Chromalox SRP Catalog Page
SRP
Self-Regulating
Process Temperatures
• Self- Regulating, Energy
Efcient
• 16 AWG Buss Wire
• Circuit Lengths to 750 ft.
• Process Temperature
Maintenance to 230°F (110°C)
Heating Cable
E C B A
Cut to Length
in Field
Can be Single
Overlapped
D
Maintains up to
230°F
Withstands up to
275°F
Low Tempera-
ture
Output
Temperature
Self Regulating
Output
• Maximum Continuous Exposure
Temperature, Power Off, 275°F
(135°C)
• Available in 5, 10, and 15 Watts
per Foot
• 120 and 208-277 Volts Available
from Stock
• Industrial Process Maintenance
Applications
• Approximate Size 3/8"W x 1/8"H
• Min. Bend Radius 1-1/8"
• For use on Metallic Pipes
• Consult Facotory for use on
Plastic Piping
Description
Chromalox SRP self-regulating heating cable
provides safe, reliable heat tracing for process
maintenance applications to 230°F (110°C)
or freeze protection of pipes / tank with high
heat losses. Constructed of industrial grade
16 AWG buss wire with a tinned copper braid
and optional overjacketing, SRP ensures
operating integrity most hostile industrial
environments.
Features
• Energy efficient, self-regulating SRP uses
less energy when less heat is required.
• Easy to install, SRP can be cut to any length
(up to max circuit length) in the field.
• SRP features lower installed cost than steam
tracing, less maintenance expense and less
down time.
• SRP can be single overlapped without burnout, which simplifies heat tracing of in-line
process equipment such as valves, elbows
and pumps.
• Because SRP is self-regulating, overtemperature conditions are minimized.
• Chromalox U-Series Connection Kits reduce
installation time.
Construction
A
Twin 16 AWG Copper Buss Wires – Pro-
vide reliable electric current capability.
B
Semiconductive Polymer Core Matrix
“Self-Regulating” component of the
cable its electrical resistance varies with
temperature. As process temperature
drops,the core’s heat output increases; as
process temperature rises, the heat output
decreases.
C
Fluoropolymer Jacket – Flame retardant,
electrically insulates the matrix and buss
wires and provides corrosion resistance.
D
Tinned Copper Braid – Provides addition-
al mechanical protection in any environment and a positive ground path.
E
High Temperature Fluoropolymer
Overjacket – Corrosion resistant, flame
retardant overjacket is highly effective
in many environments. Protects against
exposure to organic or corrosive solutions. The overjacket also protects against
abrasion and impact damage.
Approvals
Factory Mutual (FM) approved for ordinary
areas. FM approved for hazardous (classified) areas when used with U Series and DL
accessories
FM Approved:
• Class I, Division 2, Groups B, C, D (Gases,
vapors)
• Class II, Divisions 1*&2, Groups F, G
(Comubustible dust)
• Class III, Division 2
(Easily ignitable fibers and fillings)
• Class I, Zone 1, AEx e II
• 3,5,8 and 10 Watt Rated T4
Temperature Class
SELF-REGULATING
WARNING — A ground fault protection device
is required by NEC to minimize the danger of
fire if the heating cable is damaged or improperly installed. A minimum trip level of 30mA is
recommended to minimize nuisance tripping.
G-13
Heating Cable
SRP
Self-Regulating
Process Temperatures
(cont’d.)
Thermal Output Ratings on Insulated Metal Pipes
21
20
19
18
17
16
15
14
13
12
11
10
9
8
Heat Output (W/Ft.)
7
6
5
4
3
2
Cable Output vs.
1
Temperature
5 W/Ft.
15 W/Ft.
10 W/Ft.
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230
Pipe Temperature (°F)
Note 1 — Thermal output is determined per IEEE 515-2011 Standard for testing, design,
installation and maintenance of electrical resistance heat tracing section 4.1.11
Method C.
Output Wattage at Alternate Voltages (W/Ft.)
Model 208V
SRP 5 3.85 -20 4.25 -13 6.45 +15
SRP 10 8.3 -18 8.80 -10 12.50 +13
SRP 15 12.75 -14 13.50 -9 18.45 +12
% Change
In Output 220V
% Change
In Output 277V
% Change
In Output
Circuit Breaker Selection (Max. Circuit Lengths in Ft.)
Cable
Rating
SRP5-1CT 145 195 295 390 490 110 145 215 295 360 70 90 135 180 225
SRP5-2CT 295 385 580 750 750 220 290 430 580 720 135 180 270 360 450
SRP10-1CT 100 135 200 270 330 70 95 145 190 240 65 85 130 175 215
SRP10-2CT 200 270 400 530 665 145 190 290 380 480 130 175 260 350 440
SRP15-1CT 75 100 150 200 250 60 80 120 160 200 55 70 110 145 180
SRP15-2CT 150 195 295 390 500 120 160 235 320 400 110 145 220 290 360
NR = Not Required. Maximum circuit length has been reached in a smaller breaker size.
15A 20A 30A 40A 50A 15A 20A 30A 40A 50A 15A 20A 30A 40A 50A
50°F Start-Up (Ft.) 0°F Start-Up (Ft.) -20°F Start-Up (Ft.)
G-14
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