NELSON™
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SELF-REGULATING HEATERS
APPLICATION INFORMATION
TYPE CLT
Description:
Nelson Type CLT selfregulating heater cable is a
parallel circuit electric heater
strip. An irradiation crosslinked conductive polymer
core material is extruded over
the multi-stranded, tin-plated,
18-guage copper bus wires.
The conductive core material
increases or decreases its heat
output in response to
temperature changes. A
thermoplastic elastomer
dielectric jacket is then
extruded over the conductive
core. A copper braid is
installed over this jacket
providing a continuous ground
path. A UV stabilized
thermoplastic elastomer
overjacket is provided to cover
the braid for wet applications
and exposure to the sun.
Standard Overjacket
Standard Metal Braid
Stranded Copper Conductors
Self Regulating Conductive Core
• Thermoplastic Elastomer Jacket
Principle of Operation:
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 selfregulating 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 decreases, automatically
decreasing the heat output. As the
temperature decreases, the number
of conductive paths increases,
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 it 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 surface temperature.
Application:
Nelson's Type CLT self-regulating
heater cable is ideal for use in
maintaining fluid flow under low
ambient conditions. Freeze
protection and low watt density
process temperature systems such
as pipelines, fire protection, process
water, dust suppression systems,
hot water and structure anti-icing
are typical applications for this
product. For other than metal pipe
heating, see appropriate application
guide. The base product is
supplied with a copper metal braid
with a thermoplastic elastomer
overjacket for wet applications,
exposure to the sun, and where
mechanical abuse is a problem.
315-SA-040
February 2009
NELSON™
PIPING FREEZE PROTECTION
APPLICATION INFORMATION
TYPE CLT
Cable Selection @ 0°F Minimum Ambient Temperature
Application Design Conditions
Maintain Temperature
Insulation Type Fiberglass
Wind Speed 20 MPH
Safety Factor 10%
Heater Attachment GT-6 Fiberglass Tape
The information in the tables below represents the wattage of cable necessary to meet the Design Conditions. CLT3 = 3,
CLT5 = 5, CLT8 = 8. If a single pass of cable does not satisfy the heat loss requirement, then multiple passes are shown.
Example: 5(2) (two passes of 5 watt product).
40
°
F
Metallic Pipe Applications *
208 VAC
Pipe Size (in inches) Insulation
Thickness
0.5” 3 3 5 5 5 8 8 8 8(2) 8(2)
1.0” 3 3 3 3 5 5 5 5 8 8
1.5” 3 3 3 3 3 3 5 5 5 8
2.0” 3 3 3 3 3 3 3 5 5 5
0.50 0.75 1.00 1.50 2.00 2.50 3.00 4.00 6.00 8.00
120/240 VAC
Pipe Size (in inches) Insulation
Thickness
0.5” 3 3 3 5 5 5 8 8 5(2) 8(2)
1.0” 3 3 3 3 3 3 5 5 8 8
1.5” 3 3 3 3 3 3 3 3 5 5
2.0” 3 3 3 3 3 3 3 3 5 5
0.50 0.75 1.00 1.50 2.00 2.50 3.00 4.00 6.00 8.00
277 VAC @
Pipe Size (in inches) Insulation
Thickness
0.5” 3 3 3 3 3 5 5 8 5(2) 8(2)
1.0” 3 3 3 3 3 3 3 3 5 5
1.5” 3 3 3 3 3 3 3 3 3 5
2.0” 3 3 3 3 3 3 3 3 3 3
0.50 0.75 1.00 1.50 2.00 2.50 3.00 4.00 6.00 8.00
Non-Metallic Pipe Applications *
208 VAC
Pipe Size (in inches) Insulation
Thickness
0.5” 5 5 5 8 8 5(2) 8(2) 8(2)
1.0” 3 3 5 5 5 8 8 8 8(2) 8(2)
1.5” 3 3 3 5 5 5 5 8 8 8(2)
2.0” 3 3 3 3 5 5 5 5 8 8
120/240 VAC
Thickness
0.5” 3 5 5 8 8 8 5(2) 8(2)
1.0” 3 3 3 5 5 5 8 8 5(2) 8(2)
1.5” 3 3 3 3 3 5 5 5 8 5(2)
2.0” 3 3 3 3 3 3 3 5 8 8
277 VAC
Thickness
0.5” 3 3 3 5 8 8 5(2) 5(2) 8(2)
1.0” 3 3 3 3 3 5 5 8 5(2) 5(2)
1.5” 3 3 3 3 3 3 3 5 8 8
2.0” 3 3 3 3 3 3 3 3 5 8
0.50 0.75 1.00 1.50 2.00 2.50 3.00 4.00 6.00 8.00
Pipe Size (in inches) Insulation
0.50 0.75 1.00 1.50 2.00 2.50 3.00 4.00 6.00 8.00
Pipe Size (in inches) Insulation
0.50 0.75 1.00 1.50 2.00 2.50 3.00 4.00 6.00 8.00
Metallic Pipe Applications* include Carbon Steel,
Stainless Steel and Copper pipe.
Non-Metallic Pipe Applications* include FRP, PVC,
CPVC, HDPE, ABS and Polypropylene.
315-SA-040
2 February 2009
NELSON™
PIPING FREEZE PROTECTION
APPLICATION INFORMATION
TYPE CLT
Cable Selection @ -20°F Minimum Ambient Temperature
Application Design Conditions
Maintain Temperature
Insulation Type Fiberglass
Wind Speed 20 MPH
Safety Factor 10%
Heater Attachment GT-6 Fiberglass Tape
The information in the tables below represents the wattage of cable necessary to meet the Design Conditions. CLT3 = 3,
CLT5 = 5, CLT8 = 8. If a single pass of cable does not satisfy the heat loss requirement, then multiple passes are shown.
Example: 5(2) (two passes of 5 watt product).
40
°
F
Metallic Pipe Applications *
208 VAC
Pipe Size (in inches) Insulation
Thickness
0.5” 5 5 5 8 8 8
1.0” 3 3 5 5 5 5 8 8 5(2) 8(2)
1.5” 3 3 3 5 5 5 5 8 8 5(2)
2.0” 3 3 3 3 3 5 5 5 8 8
0.50 0.75 1.00 1.50 2.00 2.50 3.00 4.00 6.00 8.00
120/240 VAC
Pipe Size (in inches) Insulation
Thickness
0.5” 3 5 5 5 8 8
1.0” 3 3 3 3 5 5 5 8 8 5(2)
1.5” 3 3 3 3 3 3 5 5 8 8
2.0” 3 3 3 3 3 3 3 5 5 8
0.50 0.75 1.00 1.50 2.00 2.50 3.00 4.00 6.00 8.00
277 VAC
Pipe Size (in inches) Insulation
Thickness
0.5” 3 3 3 5 5 8 8 5(2) 8(2)
1.0” 3 3 3 3 3 3 5 5 8 5(2)
1.5” 3 3 3 3 3 3 3 5 5 8
2.0” 3 3 3 3 3 3 5 5
0.50 0.75 1.00 1.50 2.00 2.50 3.00 4.00 6.00 8.00
Non-Metallic Pipe Applications *
208 VAC
Pipe Size (in inches) Insulation
Thickness
0.5” 8 8 8 5(2) 8(2) 8(2)
1.0” 5 5 5 8 8 8 5(2) 8(2)
1.5” 3 5 5 5 8 8 8 5(2) 8(2) 8(2)
2.0” 3 3 5 5 5 5 8 8 5(2) 8(2)
120/240 VAC
Thickness
0.5” 5 5 8 5(2) 5(2) 8(2) 8(2)
1.0” 3 5 5 5 8 8 8 5(2) 8(2)
1.5” 3 3 3 5 5 5 8 8 5(2) 8(2)
2.0” 3 3 3 3 5 5 5 8 8 5(2)
277 VAC
Thickness
0.5” 5 5 5 8 5(2) 5(2) 8(2) 8(2)
1.0” 3 3 3 5 5 8 8 5(2) 8(2)
1.5” 3 3 3 3 5 5 5 8 5(2) 8(2)
2.0” 3 3 3 3 3 3 5 5 8 5(2)
0.50 0.75 1.00 1.50 2.00 2.50 3.00 4.00 6.00 8.00
Pipe Size (in inches) Insulation
0.50 0.75 1.00 1.50 2.00 2.50 3.00 4.00 6.00 8.00
Pipe Size (in inches) Insulation
0.50 0.75 1.00 1.50 2.00 2.50 3.00 4.00 6.00 8.00
Metallic Pipe Applications* include Carbon Steel,
Stainless Steel and Copper pipe.
Non-Metallic Pipe Applications* include FRP, PVC,
CPVC, HDPE, ABS and Polypropylene.
315-SA-040
3 February 2009
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