This document provides product information on Nelson self-regulating heater cables, including models CLT, LT, and QLT. It describes the construction and operating principle of the cables, which use a conductive core material to automatically adjust heat output based on temperature changes. Specifications, performance data, and application information is given for each cable model. The document is intended to help customers select the appropriate Nelson heater cable for their temperature maintenance needs.

1. Nelson Easy Heat Europe
Sluisweg 19a
5145 PE Waalwijk
The Netherlands
Tel.: +31 (0)416 543 301
Fax: +31 (0)416 543 339
www.easyheat.eu
Nelson Self Regulating Heater cables
Product catalog
Easy Heat Europe b.v. Commercial register The Netherlands 18047721 July 2008
Tel: +44 (0)191 490 1547
Fax: +44 (0)191 477 5371
Email: northernsales@thorneandderrick.co.uk
Website: www.heattracing.co.uk
www.thorneanderrick.co.uk

2. NELSON™
SPECIFICATION/APPLICATION
230V TYPE CLT SELF-REGULATING HEATER CABLE INFORMATION
Description:
Nelson Type CLT 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, 1.0 mm
2
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 outer jacket
is then extruded over the inner jacket. A
stranded copper metal braid and
thermoplastic elastomer overjacket is
supplied on all heaters.
Operating Principle:
The parallel bus wires apply
voltage along the entire length of the
heater cable. The conductive core
provides a continuous parallel heating
element 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
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 its heat output, it
provides for the efficient use of electric
power, producing heat only when and
where it is needed.
Specifications:
Maintain Temperature 65°C
Maximum Continuous Exposure Temperature 65°C (continuous power on)
Maximum Intermittent Exposure Temperature 85°C (1000 hours cumulative exposure)
Bus Wire Size 1.0 mm2
Copper Conductors
Tinned Copper Braid Resistance Maximum 0.015 Ω/m
Product Dimensions (Nominal) 6.7mm x 11.0mm
Product Weight 106.0 g/m
Minimum Installation Temperature -40°C
Minimum Bend Radius 12.0 mm at –40°C
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 product
pipelines, fire protection, process water,
dust suppression systems and
structure anti-icing are typical
applications for this product.
CLT23-JT
CLT25-JT
CLT28-JT
• Thermoplastic Elastomer Overjacket
• Tinned Copper Metal Braid
• Stranded Plated Copper Conductors
• Continuous Self-Regulating Conductive Core
• Bonded Inner Thermoplastic Jacket
• Outer Thermoplastic Elastomer Jacket

3. NELSON™
SPECIFICATION/APPLICATION
230V TYPE CLT SELF-REGULATING HEATER CABLE INFORMATION
Performance and Rating Data:
Catalog
Number
Service
Voltage
Maximum
Segment
Length
Maximum
Maintenance
Temperature
Maximum
Intermittent
Exposure
CLT23 230 145 65°C 85°C
CLT25 230 120 65°C 85°C
CLT28 230 100 65°C 85°C
Circuit Breaker Selection:
Total Heater Length in Meters ² Vs. Circuit Breaker Size
230 Volt
Watts/M
Start-Up
Temp. 16A 20A 25A 32A 40A
9 10°C 251 313 392 501 626
-5°C 207 259 323 414 517
-20°C 176 220 275 352 440
-30°C 160 200 250 321 401
15 10°C 171 214 267 342 427
-5°C 142 177 222 284 355
-20°C 121 152 189 242 303
-30°C 111 138 173 221 276
25 10°C 89 112 140 179 223
-5°C 74 93 116 149 186
-20°C 64 80 100 128 159
-30°C 58 73 91 116 146
Notes: 1. The circuit length values shown above are for estimation only.
2. Total Heater Length is the total length of heater cable that can be installed on a breaker without tripping either under start-up or
operating conditions. Values may indicate that multiple heater segments must be installed on the breaker with none of the segments
exceeding the Maximum Segment Lengths as shown in the Performance and Rating table.
3. For detailed information on maximum circuit lengths or additional voltages, refer to Nelson Heat Tracing Systems
Selection software or contact your local Nelson representative for assistance.

4. NELSON™
SPECIFICATION/APPLICATION
230V TYPE CLT SELF-REGULATING HEATER CABLE INFORMATION
NELSON HEAT TRACING SYSTEMS • P.O. BOX 726 • TULSA, OK 74101 • 918-627-5530 • FAX 918-641-7336 • www.nelsonheaters.com 315-SA-021
© 2005 Nelson Heat Tracing Systems 03/06
Power Output Rating:
A B C
CLT23-JT CLT25-JT CLT28-JT
Power Output (watts per meter at 10°C)
9 15 25
Approvals:
CLT Series heating cables are VDE approved for use in ordinary locations.
Accessories:
Connection Kits for Power Connection, Splices and End Seals
Thermostatic Controls (Nelson TA and TH Series)
Enclosures, Tapes and Warning Signs
Nelson Heat Tracing Systems products are supplied with a limited warranty. Complete Terms and Conditions may be found on Nelson's website at
www.nelsonheaters.com.
Power output on insulated metallic pipe at 230VAC
0 10 20 30 40 50 60 70 80
102030406080100
TEMPERATURE DEGREES C
WATTSPERMETER
A
B
Tel: +44 (0)191 490 1547
Fax: +44 (0)191 477 5371
Email: northernsales@thorneandderrick.co.uk
Website: www.heattracing.co.uk
www.thorneanderrick.co.uk

5. NELSON™
SPECIFICATION/APPLICATION
230V TYPE LT SELF-REGULATING HEATER CABLE INFORMATION
Description:
Nelson 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.
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
outer jacket is then extruded over the
inner jacket.
A stranded copper metal braid and
fluoropolymer overjacket is supplied on
all heaters.
Operating Principle:
The parallel bus wires apply
voltage along the entire length of the
heater cable. The conductive core
provides a continuous parallel heating
element 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
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 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.
Specifications:
Maintain Temperature 65°C
Maximum Continuous Exposure Temperature 65°C (continuous power on)
Maximum Intermittent Exposure Temperature 85°C (1000 hours cumulative exposure)
Temperature Classification (T Code) T6 (85°C) / T5 (100°C) per European Standard EN 50014
Bus Wire Size 1.22 mm2
Copper Conductors
Tinned Copper Braid Resistance Maximum 0.015 Ω/m
Product Dimensions (Nominal) 6.2mm x 12.2mm
Product Weight 106.0 g/m
Minimum Installation Temperature -40°C
Minimum Bend Radius 12.0 mm at –40°C
Application:
Nelson’s Type LT self-regulating
heater cable is ideal for maintaining fluid
flow under low ambient conditions. The
product is used for freeze protection and
low watt density process temperature
maintenance of pipes and vessels.
Typical applications include process
water, lube oil, fire protection, dust
suppression and structure deicing. The
standard cable is supplied with a tinned
copper metal braid and a fluoropolymer
overjacket suitable for exposure to
excessive moisture, organic and
inorganic chemicals, solvents, etc. in
Zone 1 and Zone 2 hazardous areas
and in ordinary areas.
LT23-J
LT25-J
LT28-J
LT210-J
• Optional Overjacket Constructions
• Tinned Copper Metal Braid
• Stranded Plated Copper Conductors
• Continuous Self-Regulating Conductive Core
• Bonded Inner Thermoplastic Jacket
• Outer Thermoplastic Elastomer Jacket

6. NELSON™
SPECIFICATION/APPLICATION
230V TYPE LT SELF-REGULATING HEATER CABLE INFORMATION
Performance and Rating Data:
Catalog
Number
Service
Voltage
Maximum
Segment
Length
Maximum
Maintenance
Temperature
Maximum
Intermittent
Exposure
T-Rating*
LT23 230 185 65°C 85°C T6
LT25 230 155 65°C 85°C T6
LT28 230 125 65°C 85°C T5
LT210 230 115 65°C 85°C T5
*Electrical equipment T-rating codes define the maximum surface temperature that equipment will reach. It is intended for
applications in potentially explosive atmospheres – Directive 94/9/EC.
Circuit Breaker Selection:
Total Heater Length in Meters ² Vs. Circuit Breaker Size
230 Volt
Watts/M
Start-Up
Temp. 16A 20A 25A 32A 40A
9 10°C 241 302 377 482 603
-5°C 192 240 300 384 480
-20°C 159 199 249 319 398
-30°C 143 179 224 286 358
15 10°C 170 213 266 341 426
-5°C 135 169 212 271 338
-20°C 112 140 175 225 281
-30°C 101 126 157 202 252
25 10°C 90 113 141 180 225
-5°C 74 92 116 148 185
-20°C 63 78 98 125 157
-30°C 57 71 89 114 142
32 10°C 57 72 89 115 143
-5°C 48 60 75 96 120
-20°C 41 52 65 83 104
-30°C 38 47 59 76 95
Notes: 1. The circuit length values shown above are for estimation only.
2. Total Heater Length is the total length of heater cable that can be installed on a breaker without tripping either under start-up
or operating conditions. Values may indicate that multiple heater segments must be installed on the breaker with none of
the segments exceeding the Maximum Segment Lengths as shown in the Performance and Rating table.
3. For detailed information on maximum circuit lengths or additional voltages, refer to Nelson Heat Tracing Systems Selection
software or contact your local Nelson representative for assistance.
Construction Options:
Standard Feature Suffix Optional Feature Suffix (Delete –J and add)
-J A tinned copper metal braid with a fluoropolymer overjacket
for use when the heater cable is exposed to excessive
moisture, organic chemicals, solvents, etc. in hazardous and
ordinary areas.
-JT A tinned copper metal braid with a thermoplastic elastomer
overjacket is available for use when the heater cable is
exposed to aqueous solutions of inorganic chemicals or
where mechanical abuse is a problem in hazardous and
ordinary areas.

7. NELSON™
SPECIFICATION/APPLICATION
230V TYPE LT SELF-REGULATING HEATER CABLE INFORMATION
Power Output Rating:
A B C D
T23-J LT25-J LT28-J LT210-J
LT23-JT LT25-JT LT28-JT LT210-JT
Power Output (watts per meter at 10°C)
9 15 25 32
Approvals:
LT Series heating cables are approved for use in Zone 1 and Zone 2 hazardous areas by KEMA.
The product type has been tested in accordance with the European Standard EN 50014:1997 and EN 50019:2000.
II 2 G D EEx e II
KEMA 03ATEX 2019U
KEMA 03ATEX 2020X
-40
°
C ≤ Tamb ≤ +55
°
C, TP 85
°
C
Accessories:
Connection Kits for Power Connection, Splices and End Seals (Nelson Z1-PLT Series, Z1-ALT Series, and
Component Series)
Thermostatic Controls (Nelson TA and TH Series)
Enclosures, Tapes and Warning Signs
Nelson Heat Tracing Systems products are supplied with a limited warranty. Complete Terms and
Conditions may be found on Nelson's website at www.nelsonheaters.com.
NELSON HEAT TRACING SYSTEMS • P.O. BOX 726 • TULSA, OK 74101 • 918-627-5530 • FAX 918-641-7336 •
www.nelsonheaters.com
© 2005 Nelson Heat Tracing Systems
Power output on insulated metallic pipe at 230VAC
0 10 20 30 40 50 60 70 80
102030406080100
TEMPERATURE DEGREES C
WATTSPERMETER
A
B
C
D
Tel: +44 (0)191 490 1547
Fax: +44 (0)191 477 5371
Email: northernsales@thorneandderrick.co.uk
Website: www.heattracing.co.uk
www.thorneanderrick.co.uk

8. NELSON™
SPECIFICATION/APPLICATION
230V TYPE QLT SELF-REGULATING HEATER CABLE INFORMATION
Description:
Nelson’s Self-Regulating Heater
Cable Type QLT is a parallel circuit
electric heater strip. A conductive
fluoropolymer core material is extruded
over the multi-stranded, nickel-plated, 16
gauge copper bus wires. A fluoropolymer
jacket provides excellent dielectric
strength, moisture resistance, protection
from impact and abrasion damage, and a
wide range of chemical resistance.
A stranded tinned copper metal braid
and fluoropolymer overjacket is supplied
on all heaters.
Operating Principle:
The parallel bus wires apply voltage
along the entire length of the heater
cable. The conductive core provides a
continuous parallel heating element
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 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
its heat output, it limits the maximum
sheath temperature, while also providing
useful power for process temperature
maintenance.
Specifications:
Maintain Temperature 120°C
Maximum Continuous Exposure Temperature 120°C (continuous power on)
Maximum Intermittent Exposure Temperature 120°C (1000 hours cumulative exposure)
Temperature Classification (T Code) T3 (200°C) per European Standard EN 50014
Bus Wire Size 1.22 mm
2
Copper Conductors
Tinned Copper Braid Resistance Maximum 0.015 Ω/m
Product Dimensions (Nominal) 5.1mm x 10.5mm
Product Weight 112.0 g/m
Minimum Installation Temperature -40°C
Minimum Bend Radius 12.0 mm at –40°C
Application:
Nelson’s Type QLT self-regulating
heater cable is ideal for maintaining fluid
flow over a wide range of operating
temperatures. The product is used for
freeze protection and process
temperature maintenance of metallic
pipes and vessels. Typical applications
include hydrocarbon and chemical
product piping systems. The standard
cable is supplied with a tinned copper
metal braid and a fluoropolymer
overjacket suitable for exposure to
excessive moisture, organic chemicals,
solvents, etc. in Zone 1 and Zone 2
hazardous areas and in ordinary areas.
• Fluoropolymer Overjacket
• Tinned Copper Metal Braid
• Continuous Self Regulating Conductive Core
• Fluoropolymer Electrical Jacket
• Nickel Plated Copper Conductors

9. NELSON™
SPECIFICATION/APPLICATION
230V TYPE QLT SELF-REGULATING HEATER CABLE INFORMATION
Performance and Rating Data:
Catalog
Number
Service
Voltage
Maximum
Segment
Length
Maximum
Maintenance
Temperature
Maximum
Intermittent
Exposure
T-Rating*
QLT210 230 115 120°C 120°C T3
QLT215 230 95 120°C 120°C T3
QLT220 230 75 120°C 120°C T3
*Electrical equipment T-rating codes define the maximum surface temperature that equipment will reach. It is intended for
applications in potentially explosive atmospheres – Directive 94/9/EC.
Circuit Breaker Selection:
Total Heater Length in Meters ² Vs. Circuit Breaker Size
230 Volt
Watts/M
Start-up
Temp. 16A 20A 25A 32A 40A
32 +10°C 99 124 155 199 249
-5°C 93 116 145 185 231
-20°C 87 108 135 173 217
-30°C 83 104 130 166 208
46 +10°C 70 87 109 139 174
-5°C 65 81 102 130 163
-20°C 61 77 96 123 153
-30°C 59 74 92 118 147
63 +10°C 53 66 83 106 133
-5°C 51 63 79 101 126
-20°C 48 60 75 96 120
-30°C 47 58 73 93 117
Notes: 1. The circuit length values shown above are for estimation only.
2. Total Heater Length is the total length of heater cable that can be installed on a breaker without tripping either under start-up
or operating conditions. Values may indicate that multiple heater segments must be installed on the breaker with none of
the segments exceeding the Maximum Segment Lengths as shown in the Performance and Rating table.
3. For detailed information on maximum circuit lengths or additional voltages, refer to Nelson Heat Tracing Systems Selection
software or contact your local Nelson representative for assistance.

10. NELSON™
SPECIFICATION/APPLICATION
230V TYPE QLT SELF-REGULATING HEATER CABLE INFORMATION
NELSON HEAT TRACING SYSTEMS • P.O. BOX 726 • TULSA, OK 74101 • 918-627-5530 • FAX 918-641-7336 • www.nelsonheaters.com 314-SA-012
© 2005 Nelson Heat Tracing Systems 12/05
Power Output Rating:
A B C
QLT210-J QLT215-J QLT220-J
Power Output (watts per meter at 10°C)
32 46 63
Approvals:
QLT Series heating cables are approved for use in Zone 1 and Zone 2 hazardous areas by KEMA.
The product type has been tested in accordance with the European Standard EN 50014:1997 and EN 50019:2000.
II 2 G D EEx e II
KEMA 03 ATEX 2020 X
-40
°
C ≤ Tamb ≤ +55
°
C, TP 120
°
C
Accessories:
Connection Kits for Power Connection, Splices and End Seals (Nelson Z1-PLT Series, Z1-ALT Series, and
Component Series)
Thermostatic Controls (Nelson TA and TH Series)
Enclosures, Tapes and Warning Signs
Nelson Heat Tracing Systems products are supplied with a limited warranty. Complete Terms and Conditions may be found on Nelson's website at
www.nelsonheaters.com
Power output on insulated metallic pipe at 230VAC
0 20 40 60 80 100 120 140 160
1020304050607080
TEMPERATURE DEGREES C
WATTSPERMETER
B
C
A
Tel: +44 (0)191 490 1547
Fax: +44 (0)191 477 5371
Email: northernsales@thorneandderrick.co.uk
Website: www.heattracing.co.uk
www.thorneanderrick.co.uk

11. NELSON™
SPECIFICATION/APPLICATION
230V TYPE HLT SELF-REGULATING HEATER CABLE INFORMATION
Description:
Nelson’s Self-Regulating Heater
Cable Type HLT is a parallel circuit
electric heater strip. A conductive
fluoropolymer core material is extruded
over the multi-stranded, nickel-plated, 16
gauge copper bus wires. A fluoropolymer
jacket provides excellent dielectric
strength, moisture resistance, protection
from impact and abrasion damage, and a
wide range of chemical resistance.
A stranded tinned copper metal braid
and fluoropolymer overjacket is supplied
on all heaters.
Operating Principle:
The parallel bus wires apply voltage
along the entire length of the heater
cable. The conductive core provides a
continuous parallel heating element
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 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. As the cable
self- regulates its heat output, it limits the
maximum sheath temperature, while also
providing useful power for process
temperature maintenance.
Specifications:
Maintain Temperature 120°C
Maximum Continuous Exposure Temperature 120°C (continuous power on)
Maximum Intermittent Exposure Temperature 190°C (1000 hours cumulative exposure)
Temperature Classification (T Code) T3 (200°C) per European Standard EN 50014
Bus Wire Size 1.22 mm2
Copper Conductors
Tinned Copper Braid Resistance Maximum 0.015 Ω/m
Product Dimensions (Nominal) 5.1mm x 10.5mm
Product Weight 112.0 g/m
Minimum Installation Temperature -40°C
Minimum Bend Radius 12.0 mm at –40°C
Application:
Nelson’s Type HLT self-regulating
heater cable is ideal for maintaining fluid
flow over a wide range of operating
temperatures. The product is used for
freeze protection of periodically steam-
cleaned metallic pipes and process
temperature maintenance of metallic
pipes and vessels. Typical applications
include hydrocarbon and chemical
product piping systems. The standard
cable is supplied with a tinned copper
metal braid and a fluoropolymer
overjacket suitable for exposure to
excessive moisture, organic and
inorganic chemicals, solvents, etc. in
Zone 1 and Zone 2 hazardous areas and
in ordinary areas.
HLT23-J
HLT25-J
HLT28-J
HLT210-J
HLT212-J
HLT215-J
HLT218-J
HLT220-J
• Fluoropolymer Overjacket
• Tinned Copper Metal Braid
• Continuous Self Regulating Conductive Core
• Fluoropolymer Electrical Jacket
• Nickel Plated Copper Conductors

12. NELSON™
SPECIFICATION/APPLICATION
230V TYPE HLT SELF-REGULATING HEATER CABLE INFORMATION
NELSON HEAT TRACING SYSTEMS • P.O. BOX 726 • TULSA, OK 74101 • 918-627-5530 • FAX 918-641-7336 • www.nelsonheaters.com 314-SA-021
© 2005 Nelson Heat Tracing Systems 12/05
Performance and Rating Data:
Catalog
Number
Service
Voltage
Maximum
Segment
Length
Maximum
Maintenance
Temperature
Maximum
Intermittent
Exposure
T-Rating*
HLT23 230 185 120°C 190°C T3
HLT25 230 155 120°C 190°C T3
HLT28 230 125 120°C 190°C T3
HLT210 230 115 120°C 190°C T3
HLT212 230 105 120°C 190°C T3
HLT215 230 95 120°C 190°C T3
HLT218 230 80 120°C 190°C T3
HLT220 230 75 120°C 190°C T3
*Electrical equipment T-rating codes define the maximum surface temperature that equipment will reach. It is intended for
applications in potentially explosive atmospheres – Directive 94/9/EC.
Circuit Breaker Selection:
Total Heater Length in Meters ² Vs. Circuit Breaker Size
240 Volt
Watts/M
Start-up
Temp. 16A 20A 25A 32A 40A
9 +10°C 244 305 381 488 610
-5°C 227 283 354 453 567
-20°C 212 265 331 424 530
-30°C 203 254 317 406 507
15 +10°C 174 218 272 348 435
-5°C 161 201 251 322 402
-20°C 149 187 234 299 374
-30°C 143 178 223 286 357
25 +10°C 121 151 188 241 302
-5°C 113 141 177 226 282
-20°C 106 133 166 213 266
-30°C 102 128 160 204 256
32 +10°C 99 124 155 199 249
-5°C 93 116 145 185 231
-20°C 87 108 135 173 217
-30°C 83 104 130 166 208
37 +10°C 85 107 133 171 214
-5°C 80 100 125 160 200
-20°C 75 94 117 150 188
-30°C 72 90 113 144 180
46 +10°C 70 87 109 139 174
-5°C 65 81 102 130 163
-20°C 61 71 96 123 153
-30°C 59 74 92 118 147
56 +10°C 59 74 92 118 148
-5°C 56 70 87 112 140
-20°C 53 66 83 106 133
-30°C 51 64 80 102 128
63 +10°C 53 66 83 106 133
-5°C 51 63 79 101 126
-20°C 48 60 75 96 120
-30°C 47 58 73 93 117
Notes: 1. The circuit length values shown above are for estimation only.
2. Total Heater Length is the total length of heater cable that can be installed on a breaker without tripping either under start-up
or operating conditions. Values may indicate that multiple heater segments must be installed on the breaker with none of
the segments exceeding the Maximum Segment Lengths as shown in the Performance and Rating table.
4. For detailed information on maximum circuit lengths or additional voltages, refer to Nelson Heat Tracing Systems Selection
software or contact your local Nelson representative for assistance.
Tel: +44 (0)191 490 1547
Fax: +44 (0)191 477 5371
Email: northernsales@thorneandderrick.co.uk
Website: www.heattracing.co.uk
www.thorneanderrick.co.uk

13. NELSON™
SPECIFICATION/APPLICATION
230V TYPE HLT SELF-REGULATING HEATER CABLE INFORMATION
NELSON HEAT TRACING SYSTEMS • P.O. BOX 726 • TULSA, OK 74101 • 918-627-5530 • FAX 918-641-7336 • www.nelsonheaters.com 314-SA-021
© 2005 Nelson Heat Tracing Systems 12/05
Power Output Rating:
A B C D E F G H
HLT23-J HLT25-J HLT28-J HLT210-J HLT212-J HLT215-J HLT218-J HLT220-J
Power Output (watts per meter at 10°C)
9 15 25 32 37 46 56 63
Approvals:
HLT Series heating cables are approved for use in Zone 1 and Zone 2 hazardous areas by KEMA.
The product type has been tested in accordance with the European Standard EN 50014:1997 and EN 50019:2000.
II 2 G D EEx e II
KEMA 03 ATEX 2019U
KEMA 03 ATEX 2020X
-40
°
C ≤ Tamb ≤ +55
°
C, TP 190
°
C
Accessories:
Connection Kits for Power Connection, Splices and End Seals (Nelson Z1-PLT Series, Z1-ALT Series, and
Component Series)
Thermostatic Controls (Nelson TA and TH Series)
Enclosures, Tapes and Warning Signs
Nelson Heat Tracing Systems products are supplied with a limited warranty. Complete Terms and Conditions may be found on Nelson's website at
www.nelsonheaters.com.
Power output on insulated metallic pipe at 230VAC
1020304050607080
TEMPERATURE DEGREES C
WATTSPERMETER
B
C
D
E
G
H
F
A
Tel: +44 (0)191 490 1547
Fax: +44 (0)191 477 5371
Email: northernsales@thorneandderrick.co.uk
Website: www.heattracing.co.uk
www.thorneanderrick.co.uk

14. NELSON™
DOMESTIC HOT WATER
230V TEMPERATURE MAINTENANCE SYSTEM
S P E C I F I C A T I O N / A P P L I C A T I O N I N F O R M A T I O N
Description:
Nelson 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 outer jacket is then
extruded over the inner jacket. A
stranded tinned copper metal
braid is supplied on all heaters. A
color-coded modified polyolefin
overjacket is supplied for positive
identification during installation.
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 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.
Application:
Nelson's Type LT domestic
hot water heating cable is an
energy-efficient and economical
alternative to common
recirculation systems. The
heating cable is used to
maintain water temperature in
the supply piping system,
reducing or eliminating the delay
in obtaining hot water at each
fixture. This cable system
eliminates the need for return
piping, pumps, check valves and
pressure balancing valves found
in recirculating systems. In
addition, maintenance
requirements are greatly
reduced through the elimination
of all devices with moving parts
connected to the recirculating
portion of the hot water supply
system. The standard product
offering has been designed to
maintain nominal domestic
water temperatures of 40ºC,
45ºC, 50ºC and 60ºC. These
representative hot water
temperatures are in accordance
with the 1999 ASHRAE
Applications Handbook, Service
Water Heating. The heating
cables are UL Listed and CSA
Certified for domestic hot water
temperature maintenance and
meet all requirements of IEEE
Standard 515.1, Recommended
Practice for the Testing, Design,
Installation, and Maintenance of
Electrical Resistance Heat
Tracing for Commercial
Applications.
• Stranded Plated Copper Conductors
• Self-Regulating Conductive Core
• Bonded Inner Thermoplastic Jacket
• Outer Thermoplastic Elastomer Jacket
• Color-Coded Overjacket
• Tinned Copper Braid LT-A
LT-B
LT-C
LT-D

15. NELSON™
DOMESTIC HOT WATER
230V TEMPERATURE MAINTENANCE SYSTEM
S P E C I F I C A T I O N / A P P L I C A T I O N I N F O R M A T I O N
Performance and Rating Data:
Catalog
Number
Service
Voltage
Maximum
Segment
Length
Nominal
Maintenance
Temperature
Ambient
Temperature
Range Color Code
LT-A 230 245 40°C 18°C Blue
LT-B 230 235 45°C 18°C Green
LT-C 230 220 50°C 18°C Yellow
LT-D 230 215 60°C 18°C Red
NOTE: If the specified installation does not comply with published application values, please consult your
authorized factory representative. Product is designed for applications on copper supply piping with
standard fiberglass insulation of the thickness noted in the Product Selection Tables. Contact your Nelson
representative if using other types of insulation.
Circuit Breaker Selection:
Max. Length (Feet) Vs. Circuit Breaker Size
Cable Start-Up Service
Type Temp. Voltage 16A 20A 25A 32A
LT-A 10ºC 230 241 302 377 482
LT-B 10ºC 230 170 213 266 341
LT-C 10ºC 230 90 113 141 180
LT-D 10ºC 230 57 72 89 115
Notes:
1. The circuit length values shown above are for estimation only.
2. Total Heater Length is the total length of heater cable that can be installed on a
breaker without tripping either under start-up or operating conditions. Values may
indicate that multiple heater segments must be installed on the breaker with none of
the segments exceeding the Maximum Segment Lengths as shown in the
Performance and Rating table.
3. For detailed information on maximum circuit lengths or additional voltages, refer to
Nelson Heat Tracing Systems Selection software or contact your local Nelson
representative for assistance.

16. NELSON™
DOMESTIC HOT WATER
230V TEMPERATURE MAINTENANCE SYSTEM
S P E C I F I C A T I O N / A P P L I C A T I O N I N F O R M A T I O N
Product Selection Tables:
40° C. HOT WATER SYSTEM LT-A @ 230V
Insulation
Thickness*
Copper
Pipe Diameter – Inches
½ ¾ 1 1-¼ 1-½ 2 2-½ 3 4 5 6
13
20
25
30
40
50
45° C. HOT WATER SYSTEM LT-B @ 230V
Insulation
Thickness*
Copper
Pipe Diameter – Inches
½ ¾ 1 1-¼ 1-½ 2 2-½ 3 4 5 6
13
20
25
30
40
50
50° C. HOT WATER SYSTEM LT-C @ 230V
Insulation
Thickness*
Copper
Pipe Diameter – Inches
½ ¾ 1 1-¼ 1-½ 2 2-½ 3 4 5 6
13
20
25
30
40
50
60° C. HOT WATER SYSTEM LT-D @ 230V
Insulation
Thickness*
Copper
Pipe Diameter – Inches
½ ¾ 1 1-¼ 1-½ 2 2-½ 3 4 5 6
13
20
25
30
40
50
* Fiberglass Insulation
Catalog Numbers:
CATALOG NUMBERS
Nominal Temperature

17. NELSON™
DOMESTIC HOT WATER
230V TEMPERATURE MAINTENANCE SYSTEM
S P E C I F I C A T I O N / A P P L I C A T I O N I N F O R M A T I O N
Voltage 40ºC 45ºC 50ºC 60ºC
230 VAC LT-A LT-B LT-C LT-D
The Nelson Domestic Hot Water Temperature Maintenance System has been designed to provide nominal
pipe temperatures under specific conditions. Due to variations in sealing techniques, operating environment,
installation methods, etc., exact temperatures cannot be assured without thermostatic control. This is
recommended in applications where critical temperature tolerances are required.
Approvals: CSA
Ordinary Locations –
Type LT series cables and
accessories are approved for water
temperature maintenance applications.
UL
Ordinary Locations –
Type LT series cables and
accessories are specifically
approved for hot water
temperature maintenance
applications.
Accessories:
• Connection Kits for Power Connection, Tee Splice, Splices and End Seals (Nelson PLT Series)
• Thermostatic Controls (Nelson TH and HC Series)
• Junction Boxes, Tapes and Warning Signs
• Custom Control, Monitoring and Power Panels
Nelson Heat Tracing Systems products are supplied with a limited warranty. Complete Terms and Conditions may be found on Nelson's
website at www.nelsonheaters.com.
Tel: +44 (0)191 490 1547
Fax: +44 (0)191 477 5371
Email: northernsales@thorneandderrick.co.uk
Website: www.heattracing.co.uk
www.thorneanderrick.co.uk