Heating cables
Power-limiting heating cable Thermon HPT
High performance HPT power-limiting heating cables are designed specifically for process temperature maintenance or freeze protection where high maintain temperatures or high temperature exposure is required.
A coiled resistor alloy heating element provides the power-limiting feature of HPT. This PTC (Positive Temperature Coefficient) characteristic decreases the cable’s power output as the heat-traced product temperature increases 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, provide an exceptionally durable high performance heating cable.
Features Thermon HPT
- Medium to high process temperature maintenance
- Steam clean/purge
- Certified for use in ordinary (nonclassified) areas and in potentially explosive atmospheres
Construction Thermon HPT
1. Nickel-plated copper bus wires (12 AWG).
2. Composite metal alloy/fiber.
3. Heater bus connection (not shown).
4. Fiberglass braid.
5. Fluoropolymer dielectric insulation.
6. Nickel-plated copper braid.
7. Fluoropolymer overjacket.
Ratings of Thermon HPT
- Available watt densities: 5, 10, 15, 20 w/ft 50°F
(16, 33, 49, 66 w/m @ 10°C) - Supply voltages: 120/240 Vac nominal.
- Maximum maintenance temperature:
HPT 5: 410°F (210°C)
HPT 10: 374°F (190°C)
HPT 15: 347°F (175°C)
HPT 20: 302°F (150°C) - Maximum continuous exposure temperature
Power-off: 500°F (260°C) - Minimum installation temperature: - 60°F (- 51°C)
- Minimum bend radius
- 60°F (- 51°C): 1.25” (32 mm)
5°F (-15°C): 38” (10 mm) - T-rating:
Based on stabilized design: T2 to T6
Power output curves Thermon HPT
The power outputs shown apply to cable installed on insulated metallic pipe (using the procedures outlined in IEEE 515) at the service voltages stated below. For use on other service voltages, contact Thermon.
| Catalog number 120 vac | Zone length in (cm) | Catalog number 240 vac | Zone length in (cm) | Power output at 50 °F (10°C) w/ft (m) |
|---|---|---|---|---|
| HPT 5-1 | 24 (61) | HPT 5-2 | 30 (76) | 5 (16 |
| HPT 10-1 | 18 (46) | HPT 10-2 | 24 (61) | 10 (33) |
| HPT 15-1 | 18 (46) | HPT 15-2 | 24 (61) | 15 (49) |
| HPT 20-1 | 12 (30) | HPT 20-2 | 24 (61) | 20 (66) |
Circuit breaker sizing
Maximum circuit lengths for various circuit breakeramperages are shown below. Breaker sizing should be based on the National Electrical Code, Canadian ElectricalCode or any other applicable code. The National Electrical Code and Canadian Electrical Code require ground-fault protection of equipment for each branch circuit supplying electric heating equipment. Check local codes for ground-fault protection requirements.
| 120 vac service voltage | Max. circuit length vs. breaker size ft (m) | ||||
|---|---|---|---|---|---|
| Catalog number | Start-up temperature °F (°C) | 20A | 30А | 40A | 50A |
| HPT 5-1 | 50 (10) | 335 (102) | 445 (136) | 445 (136) | 445 (136) |
| 0 (- 18) | 335 (102) | 445 (136) | 445 (136) | 445 (136) | |
| - 20 (- 29) | 335 (102) | 445 (136) | 445 (136) | 445 (136) | |
| - 40 (- 40) | 335 (102) | 445 (136) | 445 (136) | 445 (136) | |
| HPT 10-1 | 50 (10) | 170 (52) | 265 (81) | 315 (96) | 315 (96) |
| 0 (- 18) | 170 (52) | 265 (81) | 315 (96) | 315 (96) | |
| - 20 (- 29) | 170 (52) | 265 (81) | 315 (96) | 315 (96) | |
| - 40 (- 40) | 170 (52) | 265 (81) | 315 (96) | 315 (96) | |
| HPT 15-1 | 50 (10) | 115 (35) | 175 (53) | 245 (75) | 255 (78) |
| 0 (- 18) | 105 (32) | 175 (53) | 245 (75) | 255 (78) | |
| - 20 (- 29) | 100 (30) | 175 (53) | 245 (75) | 255 (78) | |
| - 40 (- 40) | 95 (29) | 175 (53) | 245 (75) | 255 (78) | |
| HPT 20-1 | 50 (10) | 90 (27) | 135 (41) | 185 (56) | 205 (62) |
| 0 (- 18) | 85 (26) | 130 (40) | 175 (53) | 205 (62) | |
| - 20 (- 29) | 80 (24) | 125 (38) | 170 (52) | 205 (62) | |
| - 40 (- 40) | 80 (24) | 120 (37) | 165 (50) | 205 (62) | |
| 240 vac service voltage | Max. circuit length vs. breaker size ft (m) | ||||
|---|---|---|---|---|---|
| Catalog number | Start-up temperature °F (°C) | 20A | 30A | 40A | 50A |
| HPT 5-2 | 50 (10) | 675 (206) | 890 (272) | 890 (272) | 890 (272) |
| 0 (- 18) | 675 (206) | 890 (272) | 890 (272) | 890 (272) | |
| - 20 (- 29) | 675 (206) | 890 (272) | 890 (272) | 890 (272) | |
| - 40 (- 40) | 675 (206) | 890 (272) | 890 (272) | 890 (272) | |
| HPT 10-2 | 50 (10) | 340 (104) | 525 (160) | 630 (192) | 630 (192) |
| 0 (- 18) | 340 (104) | 525 (160) | 630 (192) | 630 (192) | |
| - 20 (- 29) | 340 (104) | 525 (160) | 630 (192) | 630 (192) | |
| - 40 (- 40) | 340 (104) | 525 (160) | 630 (192) | 630 (192) | |
| HPT 15-2 | 50 (10) | 230 (70) | 355 (108) | 490 (149) | 515 (157) |
| 0 (- 18) | 230 (70) | 355 (108) | 490 (149) | 515 (157) | |
| - 20 (- 29) | 230 (70) | 355 (108) | 490 (149) | 515 (157) | |
| - 40 (- 40) | 230 (70) | 355 (108) | 490 (149) | 515 (157) | |
| HPT 20-2 | 50 (10) | 175 (23) | 270 (82) | 370 (113) | 410 (125) |
| 0 (- 18) | 170 (52) | 255 (78) | 350 (107) | 410 (125) | |
| - 20 (- 29) | 165 (50) | 250 (76) | 340 (104) | 410 (125) | |
| - 40 (- 40) | 160 (49) | 245 (75) | 330 (101) | 410 (125) | |