Chromalox CWM Catalog Page
Heating Cable
CWM
Constant Wattage
Medium Temperature
• Uniform Thermal Output, Low
Energy Cost
• No Inrush at Any Ambient
• Industrial/Process and
Commercial/Construction
Applications
• Maximum Exposure
Temperature, Power Off, 392°F
(200°C)
• Steam Cleanable on Process
Equipment Up to 190 PSIG
(Power Off)
• 4, 8 and 12 W/Ft.
• 120, 208 - 277 and 480 Volt
From Stock
• Approximate Size 1/4"W x 1/8"H
• Minimum Bend Radius 1-1/4"
• For Use on Metallic Pipes
• Consult Factory for Use on
Plastic Pipes
Description
Chromalox CWM constant wattage heating cable is a proven, reliable solution for
industrial process temperature maintenance
and freeze protection. CWM features a parallel
heating core that produces uniform thermal
output over its entire length. Using a single
power point, you can easily configure and
install a heat tracing system as short as
several feet or as long as 780 feet right in
the field. With 392°F (200°C) fluoropolymer
electrical insulation over-jacketing, CWM has
outstanding electrical and thermal properties,
and is well suited for most chemically hostile
environments.
G
F
D
Maintains up to
B
CE
320°F
Withstands up to
392°F
Cut to Length
in Field
Note — Consult maximum maintenance temperature chart on page G-23
for allowable watt densities.
Medium Tem-
perature
Output
Temperature
Constant Watt-
age Output
Features
• Durable, non-aging fluoropolymer jacket
ensures long service life and can be used in
some hostile environments.
• Flexible, easy to install on most equipment
and delivers long-term reliable performance.
• Eliminates the need for oversized wiring or
switchgear.
• Accurate temperature, reliable electric heat
that can be consistently controlled and easily
monitored.
• Safe and rugged.
• Parallel circuitry allows cut-to-length.
• High performance, rated to withstand up
to 392°F saturated steam (190 psig) temperature (power off).
• Low profile, uses standard size thermal
insulation on piping and process
equipment
.
Construction
A
Twin 12 AWG Copper Buss Wires —
Provide reliable, consistent electrical
current.
B
FEP Insulation Jacket — Electrically
insulates buss wires.
C
Pairing Jacket — Secures two buss wires
together and provides wrapping surface
for Nichrome wire.
D
Nickel Chromium Wire — Heating
component of the cable.
E
FEP Insulation — Rugged outer sheath
protects heating cable, assures longer
service life, and provides protection
against environmental application hazards.
F
Tinned Copper Braid — Plated copper
braid increases robust construction,
provides ground path and provides
additional protection in any location.
Suffix “C” in model number.
G
FEP Overjacket (optional) —
Fluoropolymer overjacket, over the braid,
provides protection from most aqueous
and chemically corrosive solutions. Suffix
“T” in model number.
Approvals
UL Listed for ordinary areas.
CSA Certified for ordinary and:
• Class I, Div. 2, Groups A, B, C, D
• Class II, Div. 2, Groups F, G. Rated T3 Tem-
perature Class
Notes —
1. Depends on specific model.
2. Exception: Cable surface temperature shall
not exceed 190°C in Class II, Div. 2, Group
F; 165°C in Class II, Div. 2, Group G.
1
2
.
A
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-22
CWM
Constant Wattage Medium
Temperature (cont’d.)
Specifications
Heating Cable
Model
CWM 4-1CT
CWM 8-1CT
CWM 12-1CT
CWM 4-2CT
CWM 8-2CT
CWM 12-2CT
CWM 12-4CT 12 480 0.025 780
Output
(W/Ft.)
4
8
12
4
8
12
Nominal
Voltage
(Vac)
120
120
120
240
240
240
Circuit Load
(Amps/Ft.)
0.033
0.067
0.100
0.017
0.033
0.050
Max.
Circuit Length
(Ft.)
350
240
200
700
480
400
Output Wattage at Various Operating Voltages (Ft.)
Model 120V 208V 220V 240V 277V 480V
CWM 12-1
CWM 8-1
CWM 4-1
CWM 12-2
CWM 8-2
CWM 4-2
CWM 12-4 — 2.3 2.5 3 4 12
12
—
8
4
3
2
—
—
—
9
6
3
—
—
—
10.1
6.7
3.4
12
—
—
—
8
4
—
—
—
—
—
—
Maximum Allowable Pipe Maintenance Temperature with Power On
Output
(W/Ft.)
w/o AT-1 Tape 340 325 293 282 262 246 229 222 200
w/ AT-1 Tape 350 344 332 328 320 314 307 304 296
3 4 6 6.7 8 9 10.1 10.6 12
Temperatures (°F)
—
—
—
—
—
—
WATTAGE
CONSTANT
G-23
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