PRODUCT SPECIFICATIONS

D1-HPT™ POWER LIMITING HEATING CABLE

For Division 1 Hazardous Areas

APPLICATION 1
High performance D1-HPT power-limiting heating cables
are designed for process temperature maintenance or 2
freeze protection where high maintain temperatures or
high temperature exposure is required. 4

A coiled resistor alloy heating element provides the power-

5
limiting feature of D1-HPT. This PTC (Positive Temperature
Coefficient) characteristic decreases the cable’s power
output as the heat-traced product temper-ature increases 7
and allows the cable to be overlapped during installation.
The composite construction of the heating element and
fiber substrate, plus an additional fiber cushion layer, 8
provides an exceptionally durable high performance
heating cable.
D1-HPT cables are specifically approved for use in Division 1
hazardous (classified) areas.
CONSTRUCTION
1 Nickel-plated copper bus wires (12 AWG)
RATINGS
2 Composite metal alloy/fiber
Available watt densities............. 5, 10, 15, 20 w/ft @ 50°F
(16, 33, 49, 66 w/m @ 10°C) 3 Heater bus connection (not shown)
Supply voltages 1............................. 120/240 Vac nominal 4 Fiberglass braid
Max. maintenance temperature 5 Fluoropolymer dielectric insulation
HPT 5.....................................................410°F (210°C)
6 Fiberglass braid (not shown)
HPT 10...................................................374°F (190°C)
HPT 15...................................................347°F (175°C) 7 Nickel-plated copper braid
HPT 20...................................................302°F (150°C) 8 Fluoropolymer overjacket provides additional protection
Max. continuous exposure temperature to cable and braid where exposure to chemicals or
Power-off................................................500°F (260°C) corrosives is expected
Minimum installation temperature............... -60°F (-51°C)
Minimum bend radius BASIC ACCESSORIES
@ -60°F (-51°C)..................................... 1.25” (32 mm) The D1-ECK kit (pictured below) is required for power
@ 5°F (-15°C).......................................... .38” (10 mm) connection and heating cable termination in Division
T-rating 2 1 hazardous (classified) areas. D1-ECK-2 kits for in-
Based on stabilized design 3............................T2 to T6 line splices and D1-ECT kits for
T-splices are also available.
Notes
1. Operating voltages up to 480 Vac may be possible. Contact Thermon for design If D1-HPT cable terminations
assistance.
and/or splices are located more
2. T-rating per internationally recognized testing agency guidelines.
3. Thermon heating cables are approved for the listed T-ratings using the stabilized
than 1’ (305 mm) outside the
design method. This enables the cable to operate in hazardous areas without Division 1 hazardous area, Division
limiting thermostats. The T-rating may be determined using CompuTrace® Electric 2 approved termination kits may be
Heat Tracing Design Software or contact Thermon for design assistance.
used. For additional information on
these accessories, refer to Form
TEP0010.

THERMON The Heat Tracing Specialists®

Corporate Headquarters:100 Thermon Dr • PO Box 609 San Marcos, TX 78667-0609 • Phone: 512-396-5801 • 1-800-820-4328
For the Thermon office nearest you visit us at . . . www.thermon.com

Form TEP0012-0914 • © Thermon Manufacturing Co. • Printed in U.S.A. • Information subject to change.
 PRODUCT SPECIFICATIONS

D1-HPT™ POWER LIMITING HEATING CABLE

For Division 1 Hazardous Areas

POWER OUTPUT CURVES 1 CIRCUIT BREAKER SIZING 2

The power outputs shown apply to cable installed on Maximum circuit lengths for various circuit breaker
insulated metallic pipe (using the procedures outlined in amperages are shown below. Breaker sizing should be
IEEE Standard 515) at the service voltages stated below. based on the National Electrical Code, Canadian Electrical
For use on other service voltages, contact Thermon. Code or any other applicable code. The National Electrical
Code and Canadian Electrical Code require ground-fault
Catalog Zone Catalog Zone Power Output at protection of equipment for each branch circuit supplying
Number Length Number Length 50°F (10°C) electric heating equipment. Check local codes for ground-
120 Vac in (cm) 240 Vac in (cm) w/ft (m)
fault protection requirements.
D1-HPT 5-1 24 (61) D1-HPT 5-2 30 (76) 5 (16)
120 Vac Service Voltage
Max. Circuit Length 3 vs. Breaker Size
D1-HPT 10-1 18 (46) D1-HPT 10-2 24 (61) 10 (33) Start-Up ft (m)
Catalog
Temperature
Number
D1-HPT 15-1 18 (46) D1-HPT 15-2 24 (61) 15 (49) °F (°C) 20A 30A 40A 50A
50 (10) 335 (102) 445 (136) 445 (136) 445 (136)
D1-HPT 20-1 12 (30) D1-HPT 20-2 24 (61) 20 (66) 0 (-18) 335 (102) 445 (136) 445 (136) 445 (136)
HPT 5-1
-20 (-29) 335 (102) 445 (136) 445 (136) 445 (136)
-40 (-40) 335 (102) 445 (136) 445 (136) 445 (136)
20 50 (10) 170 (52) 265 (81) 315 (96) 315 (96)
(66)
0 (-18) 170 (52) 265 (81) 315 (96) 315 (96)
HPT 10-1
Watts per Foot (w/m)

HPT 20 -20 (-29) 170 (52) 265 (81) 315 (96) 315 (96)
15
(49) -40 (-40) 170 (52) 265 (81) 315 (96) 315 (96)

HPT 15 50 (10) 115 (35) 175 (53) 245 (75) 255 (78)
10
(33) 0 (-18) 105 (32) 175 (53) 245 (75) 255 (78)
HPT 15-1
-20 (-29) 100 (30) 175 (53) 245 (75) 255 (78)
HPT 10
5 -40 (-40) 95 (29) 175 (53) 245 (75) 255 (78)
(16)
50 (10) 90 (27) 135 (41) 185 (56) 205 (62)
HPT 5
0 (-18) 85 (26) 130 (40) 175 (53) 205 (62)
0 HPT 20-1
-20 (-29) 80 (24) 125 (38) 170 (52) 205 (62)
50 100 150 200 250 300 350 400
(10) (38) (66) (93) (121) (149) (177) (204) -40 (-40) 80 (24) 120 (37) 165 (50) 205 (62)
Pipe Temperature °F (°C)

240 Vac Service Voltage

Max. Circuit Length 3vs. Breaker Size
CERTIFICATIONS/APPROVALS Start-Up ft (m)
Catalog
FM Approvals Temperature
Number
Ordinary Locations °F (°C) 20A 30A 40A 50A
Hazardous (Classified) Location 50 (10) 675 (206) 890 (272) 890 (272) 890 (272)
Class I, Division 1, Groups B, C and D
Class II, Division 1, Groups E, F and G 0 (-18) 675 (206) 890 (272) 890 (272) 890 (272)
HPT 5-2
Underwriters Laboratories Inc. -20 (-29) 675 (206) 890 (272) 890 (272) 890 (272)
Ordinary Locations -40 (-40) 675 (206) 890 (272) 890 (272) 890 (272)
Hazardous (Classified) Locations
Class I, Division 1, Groups B, C and D 50 (10) 340 (104) 525 (160) 630 (192) 630 (192)
Class II, Division 1, Groups E, F and G 0 (-18) 340 (104) 525 (160) 630 (192) 630 (192)
HPT 10-2
Approvals require the use of D1-ECK or D1-ECT kits for all -20 (-29) 340 (104) 525 (160) 630 (192) 630 (192)
connections (power, splice, tee and end terminations) located
within 1’ (305 mm) of a Class I, Division 1 hazardous area. -40 (-40) 340 (104) 525 (160) 630 (192) 630 (192)
50 (10) 230 (70) 355 (108) 490 (149) 515 (157)
IEEE 515 requires that Thermon review all Division 1
application designs. 0 (-18) 230 (70) 355 (108) 490 (149) 515 (157)
HPT 15-2
-20 (-29) 230 (70) 355 (108) 490 (149) 515 (157)
-40 (-40) 230 (70) 355 (108) 490 (149) 515 (157)
Notes
1. For more precise power output values as a function of pipe temperature, refer to 50 (10) 175 (53) 270 (82) 370 (113) 410 (125)
CompuTrace®. 0 (-18) 170 (52) 255 (78) 350 (107) 410 (125)
2. Based on the trip current characteristic of Type QOB or Type QO equipment HPT 20-2
-20 (-29) 165 (50) 250 (76) 340 (104) 410 (125)
protection devices. For devices with other trip current characteristics, contact
Thermon. -40 (-40) 160 (49) 245 (75) 330 (101) 410 (125)
3. The maximum circuit length is for one continuous length of cable, not the sum of
segments of cable. Refer to CompuTrace® design software or contact Thermon
for current loading of segments.