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PRODUCT SPECIFICATIONS 
VSX™ SELF-REGULATING HEATING CABLE 
CONSTRUCTION 
1 Nickel-plated copper bus wires (14 AWG) 
2 Semiconductive heating matrix and fluoropolymer 
dielectric insulation 
3 Nickel-plated copper braid 
4 Fluoropolymer overjacket provides additional protection 
for cable and braid where exposure to chemicals or 
corrosives is expected. 
BASIC ACCESSORIES 
Thermon offers system accessories designed specifically 
for rapid, trouble-free installation of Thermon heating 
cables. 
All cables require a connection kit to comply with approval 
requirements. Information on accessories to complete 
a heater circuit installation can be found in the “Heating 
Cable Systems Accessories” product specification sheet 
(Form TEP0010). 
APPLICATION 
High performance VSX self-regulating heating cables are 
designed specifically for process temperature maintenance 
or freeze protection applications where high maintain 
temperatures or high temperature exposure is required. 
The heat output of VSX cable varies in response to the 
surrounding temperature by reducing its thermal output 
with increasing temperature. With its high self-regulating 
characteristic, VSX can be installed in hazardous areas 
requiring a T3 temperature class rating. 
VSX cables are approved for use in ordinary (nonclassified) 
areas, hazardous (classified) areas, and Zone 1 and 2 
classified areas. 
RATINGS 
Available watt densities............. 5, 10, 15, 20 w/ft @ 50°F 
(16, 33, 49, 66 w/m @ 10°C) 
Supply voltages...........................110-120 or 208-277 Vac 
Max. maintenance temperature..................300°F (149°C) 
Max. exposure temperature) 
Intermittent power-on.............................450°F (232°C) 
Intermittent power-off.............................482°F (250°C) 
Continuous power-off.............................400°F (204°C) 
Minimum installation temperature............... -60°F (-51°C) 
Minimum bend radius 
@ 5°F (-15°C)......................................... 0.38” (10mm) 
@ -76°F (-60°C).................................... 1.25” (32 mm) 
T-rating 1................................................T3 392°F (200°C) 
Notes 
1. T-rating per the National Electrical Code and Canadian Electrical Code. 
1 
2 
3 
4 
THERMON The Heat Tracing Specialists® 
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 
Form TEP0008-0714 • © Thermon Manufacturing Co. • Printed in U.S.A. • Information subject to change.
PRODUCT SPECIFICATIONS 
VSX™ SELF-REGULATING HEATING CABLE 
POWER OUTPUT CURVES 1 
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. 
CIRCUIT BREAKER SIZING 2 
Maximum circuit lengths for various circuit breaker 
amperages are shown below. Breaker sizing should be 
based on the National Electrical Code, Canadian Electrical 
Code 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. 
Catalog Number 
120 Vac Nominal 
Catalog Number 
240 Vac Nominal 
Power Output 
at 50°F (10°C) 
w/ft (m) 
VSX 5-1 VSX 5-2 5 (16) 
VSX 10-1 VSX 10-2 10 (33) 
VSX 15-1 VSX 15-2 15 (49) 
VSX 20-1 VSX 20-2 20 (66) 
20 
(66) 
15 
(49) 
5 
(16) 
VSX 15 
CERTIFICATIONS/APPROVALS 
FM Approvals 
Ordinary Locations 
Hazardous (Classified) Locations 
Class I, Division 2, Groups B, C and D 
Class II, Division 2, Groups F and G 
Class III, Divisions 1 and 2 
Class I, Zones 1 and 2, AExe II 
Underwriters Laboratories Inc. 
Ordinary Locations 
Hazardous (Classified) Locations 
Class I, Division 2, Groups A, B, C and D 
Class II, Division 2, Groups F and G 
Class III, Divisions 1 and 2 
Class I, Zones 1 and 2, AExe II 
Canadian Standards Association 
Ordinary Locations 
Hazardous (Classified) Locations 
Class I, Division 1, Groups A, B, C and D 
Class II, Division 1, Groups E, F and G 
Class I, Division 2, Groups A, B, C and D 
Class II, Division 2, Groups E, F and G 
Ex e II 
Notes 
1. For more precise power output values as a function of pipe temperature, refer to 
CompuTrace®. 
2. Based on the trip current characteristic of Type QOB or Type QO equipment 
protection devices. For devices with other trip current characteristics, contact 
Thermon. 
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. 
120 Vac Service Voltage Max. Circuit Length 3 vs. Breaker Size 
Catalog Start-Up 
ft (m) 
Number 
Temperature 
°F (°C) 20A 30A 40A 50A 
VSX 5-1 
50 (10) 205 (63) 335 (102) 335 (102) 335 (102) 
0 (-18) 205 (63) 335 (102) 335 (102) 335 (102) 
-20 (-29) 195 (60) 335 (102) 335 (102) 335 (102) 
-40 (-40) 185 (56) 315 (97) 335 (102) 335 (102) 
VSX 10-1 
50 (10) 135 (41) 220 (66) 265 (80) 265 (80) 
0 (-18) 135 (41) 220 (66) 265 (80) 265 (80) 
-20 (-29) 125 (38) 210 (63) 265 (80) 265 (80) 
-40 (-40) 115 (36) 190 (58) 265 (80) 265 (80) 
VSX 15-1 
50 (10) 100 (30) 160 (48) 235 (71) 235 (71) 
0 (-18) 100 (30) 160 (48) 235 (71 235 (71) 
-20 (-29) 95 (29) 155 (47) 230 (70) 235 (71) 
-40 (-40) 90 (27) 145 (44) 215 (65) 225 (69) 
VSX 20-1 
50 (10) 70 (21) 105 (32) 150 (45) 200 (62) 
0 (-18) 60 (18) 90 (28) 125 (39) 170 (52) 
-20 (-29) 55 (17) 85 (26) 120 (36) 160 (48) 
-40 (-40) 50 (16) 80 (25) 110 (34) 150 (45) 
120 Vac Service Voltage Max. Circuit Length 3 vs. Breaker Size 
ft (m) 
Catalog 
Number 
Start-Up 
Temperature 
°F (°C) 20A 30A 40A 50A 
VSX 5-2 
50 (10) 415 (126) 685 (209) 685 (209) 685 (209) 
0 (-18) 415 (126) 685 (209) 685 (209) 685 (209) 
-20 (-29) 395 (120) 685 (209) 685 (209) 685 (209) 
-40 (-40) 365 (112) 630 (193) 685 (209) 685 (209) 
VSX 10-2 
50 (10) 270 (82) 435 (133) 565 (172) 565 (172) 
0 (-18) 255 (78) 420 (128) 565 (172) 565 (172) 
-20 (-29) 235 (72) 385 (117) 565 (172) 565 (172) 
-40 (-40) 220 (66) 350 (107) 535 (163) 565 (172) 
VSX 15-2 
50 (10) 200 (61) 315 (97) 465 (142) 530 (161) 
0 (-18) 175 (53) 275 (84) 405 (123) 525 (161) 
-20 (-29) 165 (50) 260 (79) 375 (115) 485 (148) 
-40 (-40) 155 (48) 245 (75) 355 (108) 450 (138) 
VSX 20-2 
50 (10) 145 (45) 230 (70) 325 (99) 405 (124) 
0 (-18) 125 (39) 195 (60) 275 (84) 375 (114) 
-20 (-29) 120 (37) 185 (56) 260 (79) 350 (106) 
-40 (-40) 115 (34) 175 (53) 245 (75) 325 (100) 
Watts per Foot (W/m) 
10 
(33) 
Pipe Temperature °F (°C) 
VSX 20 
VSX 5 
0 
VSX 10 
50 
(10) 
250 
(121) 
200 
(93) 
150 
(66) 
100 
(38) 
300 
(149)

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Thermon VSX Heat Tracing Cable - Spec Sheet

  • 1. PRODUCT SPECIFICATIONS VSX™ SELF-REGULATING HEATING CABLE CONSTRUCTION 1 Nickel-plated copper bus wires (14 AWG) 2 Semiconductive heating matrix and fluoropolymer dielectric insulation 3 Nickel-plated copper braid 4 Fluoropolymer overjacket provides additional protection for cable and braid where exposure to chemicals or corrosives is expected. BASIC ACCESSORIES Thermon offers system accessories designed specifically for rapid, trouble-free installation of Thermon heating cables. All cables require a connection kit to comply with approval requirements. Information on accessories to complete a heater circuit installation can be found in the “Heating Cable Systems Accessories” product specification sheet (Form TEP0010). APPLICATION High performance VSX self-regulating heating cables are designed specifically for process temperature maintenance or freeze protection applications where high maintain temperatures or high temperature exposure is required. The heat output of VSX cable varies in response to the surrounding temperature by reducing its thermal output with increasing temperature. With its high self-regulating characteristic, VSX can be installed in hazardous areas requiring a T3 temperature class rating. VSX cables are approved for use in ordinary (nonclassified) areas, hazardous (classified) areas, and Zone 1 and 2 classified areas. RATINGS Available watt densities............. 5, 10, 15, 20 w/ft @ 50°F (16, 33, 49, 66 w/m @ 10°C) Supply voltages...........................110-120 or 208-277 Vac Max. maintenance temperature..................300°F (149°C) Max. exposure temperature) Intermittent power-on.............................450°F (232°C) Intermittent power-off.............................482°F (250°C) Continuous power-off.............................400°F (204°C) Minimum installation temperature............... -60°F (-51°C) Minimum bend radius @ 5°F (-15°C)......................................... 0.38” (10mm) @ -76°F (-60°C).................................... 1.25” (32 mm) T-rating 1................................................T3 392°F (200°C) Notes 1. T-rating per the National Electrical Code and Canadian Electrical Code. 1 2 3 4 THERMON The Heat Tracing Specialists® 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 Form TEP0008-0714 • © Thermon Manufacturing Co. • Printed in U.S.A. • Information subject to change.
  • 2. PRODUCT SPECIFICATIONS VSX™ SELF-REGULATING HEATING CABLE POWER OUTPUT CURVES 1 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. CIRCUIT BREAKER SIZING 2 Maximum circuit lengths for various circuit breaker amperages are shown below. Breaker sizing should be based on the National Electrical Code, Canadian Electrical Code 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. Catalog Number 120 Vac Nominal Catalog Number 240 Vac Nominal Power Output at 50°F (10°C) w/ft (m) VSX 5-1 VSX 5-2 5 (16) VSX 10-1 VSX 10-2 10 (33) VSX 15-1 VSX 15-2 15 (49) VSX 20-1 VSX 20-2 20 (66) 20 (66) 15 (49) 5 (16) VSX 15 CERTIFICATIONS/APPROVALS FM Approvals Ordinary Locations Hazardous (Classified) Locations Class I, Division 2, Groups B, C and D Class II, Division 2, Groups F and G Class III, Divisions 1 and 2 Class I, Zones 1 and 2, AExe II Underwriters Laboratories Inc. Ordinary Locations Hazardous (Classified) Locations Class I, Division 2, Groups A, B, C and D Class II, Division 2, Groups F and G Class III, Divisions 1 and 2 Class I, Zones 1 and 2, AExe II Canadian Standards Association Ordinary Locations Hazardous (Classified) Locations Class I, Division 1, Groups A, B, C and D Class II, Division 1, Groups E, F and G Class I, Division 2, Groups A, B, C and D Class II, Division 2, Groups E, F and G Ex e II Notes 1. For more precise power output values as a function of pipe temperature, refer to CompuTrace®. 2. Based on the trip current characteristic of Type QOB or Type QO equipment protection devices. For devices with other trip current characteristics, contact Thermon. 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. 120 Vac Service Voltage Max. Circuit Length 3 vs. Breaker Size Catalog Start-Up ft (m) Number Temperature °F (°C) 20A 30A 40A 50A VSX 5-1 50 (10) 205 (63) 335 (102) 335 (102) 335 (102) 0 (-18) 205 (63) 335 (102) 335 (102) 335 (102) -20 (-29) 195 (60) 335 (102) 335 (102) 335 (102) -40 (-40) 185 (56) 315 (97) 335 (102) 335 (102) VSX 10-1 50 (10) 135 (41) 220 (66) 265 (80) 265 (80) 0 (-18) 135 (41) 220 (66) 265 (80) 265 (80) -20 (-29) 125 (38) 210 (63) 265 (80) 265 (80) -40 (-40) 115 (36) 190 (58) 265 (80) 265 (80) VSX 15-1 50 (10) 100 (30) 160 (48) 235 (71) 235 (71) 0 (-18) 100 (30) 160 (48) 235 (71 235 (71) -20 (-29) 95 (29) 155 (47) 230 (70) 235 (71) -40 (-40) 90 (27) 145 (44) 215 (65) 225 (69) VSX 20-1 50 (10) 70 (21) 105 (32) 150 (45) 200 (62) 0 (-18) 60 (18) 90 (28) 125 (39) 170 (52) -20 (-29) 55 (17) 85 (26) 120 (36) 160 (48) -40 (-40) 50 (16) 80 (25) 110 (34) 150 (45) 120 Vac Service Voltage Max. Circuit Length 3 vs. Breaker Size ft (m) Catalog Number Start-Up Temperature °F (°C) 20A 30A 40A 50A VSX 5-2 50 (10) 415 (126) 685 (209) 685 (209) 685 (209) 0 (-18) 415 (126) 685 (209) 685 (209) 685 (209) -20 (-29) 395 (120) 685 (209) 685 (209) 685 (209) -40 (-40) 365 (112) 630 (193) 685 (209) 685 (209) VSX 10-2 50 (10) 270 (82) 435 (133) 565 (172) 565 (172) 0 (-18) 255 (78) 420 (128) 565 (172) 565 (172) -20 (-29) 235 (72) 385 (117) 565 (172) 565 (172) -40 (-40) 220 (66) 350 (107) 535 (163) 565 (172) VSX 15-2 50 (10) 200 (61) 315 (97) 465 (142) 530 (161) 0 (-18) 175 (53) 275 (84) 405 (123) 525 (161) -20 (-29) 165 (50) 260 (79) 375 (115) 485 (148) -40 (-40) 155 (48) 245 (75) 355 (108) 450 (138) VSX 20-2 50 (10) 145 (45) 230 (70) 325 (99) 405 (124) 0 (-18) 125 (39) 195 (60) 275 (84) 375 (114) -20 (-29) 120 (37) 185 (56) 260 (79) 350 (106) -40 (-40) 115 (34) 175 (53) 245 (75) 325 (100) Watts per Foot (W/m) 10 (33) Pipe Temperature °F (°C) VSX 20 VSX 5 0 VSX 10 50 (10) 250 (121) 200 (93) 150 (66) 100 (38) 300 (149)