Copper Conductors
Minimum Installation Temperature
-40 °C (-40 °F)
Minimum Bend Radius
12.0 mm (0.50 in) at -40 °C (-40 °F)
Dimensions
6.2 mm x 12.2 mm (0.244 in x 0.480 in)
Accessories
Connection kits, thermostats, contactors, junction boxes, tape, warning signs, custom control, and monitoring and power panels are available. See catalog pages for details

Features

  • Type LT self-regulating heater cable is a parallel circuit electric heater strip. An irradiation cross-linked conductive polymer core material is extruded over the multi stranded, tin-plated, 16 gauge copper bus wires. The conductive core material increases or decreases its heat output in response to temperature changes. Two jackets provide extra dielectric strength, moisture resistance, and protection from impact and abrasion damage. The inner thermoplastic jacket is extruded over and bonded to the core material. A thermoplastic elastomer overjacket is then extruded over the inner jacket. A stranded tinned copper metal braid is supplied on all heaters. An optional overjacket (fluoropolymer or modified polyolefin) can be specified when the heater cable is to be installed in wet or corrosive environments. The base product is supplied with a tinned copper metal braid that may be used in both general applications and in dry, non-corrosive hazardous (classified) areas.
  • Operating principle: The parallel bus wires apply voltage along the entire length of the heater cable. The conductive core provides an infinite number of parallel conductive paths permitting the cable to be cut to any length in the field with no dead or cold zones developing. The heater cable derives its self-regulating characteristic from the inherent properties of the conductive core material. As the core material temperature increases, the number of conductive paths in the core material decrease, automatically decreasing the heat output. As the temperature decreases, the number of conductive paths increase, causing the heat output to increase. This occurs at every point along the length of the cable, adjusting the power output to the varying conditions along the pipe. The self-regulating effect allows the cable to be overlapped without creating hot spots or burnout. As the cable self-regulates its heat output, it provides for the efficient use of electric power, producing heat only when and where it is needed, and also limiting the maximum sheath temperature.
  • Voltage ratings: 240 Vac products are suitable for use on supply voltages of 208-277 Vac. See catalog pages for details.

Documents & Drawings